Electronic Structure of a Two-Dimensional Graphene-Like Topological Insulator, Bi14Rh3I9
Abstract
Very recently, a new two-dimensional graphene-like topological insulator, Bi14Rh3I9, has been synthesized. The Bi-Rh sheets with a strong spin-orbit interaction are graphene analogues with a honeycomb net composed of RhBi8 cubes. Here we derive the low-energy effective Hamiltonian involving spin-orbit coupling for Bi14Rh3I9. In the absence of spin-orbit coupling, the Bi-Rh sheets show two inequivalent Dirac cones at the corners of the hexagonal Brillouin zone. The spin-orbit interaction opens a 2400 K bandgap at the Dirac points and establishes the quantum spin Hall effect in the Bi-Rh sheets. Our result indicates that the Bi14Rh3I9 may combine many unique electronic properties of graphene and topological insulators, and it should host a combination of quantum valley and spin Hall effects.
- Publication:
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arXiv e-prints
- Pub Date:
- May 2013
- DOI:
- 10.48550/arXiv.1305.0121
- arXiv:
- arXiv:1305.0121
- Bibcode:
- 2013arXiv1305.0121C
- Keywords:
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- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- This paper has been withdrawn by the author due to a crucial sign error in equation