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Optical absorption of polarized light in InAs/GaSb quantum wells
Institute of Physics and Technology of the Russian Academy of Sciences, Nakhimovskii Avenue 34, Moscow 117218, Russian Federation.
Institute of Physics and Technology of the Russian Academy of Sciences, Nakhimovskii Avenue 34, Moscow 117218, Russian Federation.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
2008 (English)In: Semiconductor Science and Technology, ISSN 0268-1242, E-ISSN 1361-6641, Vol. 23, no 12Article in journal (Refereed) Published
Abstract [en]

Using an eight-band k p model Hamiltonian with the Burt-Foreman envelope function theory, we have investigated the optical absorption of both linearly and circularly polarized light, as well as related phenomena in InAs/GaSb broken-gap quantum wells grown along the [0 0 1] direction, with emphasis on the effects of electron-hole hybridization and the various symmetry-breaking mechanisms such as structural inversion asymmetry, bulk inversion asymmetry and interface Hamiltonian. The optical matrix elements exhibit unusual angular dependence in close connection with the spin-flip transitions which are originally forbidden. The spin split of the 2e subband results in two profound absorption peaks for the 1hh-2e transition for both linearly polarized and circularly polarized light. A large lateral optical anisotropy appears in the absorption coefficient of linearly polarized light, which can reach almost 100% with a reducing thickness of the quantum well. For the absorption of circularly polarized light, we found a large enhancement of electron spin polarization in the upper 2e subband, which was generally considered as forbidden if the polarization is along the direction perpendicular to the plane-of-light incidence. © 2008 IOP Publishing Ltd.

Place, publisher, year, edition, pages
2008. Vol. 23, no 12
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47654DOI: 10.1088/0268-1242/23/12/125044OAI: oai:DiVA.org:liu-47654DiVA: diva2:268550
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Chao, K.A.

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