Asymmetric versus symmetric HgTe / Cd x Hg 1 - X Te double quantum wells: Bandgap tuning without electric field
Само за регистроване кориснике
2020
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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 subb...ands are shown to exhibit inverted ordering, and therefore, a nontrivial topological phase could emerge in the system. © 2020 Author(s).
Извор:
Journal of Applied Physics, 2020, 128, 6Финансирање / пројекти:
- Ministry of Education, Science and Technological Development of the Republic of Serbia
- Flemish Science Foundation (FWO-Vl)
DOI: 10.1063/5.0016069
ISSN: 0021-8979
WoS: 000561339300001
Scopus: 2-s2.0-85089919204
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Институција/група
VinčaTY - 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 . .