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Multi-center magnon excitations open the entire Brillouin zone to terahertz magnetometry of quantum magnets

  • Due to the small photon momentum, optical spectroscopy commonly probes magnetic excitations only at the center of the Brillouin zone; however, there are ways to override this restriction. In case of the distorted kagome quantum magnet Y-kapellasite, Y3Cu9(OH)19Cl8, under scrutiny here, the spin (magnon) density of states (SDOS) can be accessed over the entire Brillouin zone through three-center magnon excitations. This mechanism is aided by the three different magnetic sublattices and strong short-range correlations in the distorted kagome lattice. The results of THz time-domain experiments agree remarkably well with linear spin-wave theory (LSWT). Relaxing the conventional zone-center constraint of photons gives a new aspect to probe magnetism in matter.

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Author:Tobias BiesnerORCiDGND, Seulki RohORCiD, Aleksandar RazpopovORCiD, Jannis WillwaterORCiD, Stefan SüllowORCiDGND, Ying LiGND, Katharina M. Zoch, Marisa MedardeORCiD, Jürgen NussORCiD, Denis Gorbunov, Yurii SkourskiORCiDGND, Andrej PustogowORCiDGND, Stuart E. Brown, Cornelius KrellnerORCiDGND, Roser ValentíORCiDGND, Pascal PuphalORCiDGND, Martin DresselORCiDGND
URN:urn:nbn:de:hebis:30:3-819665
DOI:https://doi.org/10.1002/qute.202200023
ISSN:2511-9044
Parent Title (English):Advanced quantum technologies
Publisher:Wiley-VCH Verlag
Place of publication:Weinheim
Document Type:Article
Language:English
Date of Publication (online):2022/03/25
Date of first Publication:2022/03/25
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/02/06
Tag:kagome lattices; multi-center magnons; terahertz magnetometry; terahertz photons
Volume:5
Issue:6, 2200023
Article Number:2200023
Page Number:10
Institutes:Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International

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