Optical absorption of polarized light in InAs/GaSb quantum wellsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 8 апреля 2022 г.
Аннотация: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.
Статья цитируется в работе
P. Aceituno, A. Hernández-Cabrera,
Superlattices and Microstructures,
Volume 111, November 2017, Pages 446-456
и работе
Семенихин И.А., Захарова А.А., Chao K.A.
в журнале Труды Физико-технологического института, издательство Физико-технологический институт РАН (Москва), том 20, с. 57-65 (2009).
This work was financially supported by the
Russian Foundation for Basic Research under grant No. 07-02-00680-a and by the Royal Swedish
Academy of Sciences for cooperation between Sweden and the former Soviet Union.