Disorder-induced phase transitions in double HgTe quantum wells
| Autor: | Krishtopenko, S. S., Ikonnikov, A. V., Jouault, B., Teppe, F. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | By using the self-consistent Born approximation, we investigate disorder effect induced by short-range impurities on the band-gap of a seminal two-dimensional (2D) system, whose phase diagram contains trivial, single-band-inverted and double-band-inverted states. Following the density-of-states (DOS) evolution, we demonstrate multiple closings and openings of the band-gap with the increase of the disorder strength. Calculations of the spectral function describing the quasiparticles at the $\Gamma$ point of the Brillouin zone evidence that the observed band-gap behavior is unambiguously caused by the topological phase transitions due to the mutual inversions between the first and second electron-like and hole-like subbands. We also find that an increase in the disorder strength in the double-inverted state always leads to the band-gap closing due to the overlap of the tails of DOS from conduction and valence subbands. Comment: 10 pages, 4 figures |
| Databáze: | arXiv |
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