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Institute
- Physik (3410) (remove)
Proteomic profiles of myocardial tissue in two different etiologies of heart failure were investigated using high performance liquid chromatography (HPLC)/Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Right atrial appendages from 10 patients with hemodynamically significant isolated aortic valve disease and from 10 patients with isolated symptomatic coronary heart disease were collected during elective cardiac surgery. As presented in an earlier study by our group (Baykut et al., 2006), both disease forms showed clearly different pattern distribution characteristics. Interesting enough, the classification patterns could be used for correctly sorting unknown test samples in their correct categories. However, in order to fully exploit and also validate these findings there is a definite need for unambiguous identification of the differences between different etiologies at molecular level. In this study, samples representative for the aortic valve disease and coronary heart disease were prepared, tryptically digested, and analyzed using an FT-ICR MS that allowed collision-induced dissociation (CID) of selected classifier masses. By using the fragment spectra, proteins were identified by database searches. For comparison and further validation, classifier masses were also fragmented and analyzed using HPLC-/Matrix-assisted laser desorption ionization (MALDI) time-of-flight/time-of-flight (TOF/TOF) mass spectrometry. Desmin and lumican precursor were examples of proteins found in aortic samples at higher abundances than in coronary samples. Similarly, adenylate kinase isoenzyme was found in coronary samples at a higher abundance. The described methodology could also be feasible in search for specific biomarkers in plasma or serum for diagnostic purposes.
We study electron transport through a single-molecule magnet (SMM) and the interplay of its anisotropic spin with quantized vibrational distortions of the molecule. Based on numerical renormalization group calculations we show that, despite the longitudinal anisotropy barrier and small transverse anisotropy, vibrational fluctuations can induce quantum spin-tunneling (QST) and a QST-Kondo effect. The interplay of spin scattering, QST and molecular vibrations can strongly enhance the Kondo effect and induce an anomalous magnetic field dependence of vibrational Kondo side-bands.
Directed deposition of silicon nanowires using neopentasilane as precursor and gold as catalyst
(2012)
In this work the applicability of neopentasilane (Si(SiH3)4) as a precursor for the formation of silicon nanowires by using gold nanoparticles as a catalyst has been explored. The growth proceeds via the formation of liquid gold/silicon alloy droplets, which excrete the silicon nanowires upon continued decomposition of the precursor. This mechanism determines the diameter of the Si nanowires. Different sources for the gold nanoparticles have been tested: the spontaneous dewetting of gold films, thermally annealed gold films, deposition of preformed gold nanoparticles, and the use of “liquid bright gold”, a material historically used for the gilding of porcelain and glass. The latter does not only form gold nanoparticles when deposited as a thin film and thermally annealed, but can also be patterned by using UV irradiation, providing access to laterally structured layers of silicon nanowires.
We compute the phase and the modulus of an energy- and pressure-free, composite, adjoint, and
inert field φ in an SU(2) Yang-Mills theory at large temperatures. This field is physically relevant in describing part of the ground-state structure and the quasiparticle masses of excitations. The field φ possesses nontrivial S1-winding on the group manifold S3. Even at asymptotically high temperatures, where the theory reaches its Stefan-Boltzmann limit, the field φ, though strongly power suppressed, is conceptually relevant: its presence resolves the infrared problem of thermal perturbation theory.
