Strain control of band topology and surface states in antiferromagnetic EuCd2As2

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00586761" target="_blank" >RIV/68378271:_____/24:00586761 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevB.109.195117" target="_blank" >https://doi.org/10.1103/PhysRevB.109.195117</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.109.195117" target="_blank" >10.1103/PhysRevB.109.195117</a>

Result language
angličtina
Original language name
Strain control of band topology and surface states in antiferromagnetic EuCd2As2
Original language description
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 in 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 valuable insight into the realization of the long-sought axion states.n
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GX19-28375X" target="_blank" >GX19-28375X: Terahertz and neuromorphic memories based on antiferromagnets</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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