Faculty of Physics
M.V.Lomonosov Moscow State University
Menu
Regular Article

Size quatized levels of the valence band and the optical gain in strained $p$-AlGaAs/GaAsP/$n$-AlGaAs structures under uniaxial compression

E.V. Bogdanov$^1$, N.B. Brandt$^1$, N.Ya. Minina$^1$, S.S. Shirokov$^2$

Moscow University Physics Bulletin 2011. 66. N 6. P. 568

  • Article
Annotation

The band structure, size quatized levels, and wave functions in the conduction and valence bands of strained n-Al$_{x}$Ga$_{1-x}$As/GaAs$_{y}$P$_{1-y}$/p-Al$_{x}$Ga$_{1-x}$As (y = 0.84) heterostructures are calculated numerically upon a uniaxial compression along the [110] direction. The calculation indicates a sublinear increase of the effective optical gap in the GaAs$_{0.84}$P$_{0.16}$ quantum well, strong mixing of states of light and heavy holes, and merging of the corresponding ground states in the quantum well of the valence band under a pressure of 4.5–5 kbar. The calculation of matrix elements of the electron-photon interaction operator for a system of possible interband transitions permits one to determine the optical gain for the TE and TM modes. The increase in this coefficient by two to fourfold under uniaxial compression agrees with the previously published experimental data on the increase of the electroluminescence intensity.

Received: 2011 June 9
Approved: 2012 March 20
PACS:
73.40.Kp III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
78.60.Fi Electroluminescence
78.67.De Quantum wells
Authors
E.V. Bogdanov$^1$, N.B. Brandt$^1$, N.Ya. Minina$^1$, S.S. Shirokov$^2$
$^1$Department of Low Temperatures and Superconductivity, Faculty of Physics, Moscow State University, Moscow, 119991, Russia
$^2$Department of Semiconductor Physics, Faculty of Physics, Moscow State University, Moscow, 119991, Russia
Issue 6, 2011

Moscow University Physics Bulletin

Science News of the Faculty of Physics, Lomonosov Moscow State University

This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.