The main purpose of the Transition Radiation Detector (TRD) located in the central barrel of ALICE (A Large Ion Collider Experiment) is electron identification for separation from pions at momenta pt > 1 GeV/c, since in this momentum range the measurements of the specific energy loss (dE/dx) of the Time Projection Chamber (TPC) is no longer sufficient. Furthermore, it provides a fast trigger for high transverse momentum charged particles (pt > 3 GeV/c) and makes a significant contribution to the optimization of the tracking of reaction products in heavy-ion collisions. Its whole setup comprises 18 supermodules out of which 13 are presently operational and mounted cylindrically around the beam axis of the Large Hadron Collider (LHC). A supermodule contains either 30 or 24 chambers, each consisting of a radiator for transition radiation creation, a drift and an amplifying region followed by the read-out electronics. In total, the TRD is an array of 522 chambers operated with about 28 m3 of a Xe-CO2 [85-15%] gas mixture. During the work of this thesis, the testing, commissioning, operation and maintenance of detector parts, the gas system and its online quality monitor, improvements on the detector control user-interface and studies about a new pre-trigger module for data read-out have been accomplished. The TRD gas system mixes, distributes and circulates the operational gas mixture through the detector. Its overall optimization has been achieved by minimizing gas leakage, surveying, controlling, maintaining and continuously improving it as well as designing and carrying out upgrades. Gas quality monitors of the type \GOOFIE" (Gas prOportional cOunter For drIfting Electrons) can be used in gaseous detectors as on-line monitors of the electron drift velocity, gain and gas properties. One of these devices has been implemented within the TRD gas system, while another one surveys the gas of the TPC. Both devices had to be adapted to the specific needs of the detectors, were under constant surveillance and control, and needed to be further developed on both hardware and software side. To improve the operation of the TRD, modifications on its DCS software (Detector Control System) used for monitoring, controlling, operating, regulating and configuring of hardware and computing devices have been carried out. The DCS is designed to enable an operator to interact with equipment through user interfaces that display the information from the system. The main focus of this work was laid on the optimization of the usability and design of the user interface. The front-end electronics of the TRD require an early start signal (\pre-trigger") from the fast forward detectors or the Time-Of-Flight detector during the running periods. The realization of a new hardware concept for the read-out of the TRD pre-trigger system has been studied and first tests were performed. This new module called PIMDDL (Pre-trigger Interface Module Detector Data Link) is meant to acquire all data necessary to simulate and predict the full pre-trigger functionality, and to verify its proper operation. Furthermore, it shall provide all functionalities of the so-called Control Box Bottom as well as keep the functionalities of the already existing PIM (Pre-trigger Interface Module) in order to combine and replace these two modules in the future.
Zellulare Nichtlineare Netzwerke bzw. Zellulare Neuronale Netzwerke, sogenannte CNN, wurden 1988 von L.O. Chua und L.Yang eingeführt und seither intensiv untersucht. Diese sind als Simulations-Software und als schaltungstechnische Realisierungen, in Hardware, verfügbar.
Als analog arbeitende Hardware Schaltungen können diese Netzwerke erhebliche Rechenleistungen erzielen.
Durch ihren Aufbau ermöglichen sie eine parallele Daten- und Signalverarbeitung.
Eine Einführung in CNN wird gegeben und das EyeRIS 1.1 Systems des Unternehmens ANAFOCUS Ltd. vorgestellt.
Das EyeRIS 1.1 System ist mit einem analog arbeitenden Focal Plane Prozessor (FPP) und einem digitalen Prozessor ausgestattet, wobei der Focal Plane Prozessor auch als Kamera zur Aufnahme von Bildern und Bildsequenzen benutzt werden kann.
Dies ermöglicht es, analoge CNN-Algorithmen zusammen mit digitalen Algorithmen auf einem System zu implementieren und so die Vorteile beider Ansätze zu nutzen. Der Datenaustausch zwischen dem analogen und digitalem Teil des EyeRIS 1.1 Systems geschieht mittels digital/analog und analog/digital Wandlung. Es werden Algorithmen auf dem EyeRIS 1.1 System untersucht und mit Ergebnissen die mittels Simulationen erzeugt wurden verglichen.
In Voruntersuchungen werden die Darstellungsgenauigkeit von Werten im analogen Teil des EyeRIS 1.1 Systems und die Verarbeitungsgeschwindigkeiten des EyeRIS 1.1 Systems untersucht.
Im Weiteren wird besonderes Augenmerk auf medizinische und technische Anwendungsgebiete gelegt werden.
Im medizinischen Anwendungsbereich wird die Implementierung von Algorithmen zur Vorhersage epileptischer Anfälle untersucht.
