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A self-consistent investigation of the semimetal-semiconductor transition in InAs/GaSb quantum wells under external electric fields

Lapushkin, I; Zakharova, A; Yen, ST and Chao, Koung-An LU (2004) In Journal of Physics: Condensed Matter1990-01-01+01:00 16(26). p.4677-4684
Abstract
We investigate the phase transitions in InAs/GaSb quantum wells sandwiched between two wide-gap AlSb barrier layers under an external electric field perpendicular to interfaces. The Schrodinger and the Poisson equations are solved self-consistently to derive the subband dispersions, the potential profile, the electron charge distribution in the InAs layer, and the hole charge distribution in the GaSb layer. The Burt-Foreman envelope function theory and the scattering matrix method are used to solve the Schrodinger equation in the framework of the eight-band k (.) p model, including the spin-splitting of subbands in our calculation. We have found that in a thick InAs/GaSb quantum well, which has been investigated experimentally by Cooper et... (More)
We investigate the phase transitions in InAs/GaSb quantum wells sandwiched between two wide-gap AlSb barrier layers under an external electric field perpendicular to interfaces. The Schrodinger and the Poisson equations are solved self-consistently to derive the subband dispersions, the potential profile, the electron charge distribution in the InAs layer, and the hole charge distribution in the GaSb layer. The Burt-Foreman envelope function theory and the scattering matrix method are used to solve the Schrodinger equation in the framework of the eight-band k (.) p model, including the spin-splitting of subbands in our calculation. We have found that in a thick InAs/GaSb quantum well, which has been investigated experimentally by Cooper et al (1998 Phys. Rev. B 57 11915), under low external electric fields, two electron levels stay below the highest hole level at zero in-plane wavevector k(parallel to) = 0. Then, the anticrossings of electron and hole levels produce several minigaps in the inplane dispersions, inside which the states of other subbands exist. As a result, the system is in a sernimetal phase. With increasing external electric field, the semimetal phase changes to semiconductor phase with only one hybridization gap. When all electron levels become higher than the hole levels at higher electric fields, the system has a semiconducting gap. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics: Condensed Matter1990-01-01+01:00
volume
16
issue
26
pages
4677 - 4684
publisher
IOP Publishing
external identifiers
  • wos:000223086300005
  • scopus:3142658267
ISSN
1361-648X
DOI
10.1088/0953-8984/16/26/003
language
English
LU publication?
yes
id
93c30b7e-eb8a-4d38-9df5-f556e470bcdf (old id 271126)
date added to LUP
2007-08-03 09:21:43
date last changed
2017-11-05 04:20:58
@article{93c30b7e-eb8a-4d38-9df5-f556e470bcdf,
  abstract     = {We investigate the phase transitions in InAs/GaSb quantum wells sandwiched between two wide-gap AlSb barrier layers under an external electric field perpendicular to interfaces. The Schrodinger and the Poisson equations are solved self-consistently to derive the subband dispersions, the potential profile, the electron charge distribution in the InAs layer, and the hole charge distribution in the GaSb layer. The Burt-Foreman envelope function theory and the scattering matrix method are used to solve the Schrodinger equation in the framework of the eight-band k (.) p model, including the spin-splitting of subbands in our calculation. We have found that in a thick InAs/GaSb quantum well, which has been investigated experimentally by Cooper et al (1998 Phys. Rev. B 57 11915), under low external electric fields, two electron levels stay below the highest hole level at zero in-plane wavevector k(parallel to) = 0. Then, the anticrossings of electron and hole levels produce several minigaps in the inplane dispersions, inside which the states of other subbands exist. As a result, the system is in a sernimetal phase. With increasing external electric field, the semimetal phase changes to semiconductor phase with only one hybridization gap. When all electron levels become higher than the hole levels at higher electric fields, the system has a semiconducting gap.},
  author       = {Lapushkin, I and Zakharova, A and Yen, ST and Chao, Koung-An},
  issn         = {1361-648X},
  language     = {eng},
  number       = {26},
  pages        = {4677--4684},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics: Condensed Matter1990-01-01+01:00},
  title        = {A self-consistent investigation of the semimetal-semiconductor transition in InAs/GaSb quantum wells under external electric fields},
  url          = {http://dx.doi.org/10.1088/0953-8984/16/26/003},
  volume       = {16},
  year         = {2004},
}