Surface states and topological invariants in three-dimensional topological insulators: Application to Bi 1 − x Sb x

By J. C. Teo, Liang Fu, C. L. Kane. 2008

467 citations recorded by the source corpus.

We study the electronic surface states of the semiconducting alloy bismuth antimony Bi1�xSbx. Using a phenomenological tight-binding model, we show that the Fermi surface for the 111 surface states encloses an odd number of time-reversal-invariant momenta TRIM in the surface Brillouin zone. This confirms that the alloy is a strong topological insulator in the 1;111 Z2 topological class. We go on to develop general arguments which show that spatial symmetries lead to additional topological structure of the bulk energy bands, and impose further constraints on the surface band structure. Inversion-symmetric band structures are characterized by eight Z2 “parity invariants,” which include the four Z2 invariants defined by time-reversal symmetry. The extra invariants determine the “surface fermion parity,” which specifies which surface TRIM are enclosed by an odd number of electron or hole pockets. We provide a simple proof of this result, which provides a direct link between the surface-state structure and the parity eigenvalues characterizing the bulk. Using this result, we make specific predictions for the surface-state structure for several faces of Bi1�xSbx .W e next show that mirror-invariant band structures are characterized by an integer “mirror Chern number” nM, which further constrains the surface states. We show that the sign of nM in the topological insulator phase of Bi1�xSbx is related to a previously unexplored Z2 parameter in the L point k · p theory of pure bismuth, which we refer to as the “mirror chirality” . The value of predicted by the tight-binding model for bismuth disagrees with the value predicted by a more fundamental pseudopotential calculation. This explains a subtle disagreement between our tight-binding surface-state calculation and previous first-principles calculations of the surface states of bismuth. This suggests that the tight-binding parameters in the Liu-Allen model of bismuth need to be reconsidered. Implications for existing and future angle-resolved photoemission spectroscopy ARPES experiments and spin-polarized ARPES experiments will be discussed.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/105dd6ae5cef9ce2e310ae7c22a7512bfaad0a52

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Ashvin Vishwanath
2. Hsin Lin
3. Arun Bansil
4. Liang Fu
5. Timothy H. Hsieh
6. Zhongbo Yan
7. Wenhui Duan
8. Junwei Liu

In Condensed Matter Physics

1. Liang Fu
2. Ashvin Vishwanath
3. Hsin Lin
4. Arun Bansil
5. Wenhui Duan
6. Timothy H. Hsieh
7. Zhongbo Yan
8. Y. Ando

In Materials Chemistry

1. Ashvin Vishwanath
2. Hsin Lin
3. Arun Bansil
4. Liang Fu
5. Wenhui Duan
6. Zhongbo Yan
7. Junwei Liu
8. Ying Ran

Citations in the corpus

• Topological superconductivity in two-dimensional altermagnetic metals (2023, background): “In the λ = 0 limit, we find that the superconductor with pure helical p -wave pairing supports helical Majorana modes protected by mir-( ror symmetry M z 52,82,83 or subsystem chiral symmetries 84,85 .”
• Two-dimensional surface state in the quantum limit of a topological insulator (2010, unknown): “Owing to the preservation of time-reversal symmetry, this coupling protects the wavefunctions against disorde”