Hierfür wird ein evolutionär motiviertes Optimierungsverfahren entwicklet und auf dem EyeRIS 1.1-System implementiert.
Hierbei werden Simulationen durchgeführt und mit Ergebnissen, die mittels Verwendung des EyeRIS 1.1 Systems erlangt wurden, verglichen.
Ein zweites Verfahren geht die Signalanalyse für die Vorhersage auf dem EyeRIS 1.1-System mittels Mustererkennung an.
Das Mustererkennungsverfahren wird eingehend beschrieben sowie die hierbei zu beachtenden Randbedingungen erläutert.
Die Ergebnisse zeigen, daß Algorithmen zur Vorhersage von epileptischen Anfällen auf schaltungstechnichen Realisierungen von CNN implementiert werden können.
Im technischen Bereich wird die Anwendbarkeit auf die Problemstellung der Bildverarbeitung gelegt und die Möglichkeit von CNN basierten Algorithmen zur Erkennung von Prozessparametern bei Laserschweißverfahren untersucht. Ein solcher Prozessparameter ist das sogenannte Key-Hole, welches in Bildsequenzen von Laserschweißprozessen als ein Maß für die zu erwartende Qualität einer Schweißnaht herangezogen werden kann. Ein CNN basierter Algorithmus für die Erkennung solcher Key-Holes wird in dieser Arbeit vorgestellt und untersucht.
Für die Überwachung eines Laserschweißverfahrens wird der entwickelte Algorithmius und seine Funktionsweise beschrieben.
Dieser wird in Teilalgorithmen auf die analog bzw. digital arbeitenden Komponenten des EyeRIS 1.1 Systems verteilt.
Die Teilalgorithmen und die möglichen Aufteilungen und deren Laufzeitverhalten werden beschrieben und untersucht.
Die Ergebnisse der Untersuchung zeigen, daß eine Prozessüberwachung mittels CNN möglich ist und heben die Vorteile hervor, welche die Bildaufnahme und -verarbeitung mittels analoger CNN-Hardware bietet.
Eine Untersuchung des Laufzeitverhaltens auf Grafikkarten Prozessoren (GPU's) wird im Anhang vorgestellt.
Quarkonia are very promising probes to study the quark-gluon plasma. The essential baseline for measurements in heavy-ion collisions is high-precision data from proton-proton interactions. However, the basic mechanisms of quarkonium hadroproduction are still being debated. The most common models, the Color-Singlet Model, the non-relativistic QCD approach and the Color-Evaporation Model, are able to describe most of the available cross-section data, despite of their conceptual differences. New measures, such as the polarization, and data at a new energy regime are crucial to test the competing models. Another issue is an eventual interplay between the production process of a quarkonium state and the surrounding pp event. Current Monte Carlo event generators treat the hard scattering independently from the rest of the so-called underlying event. The investigation of possible correlations with the pp event might be very valuable for a detailed understanding of the production processes. ALICE ist the dedicated heavy-ion experiment at the LHC. Its design has been optimized for high-precision measurements in very high track densities and down to low transverse momenta. ALICE is composed of various different detectors at forward and at central rapidities. The most important detectors for this study are the Inner Tracking System and the Time Projection Chamber, allowing to reconstruct and identify electron candidate tracks within eta < 0.9. The Transition Radiation Detector has not been utilized at this stage of the analysis; however, it will strongly improve the particle identification and provide a dedicated trigger in the upcoming beam periods. ...
