Entanglement entropy and entanglement spectrum of Bi Sb (1 1 1) bilayers.
Clicks: 169
ID: 97147
2018
We study topological properties of Bi Sb bilayers in the (1 1 1) plane using entanglement measures. Electronic structures are investigated within multi-orbital tight-binding model and structural stability is confirmed through first-principles calculations. The topologically non-trivial nature of the bismuth bilayer is proved by the presence of spectral flow in the entanglement spectrum. We consider topological phase transitions driven by a composition change x, an applied external electric field in Bi bilayers and strain in Sb bilayers. Composition- and strain-induced phase transitions reveal a finite discontinuity in the entanglement entropy. This quantity remains a continuous function of the electric field strength, but shows a finite discontinuity in the first derivative. We relate the difference in behavior of the entanglement entropy to the breaking of inversion symmetry in the last case.
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brzeziska2018entanglementjournal
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| Authors | Brzezińska, Marta;Bieniek, Maciej;Woźniak, Tomasz;Potasz, Paweł;Wójs, Arkadiusz; |
| Journal | journal of physics condensed matter : an institute of physics journal |
| Year | 2018 |
| DOI | 10.1088/1361-648X/aaaf54 |
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