Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102100
Title: Spin dynamics and magnetic field induced polarization of excitons in ultrathin GaAs/AlAs quantum wells with indirect band gap and type-II band alignment
Authors: Shamirzaev, T. S.
Rautert, J.
Yakovlev, D. R.
Debus, J.
Gornov, A. Y.
Glazov, M. M.
Ivchenko, E. L.
Bayer, M.
Issue Date: 2017
Publisher: American Physical Society
Citation: Spin dynamics and magnetic field induced polarization of excitons in ultrathin GaAs/AlAs quantum wells with indirect band gap and type-II band alignment / T. S. Shamirzaev, J. Rautert, D. R. Yakovlev, et al. — DOI 10.1103/PhysRevB.96.035302 // Physical Review B. — 2017. — Vol. 96. — Iss. 3. — 035302.
Abstract: The exciton spin dynamics are investigated both experimentally and theoretically in two-monolayer-thick GaAs/AlAs quantum wells with an indirect band gap and a type-II band alignment. The magnetic field induced circular polarization of photoluminescence Pc is studied as function of the magnetic field strength and direction as well as sample temperature. The observed nonmonotonic behavior of these functions is provided by the interplay of bright and dark exciton states contributing to the emission. To interpret the experiment, we have developed a kinetic master equation model which accounts for the dynamics of the spin states in this exciton quartet, radiative and nonradiative recombination processes, and redistribution of excitons between these states as result of spin relaxation. The model offers quantitative agreement with experiment and allows us to evaluate, for the studied structure, the heavy-hole g factor, ghh=+3.5, and the spin relaxation times of electron, τse=33μs, and hole, τsh=3μs, bound in the exciton. © 2017 American Physical Society.
Keywords: ENERGY GAP
EXCITONS
GALLIUM ARSENIDE
III-V SEMICONDUCTORS
MAGNETIC FIELDS
POLARIZATION
SEMICONDUCTING GALLIUM
SEMICONDUCTOR QUANTUM WELLS
EXCITON SPIN DYNAMICS
MAGNETIC FIELD STRENGTHS
MASTER EQUATION MODELING
NONMONOTONIC BEHAVIORS
NONRADIATIVE RECOMBINATION PROCESS
QUANTITATIVE AGREEMENT
SPIN RELAXATION TIME
TYPE II BAND ALIGNMENTS
SPIN DYNAMICS
URI: http://hdl.handle.net/10995/102100
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85026384682
PURE ID: 1974744
24cc8380-c1e9-4046-b114-5f9ac2770846
ISSN: 24699950
DOI: 10.1103/PhysRevB.96.035302
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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