The intriguing effects of electroweak induced parity violation (PV) in molecules have yet to be observed, but experiments on molecular PV promise to provide fascinating insights. They potentially offer a novel testing ground for the low energy sector of the standard model and, in addition, a successful measurement of PV differences between the two enantiomers of a chiral molecule could promote a deeper understanding of molecular chirality, by essentially establishing a new link between particle physics and biochemistry. A key challenge in the design of such experiments is the identification of suitable molecules, which in turn requires widely applicable computational schemes for the prediction of PV experimental signals. To this end, a quasirelativistic density functional theory approach to the calculation of PV effects in nuclear magnetic resonance (NMR) spectra of chiral molecules has been developed and implemented during the course of this thesis. It includes relativistic as well as electron--correlation effects and has been used extensively in the screening of molecules possibly suited for a first observation of molecular PV. Some relevant compound classes have been identified, but none of their selected representatives are predicted to exhibit PV NMR frequency shifts that can be detected under current experimental restrictions. In order to advance the design of molecules which exhibit particularly large PV signals in experiments, systematic effects on PV NMR frequency splittings such as scaling with nuclear charge, conformational dependence and the impact of atomic substitution around the NMR active nucleus have been studied. Previously predicted scaling laws were confirmed and it was determined that the environment of the NMR active nucleus, both in terms of conformation and atomic composition, can be tuned to increase PV frequency shifts by several orders of magnitude. In addition to molecules suited for NMR experiments, a fascinating chiral actinide compound was studied with regard to PV frequency shifts in vibrational spectra. This compound displays the largest such shift ever predicted for an existing molecule, which lies well within the attainable experimental resolution. The challenge now lies in making it compatible with current experimental setups.
In den letzten Jahren haben die Forschungsaktivitäten im Bereich Thermoelektrik stetig zugenommen. Das neu erweckte Interesse an der Thermoelektrik ist zurückzuführen auf neue nanostrukturierte Materialien, Quantenschicht-Strukturen und Nanodrähte, welche
eine wesentliche Steigerung der thermoelektrischen Effektivität Z im Vergleich zum Massivmaterial versprechen. Für Nanodrähte ist die größte Steigerung der thermoelektrischen Effektivität zu erwarten. Zur Bestätigung der Theorie bedarf es neuer Messmethoden zur Bestimmung des Seebeck-Koeffizienten S, der elektrischen Leitfähigkeit σ und der Wärmeleitfähigkeit λ, um hieraus eine Steigerung der thermoelektrischen Effektivität Z = (Sexp2)σ/λ experimentell zu bestätigen.
Der Schwerpunkt der Doktorarbeit lag in der Untersuchung thermoelektrischer Eigenschaften von Nanodrähten. Hierzu wurden neueMessmethoden zur Bestimmung der elektrischen und thermischen Leitfähigkeit von Nanodrähten entwickelt.
Die elektrische und thermische Leitfähigkeit von Pt-Nanodrähten wurden mit dem in dieser Arbeit entwickelten λ-Chip gemessen. Die elektrische Leitfähigkeit der Pt-Nanodrähte ist im Vergleich zum Massivmaterial entsprechend der klassischen Size-Effekt-Theorie reduziert. Ebenso wurde eine Abnahme der Wärmeleitfähigkeit beobachtet. Die Ergebnisse stimmen mit den im Rahmen der klassischen Size-Effekt-Theorie zu erwartenden Resultaten gut überein, jedoch bedarf die Reduzierung der Lorenz-Zahl noch einer theoretischen Erklärung.
