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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport

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Unified low-energy effective Hamiltonian and the band topology of p-block square-net layer derivatives

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Title
Unified low-energy effective Hamiltonian and the band topology of p-block square-net layer derivatives
Author
Hyun, S.I.Lee, InhoLee, GeunsikShim, J.H.
Issue Date
2018-10
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.98, no.16, pp.165108
Abstract
In recent years, low-dimensional materials with tetragonal P4/nmm (orthorhombic Pnma) space group having square-net (chainlike) substructure of p-block elements have been studied extensively. By using a first-principles calculation and a two-sites ⊗ two-orbitals tight-binding model, we construct the unified low-energy effective Hamiltonian and the Z2 topological phase diagram for such materials with different filling factors. Near the chemical potential, we show that the staggered arrangement of ions at 2c (4c) site yields a virtual hopping that has the same form with the second nearest-neighbor hopping between the square-net (chainlike) ions. We show that this hybridization and low-symmetry of the chainlike structure protects the quantum spin Hall insulator phase. Finally, the second-order spin-orbit coupling on top of the atomic spin-orbit coupling is considered to clarify the origin of the nonzero Berry phase signals reported in recent quantum oscillation experiments.
URI
https://scholarworks.unist.ac.kr/handle/201301/24965
URL
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.165108
DOI
10.1103/PhysRevB.98.165108
ISSN
2469-9950
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