TY  - INPR
A1  - Álvarez Pari, Nayra A.
A1  - Bharadwaj, Venkata Krishna
A1  - Jaeschke-Ubiergo, Rodrigo
A1  - Valadkhani, Adrian
A1  - Valentí, Roser
A1  - Šmejkal, Libor
A1  - Sinova, Jairo
T1  - Strain control of band topology and surface states in antiferromagnetic EuCd2As2
T2  - arXiv
N2  - Topological semimetal antiferromagnets provide a rich source of exotic topological states which can be controlled by manipulating the orientation of the Néel vector, or by modulating the lattice parameters through strain. We investigate via ab initio density functional theory calculations, the effects of shear strain on the bulk and surface states n two antiferromagnetic EuCd2As2 phases with out-of-plane and in-plane spin configurations. When magnetic moments are along the c-axis, a 3% longitudinal or diagonal shear strain can tune the Dirac semimetal phase to an axion insulator phase, characterized by the parity-based invariant η4I=2. For an in-plane magnetic order, the axion insulator phase remains robust under all shear strains. We further find that for both magnetic orders, the bulk gap increases and a surface gap opens on the (001) surface up to 16 meV. Because of a nonzero η4I index and gapped states on the (001) surface, hinge modes are expected to happen on the side surface states between those gapped surface states. This result can provide a valuable insight in the realization of the long-sought axion states.
Y1  - 2023
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/82426
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-824263
UR  - https://arxiv.org/abs/2310.19186v1
IS  - 2310.19186 Version 1
PB  - arXiv
ER  -