Im Weiteren wurde die elektrische Leitfähigkeit von BixTe1-x und BixSb1-x-Nanodrähten mit dem λ-Chip bestimmt. Hierzu wurden zunächst unterschiedliche Kontaktmaterialien getestet, um die Diffusion des Kontaktmaterials in den Nanodraht auszuschließen. Als bewährtes Kontaktmaterial stellte sich ein Schichtsystem aus Titan und Gold heraus. Die Ti-Schicht wirkt hierbei als Diffusionsbarriere und Haftvermittler-Schicht. Die Wärmeleitfähigkeit der Bi-haltigen Nanodrähte konnte mit dem λ-Chip nicht gemessen werden, da die Unterätzung der Nanodrähte mittels reaktivem Ionenätzen die Nanodrähte angriff. Als Alternative können die Nanodrähte auf dem λ-Chip mit einem fokusierten Ionenstrahl unterätzt werden. Der Aufwand hierzu ist jedoch relativ hoch und diese Alternative wurde deshalb nicht weiter verfolgt. Als weitere Alternative wurde der Z-Chip entwickelt. Hierbei werden die Nanodrähte auf den fertigen Chip aufgebracht und mittels Elektronenstrahl-induzierter Deposition an den elektrischen Kontakten fixiert. Der Chip ermöglicht die Messung der elektrische Leitfähigkeit in 4-Punkt-Anordnung, der Wärmeleitfähigkeit und des Seebeck-Koeffizienten an
einem einzelnen Nanodraht. Somit ist die Bestimmung der thermoelektrischen Effektivität an einem Nanodraht möglich. DesWeiteren wurden die theoretischen Grundlagen zur Bestimmung der Wärmekapazität an einzelnen Nanodrähten mit dem Z-Chip präsentiert. Zum Zeitpunkt der Durchführung dieser Arbeit fehlte jedoch das notwendige Equipment zur Ausführung der Wärmekapazitätsmessung an einzelnen Nanodrähten.
Des Weiteren wurde die Cross-Plane Methode zur Bestimmung der Wärmeleitfähigkeit an eingebetteten Nanodrähten entwickelt. Analog der Messmethode, welche für die Einzeldrahtmessungen verwendet wird, handelt es sich hierbei um eine stationäre „Joule-Heating“ Methode. Die Temperaturdifferenz wird aus der Widerstandsänderung einer auf die eingebetteten Nanodrähte aufgebrachten Heizschicht bestimmt.Mit derMethode wurde die Wärmeleitfähigkeit von BixTe1-x-Nanodrähten ermittelt.
Die elektrische Leitfähigkeit wurde von BixTe1-x-Nanodrähten unterschiedlicher Zusammensetzung und Herstellungsparameter mit dem λ- und dem Z-Chip bestimmt. Die gemessenen Nanodrähte zeigen sowohl intrinsisches wie extrinsisches Leitungsverhalten verbunden mit einer, im Vergleich zum Volumenmaterial, reduzierten Temperaturabhängigkeit der elektrischen Leitfähigkeit infolge von Oberflächen- und Korngrenzenstreuung der Ladungsträger. Die elektrischen Leitfähigkeitsmessungen stimmen mit Beobachtungen anderer Gruppen gut überein.
Die Wärmeleitfähigkeit konnte an einem einzelnen BixTe1-x-Nanodraht und an eingebetteten BixTe1-x-Nanodrähten gemessen werden. Die Wärmeleitfähigkeit ist gegenüber dem Massivmaterial reduziert. Die Ergebnisse sind in guter Übereinstimmung mit bisher publizierten Ergebnissen von Bismuttellurid-Nanodrähten.
In der modernen Festkörperphysik spielen elektronisch stark korrelierte Systeme mit ihrem komplexen Vielteilchenverhalten eine zentrale Rolle. Insbesondere das Wechselspiel zwischen thermischen und Quantenfluktuationen in den Ladungs- und Spinfreiheitsgraden führt zur Entstehung verschiedenster neuartiger Grundzustände.
Die vorliegende Dissertation „Ultrasonic and Magnetic Investigations in frustrated Lowdimensional Spin Systems“ beschäftigt sich mit den besonderen physikalischen Eigenschaften niedrig dimensionaler Spinsysteme. Diese Materialklasse, die auch zu den stark korrelierten Systemen zählt, wird seit vielen Jahren intensiv sowohl experimentell als auch theoretisch untersucht. Auf theoretischer Seite sind die niedrigdimensionalen Spinsysteme besonders interessant, da sie als Modellsysteme die exakte Beschreibung des Grundzustandes und des Anregungsspektrums ermöglichen. Von experimenteller Seite ist es in den letzten Jahrzehnten gelungen, verschiedenste Materialklassen niedrigdimensionaler Spinsysteme zu synthetisieren.
