Naslov
Topological Properties of the 2D 2-Band System with Generalized W-Shaped Band Inversion

Autori
Rukelj, Zoran ; Radić, Danko

Izvornik
Quantum Reports (2304-6775) 4 (2022); 476-485

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Berry phase ; geometric phase ; anomalous quantum Hall effect ; Chern number ; topological insulators ; Chern insulators ; Bernevig–Hughes–Zhang Hamiltonian ; conical intersections

Sažetak
We report the topological properties, in terms of the Berry phase, of the 2D noninteracting system with electron–hole band inversion, described by the two-band generalized analogue of the low-energy Bernevig–Hughes–Zhang Hamiltonian, yielding the W-shaped energy bands in the form of two intersecting cones with the gap along the closed continuous loop. We identify the range of parameters where the Berry phase attains qualitatively different values: (a) the integer multiplier of 2π, (b) the integer multiplier of π, and (c) the nontrivial value between the latter two, which depends on the system parameters. The system thus exhibits the anomalous quantum Hall effect associated with the nontrivial geometric phase, which is presumably tunable through the choice of parameters at hand.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA