Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 138, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physe.2021.115061
Keywords
Topological insulators; Lead-salt semiconductors; Spin-orbit coupling; Quantum wells
Funding
- Sao Paulo Research Foundation (FAPESP) [2016/03854-9]
- Scuola Normale Superiore di Pisa
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [PNPD 88882.306206/2018-01]
- [(CAPES) -PNPD 88882.306206/2018-01]
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The electronic structure of lead-salt topological quantum wells is investigated using an effective model. The study reveals new features in the spectrum, including large band splittings in asymmetric quantum wells for the topological Dirac states within the energy gap.
The electronic structure of lead-salt (IV-VI semiconductor) topological quantum wells (T-QWs) is investigated with analytical solutions of the effective 4x4 Dimmock k & BULL; p model, which gives an accurate description of the bands around the fundamental energy gap. Specific results for three-layer Pb1-xSnxTe nanostructures with varying Sn composition are presented and the main differences between topological and normal (N) QWs highlighted. A series of new features are found in the spectrum of T-QWs, in particular in asymmetric QWs where large (Rashba spin-orbit) splittings are obtained for the topological Dirac states inside the gap.
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