In der vorliegenden Arbeit werden die grundlegenden Theorien und physikalischen Konzepte niedrigdimensionaler Spinsysteme diskutiert. Insbesondere auch die Spin-Phonon-Wechselwirkung dieser Materialien, die für die hier beobachteten elastischen Anomalien verantwortlich ist. Weiterhin wird auch das elastische Verhalten bei magnetischen Phasenübergängen beschrieben.
Da die Ultraschallexperimente einen Schwerpunkt dieser Arbeit bilden, wird der Versuchsaufbau zur phasenempfindlichen Detektion von Schallgeschwindigkeit und Ultraschalldämfung ausführlich beschrieben. Diese Messmethode ist ideal zur Untersuchung der Spin-Phonon Wechselwirkung geeignet.
Spontaneous symmetry breaking is a general principle that constitutes the underlying concept of a vast number of physical phenomena ranging from ferromagnetism and superconductivity in condensed matter physics to the Higgs mechanism in the standard model of elementary particles. I focus on manifestations of spontaneously broken symmetries in systems that are not Lorentz invariant, which include both nonrelativistic systems as well as relativistic systems at nonzero density, providing a self-contained review of the properties of spontaneously broken symmetries specific to such theories. Topics covered include: (i) Introduction to the mathematics of spontaneous symmetry breaking and the Goldstone theorem. (ii) Minimization of Higgs-type potentials for higher-dimensional representations. (iii) Counting rules for Nambu–Goldstone bosons and their dispersion relations. (iv) Construction of effective Lagrangians. Specific examples in both relativistic and nonrelativistic physics are worked out in detail.
In this thesis, we have investigated strongly correlated bosonic gases in an optical lattice, mostly based on a bosonic version of dynamical mean field theory and its real-space extension. Emphasis is put on possible novel quantum phenomena of these many-body systems and their corresponding underlying physics, including quantum magnetism, pair-superfluidity, thermodynamics, many-body cooling, new quantum phases in the presence of long-range interactions, and excitational properties. Our motivation is to simulate manybody phenomena relevant to strongly correlated materials with ultracold lattice gases, which provide an excellent playground for investigating quantum systems with an unprecedented level of precision and controllability. Due to their high controllability, ultracold gases can be regarded as a quantum simulator of many-body systems in solid-state physics, high energy astrophysics, and quantum optics. In this thesis, specifically, we have explored possible novel quantum phases, thermodynamic properties, many-body cooling schemes, and the spectroscopy of strongly correlated many-body quantum systems. The results presented in this thesis provide theoretical benchmarks for exploring quantum magnetism in upcoming experiments, and an important step towards studying quantum phenomena of ultracold gases in the presence of long-range interactions.
The design, construction, and commissioning of the ALICE Time-Projection Chamber (TPC) is described. It is the main device for pattern recognition, tracking, and identification of charged particles in the ALICE experiment at the CERN LHC. The TPC is cylindrical in shape with a volume close to 90 m3 and is operated in a 0.5 T solenoidal magnetic field parallel to its axis.
In this paper we describe in detail the design considerations for this detector for operation in the extreme multiplicity environment of central Pb–Pb collisions at LHC energy. The implementation of the resulting requirements into hardware (field cage, read-out chambers, electronics), infrastructure (gas and cooling system, laser-calibration system), and software led to many technical innovations which are described along with a presentation of all the major components of the detector, as currently realized. We also report on the performance achieved after completion of the first round of stand-alone calibration runs and demonstrate results close to those specified in the TPC Technical Design Report.
This paper introduces a new methodology for the fabrication of strain-sensor elements for MEMS and NEMS applications based on the tunneling effect in nano-granular metals. The strain-sensor elements are prepared by the maskless lithography technique of focused electron-beam-induced deposition (FEBID) employing the precursor trimethylmethylcyclopentadienyl platinum [MeCpPt(Me)3]. We use a cantilever-based deflection technique to determine the sensitivity (gauge factor) of the sensor element. We find that its sensitivity depends on the electrical conductivity and can be continuously tuned, either by the thickness of the deposit or by electron-beam irradiation leading to a distinct maximum in the sensitivity. This maximum finds a theoretical rationale in recent advances in the understanding of electronic charge transport in nano-granular metals.
