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Title: Optical anisotropy in type-II quantum wells on high-index substrates

Optical anisotropy in type-II quantum wells (QWs) on high-index (11n) substrates is studied theoretically. By solving 6 × 6 Luttinger-Kohn Hamiltonian, we analyze GaSb{sub x}As{sub 1-x}/In{sub x}Ga{sub 1-x}As type-II QWs and calculate the degree ρ of polarization at various compositions X. With increasing X, the preferential direction of the polarization is changed from [11-2/n] ([-110]) to [-110] ([11-2/n]) directions for n > 1 (n < 1). The optical anisotropy can be vanished even on high-index (11n) substrates by adjusting the composition X. These curious polarization properties are originated from the spatial separation of electrons and holes in the type-II QWs, where the overlap integral of their wave functions is strongly affected by the composition X.
Authors:
 [1]
  1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
Publication Date:
OSTI Identifier:
22278118
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ANISOTROPY; CONCENTRATION RATIO; ELECTRONS; GALLIUM ANTIMONIDES; HAMILTONIANS; HETEROJUNCTIONS; HOLES; INDIUM ANTIMONIDES; POLARIZATION; QUANTUM WELLS; SUBSTRATES; WAVE FUNCTIONS; X-RAY SPECTROSCOPY