TY  - JOUR
AU  - Topalović, Dušan
AU  - Arsoski, Vladimir V.
AU  - Tadić, Milan Ž.
AU  - Peeters, Francois M.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9616
AB  - We investigate the electron states in double asymmetric HgTe / Cd x Hg 1 - x Te quantum wells grown along the [001] direction. The subbands are computed by means of the envelope function approximation applied to the eight-band Kane k ⋅ p model. The asymmetry of the confining potential of the double quantum wells results in a gap opening, which is absent in the symmetric system where it can only be induced by an applied electric field. The bandgap and the subbands are affected by spin-orbit coupling, which is a consequence of the asymmetry of the confining potential. The electron-like and hole-like states are mainly confined in different quantum wells, and the enhanced hybridization between them opens a spin-dependent hybridization gap at a finite in-plane wavevector. We show that both the ratio of the widths of the two quantum wells and the mole fraction of the C d x H g 1 - x Te barrier control both the energy gap between the hole-like states and the hybridization gap. The energy subbands are shown to exhibit inverted ordering, and therefore, a nontrivial topological phase could emerge in the system. © 2020 Author(s).
T2  - Journal of Applied Physics
T1  - Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field
VL  - 128
IS  - 6
DO  - 10.1063/5.0016069
ER  - 

@article{
author = "Topalović, Dušan and Arsoski, Vladimir V. and Tadić, Milan Ž. and Peeters, Francois M.",
year = "2020",
abstract = "We investigate the electron states in double asymmetric HgTe / Cd x Hg 1 - x Te quantum wells grown along the [001] direction. The subbands are computed by means of the envelope function approximation applied to the eight-band Kane k ⋅ p model. The asymmetry of the confining potential of the double quantum wells results in a gap opening, which is absent in the symmetric system where it can only be induced by an applied electric field. The bandgap and the subbands are affected by spin-orbit coupling, which is a consequence of the asymmetry of the confining potential. The electron-like and hole-like states are mainly confined in different quantum wells, and the enhanced hybridization between them opens a spin-dependent hybridization gap at a finite in-plane wavevector. We show that both the ratio of the widths of the two quantum wells and the mole fraction of the C d x H g 1 - x Te barrier control both the energy gap between the hole-like states and the hybridization gap. The energy subbands are shown to exhibit inverted ordering, and therefore, a nontrivial topological phase could emerge in the system. © 2020 Author(s).",
journal = "Journal of Applied Physics",
title = "Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field",
volume = "128",
number = "6",
doi = "10.1063/5.0016069"
}

Topalović, D., Arsoski, V. V., Tadić, M. Ž.,& Peeters, F. M.. (2020). Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field. in Journal of Applied Physics, 128(6).
https://doi.org/10.1063/5.0016069

Topalović D, Arsoski VV, Tadić MŽ, Peeters FM. Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field. in Journal of Applied Physics. 2020;128(6).
doi:10.1063/5.0016069 .

Topalović, Dušan, Arsoski, Vladimir V., Tadić, Milan Ž., Peeters, Francois M., "Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field" in Journal of Applied Physics, 128, no. 6 (2020),
https://doi.org/10.1063/5.0016069 . .