This thesis has light mesons and their vacuum interactions as its topic. In particular, the work examines the question where the scalar antiquark-quark states are found in the physical spectrum -- in the energy region below or above 1 GeV. Contrary to the naive expectation, the mentioned states are found in the region above 1 GeV. This has consequences for the building of order parameters for the chiral symmetry breaking of Quantum Chromodynamics (QCD).
P-type ATPases are membrane proteins acting as ion pumps that drive an active transport of cations across the membrane against a concentration gradient. The required energy for the ion transport is provided by binding and hydrolysis of ATP. A reaction mechanism of ion transport and energy transduction is assumed to be common for all P-type ATPases and generally described by the Post-Albers cycle. Transient currents and charge translocation of P-type ATPases were extensively investigated by electrical measurements that apply voltage jumps to initiate the reaction cycle. In this study, we simulate an applied voltage across the membrane by an electric field and perform electrostatic calculations in order to verify the experimentally-driven hypothesis that the energy transduction mechanism is regulated by specific structural elements. Side chain conformational and ionization changes induced by the electric field are evaluated for each transmembrane helix and the selectivity in response is qualitatively analyzed for the Ca2+-ATPase as well as for structural models of the Na+/K+-ATPase. Helix M5 responds with more conformer changes as compared to the other transmembrane helices what is even more emphasized when the stalk region is included. Thus our simulations support experimental results and indicate a crucial role for the highly conserved transmembrane helix M5 in the energy transduction mechanism of P-type ATPases.
Towards a THz Bloch laser
(2011)
The realisation of tunable THz laser sources working at room temperature would give
rise to further applications in this range of the electromagnetic spectrum. The THz
Bloch laser could therefore become the basis for a technological breakthrough. Beside
this practical relevance, the physics of the gain mechanism has been investigated
theoretically for a long time and the experimental implementation of a self-starting
laser still has not been achieved.
At the beginning of this thesis the basic principles of Bloch oscillations and the
related Bloch gain are described. The need of a superlattice structure to make Bloch
oscillations possible in a semiconductor material is discussed. In this context, the effect
of negative differential resistance and its influence on the field distribution due to Gunn
domains is explained. The latter lead to an inhomogeneous field which may suppress
the Bloch gain mechanism. The Krömer criterion is introduced and the concept of
field-pinning layers to improve the field homogeneity is deduced. Finally, the design of
the laser material is shown and different types of laser waveguides are compared.
In chapter 3 detailed recipes for the processing of samples are given. Different types of
contacts (ohmic and Schottky), the wafer bonding process required for double-metal
lasers and the application of different photoresists for different purposes are described.
An explanation of the formation of waveguides due to dry etching, wet etching
and ion implantation follows. Dry etching is an established technique in the field
of microstructure processing but the challenge of etching about 20 μm has led to
problems. The high etching depth also makes wet etching difficult but this method
could be improved due to a hard bake of the photoresist. The protection of critical
areas on the surface of the samples with photoresist during ion implantation was
increased by optimising the spin coating process. However, a full implantation of the
active layer between the waveguides was not achieved which was the reason for the
development of the hybrid technology. Here a prior wet etching of about 10 μm is
performed and the rest of the material is implanted.
The experimental setup is shown in chapter 4. An alternative method for the electrical
contacting with the help of a copper bar is introduced. This improves the current
distribution and the risk of an electrical breakdown during the measurements could
therefore be lowered. Devices for THz beam guidance and spectroscopic measurements
are shown and the method of biasing the samples with pulses below 100 ns and
determining the effective voltage applied to the sample is depicted. These short pulses
are required to prevent the samples heating up drastically due to high power.
Chapter 5 contains the current-voltage characterisation of several structures including
I-V-samples, Bloch laser samples and a quantum cascade laser. Different contacts
(ohmic and Schottky) and different techniques for the formation of the ridges have
been used in the processing of these samples (performed at the University of Frankfurt
in all cases) and their influence on the I-V-dependence is discussed. The properties of
the THz emission of the quantum cascade laser are in good agreement with published
results from lasers processed with the same material. Another important result of
this chapter is that the Bloch laser samples show unstable behaviour compared to the
quantum cascade structure even with short pulses (of about 10 ns) where the risk of an
electrical breakdown or the building of filaments is low. THz radiation emitted from
one of the Bloch laser samples could not be observed.
Two aspects that may have prevented the Bloch laser to emit are discussed in
chapter 6. The saturation of the gain for higher amplitudes of the THz wave is
investigated in single mode and multiple mode operation (the latter could occur due
to the Bloch gain being expected to be broadband). In both cases it is shown that
the saturation effect would limit the output power only to values clearly above the
detection limit. In the subsequent section the distribution of the electric field is
simulated with SILVACO software. Structures with transit layer lengths above the
Krömer criterion are compared with structures which include field-pinning layers. It is
shown that the latter are useful to avoid propagating Gunn domains as they build up
in similar structures without field-pinning layers. Nevertheless, the electric field inside
the superlattice regions is not stable. Beside spatial inhomogeneities also temporal
variations of the field magnitude are observed. The lack of a suitable field distribution
is expected to be the main reason for the samples not to work.
The subject of this thesis aimed at a better understanding of the spectacular X-ray burst. The most likely astrophysical site is a very dense neutron star, which accretes H/He-rich matter from a close companion. While falling towards the neutron star, the matter is heated up and a thermonuclear runaway is ignited. The exact description of this process is dominated by the properties of a few proton-rich radioactive isotopes, which have a low interaction probability, hence a high abundance.
The topic of this thesis was therefore an investigation of the short-lived, proton-rich isotopes 31Cl and 32Ar. The Coulomb dissociation method is the modern technique of choice. Excitations with energies up to 20 MeV can be induced by the Lorentz contracted Coulomb field of a lead target. At the GSI Helmholtzzentrum für Schwerionenforschung GmbH in Darmstadt, Germany, a Ar beam was accelerated to an energy of 825 AMeV and fragmented in a beryllium target. The fragment separator was used to select the desired isotopes with a remaining energy of 650 AMeV. They were subsequently directed onto a 208 Pb target in the ALAND/LAND setup. The measurement was performed in inverse kinematics. All reaction products were detected and inclusive and exclusive measurements of the respective Coulomb dissociation cross sections were possible.
During the analysis of the experiment, it was possible to extract the energy-differential excitation spectrum of 31Cl, and to constrain astrophysically important parameters for the time-reversed 30S(p,γ)31Cl reaction. A single resonance at 0.443(37) MeV dominates the stellar reaction rate, which was also deduced and compared to previous calculations.
The integrated Coulomb dissociation cross section of this resonance was determined to 15(6) mb. The astrophysically important one- and two-proton emission channels were analyzed for 32Ar and energy-differential excitation spectra could be derived. The integrated Coulomb dissociation cross section for two proton emission were determined with two different techniques. The inclusive measurement yields a cross section of 214(29stat)(20sys) mb, whereas the exclusive reconstruction results in a cross section of 226(14stat)(23sys) mb. Both results are in very good agreement. The Coulomb dissociation cross section for the one-proton emission channel is extracted solely from the exclusive measurement and is 54(8stat)(6sys) mb.
Furthermore, the development of the Low Energy Neutron detector Array (LENA) for the upcoming R3B setup is described. The detector will be utilized in charge-exchange reactions to detect the low-energy recoil neutrons from (p,n)-type reactions. These reaction studies are of particular importance in the astrophysical context and can be used to constrain half lifes under stellar conditions. In the frame of this work, prototypes of the detector were built and successfully commissioned in several international laboratories.
The analysis was supported by detailed simulations of the detection characteristics.