Research output: Contribution to journal › Article › peer-review
Optical Orientation of Excitons in a Longitudinal Magnetic Field in Indirect-Band-Gap (In,Al)As/AlAs Quantum Dots with Type-I Band Alignment. / Shamirzaev, T S; Shumilin, A V; Smirnov, D S et al.
In: Nanomaterials, Vol. 13, No. 4, 729, 14.02.2023.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Optical Orientation of Excitons in a Longitudinal Magnetic Field in Indirect-Band-Gap (In,Al)As/AlAs Quantum Dots with Type-I Band Alignment
AU - Shamirzaev, T S
AU - Shumilin, A V
AU - Smirnov, D S
AU - Kudlacik, D
AU - Nekrasov, S V
AU - Kusrayev, Yu G
AU - Yakovlev, D R
AU - Bayer, M
N1 - Funding: The work of D.K., D.R.Y., and M.B. was supported by Deutsche Forschungsgemeinschaft via project No. 409810106. D.S.S. thanks Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS.” The development of the analytical theoretical model of QD blockade by D.S.S. was supported by Russian Science Foundation, grant No. 21-72-10035. All experimental activities conducted by T.S.S., including sample growth, microscopy, and investigation of the energy level spectra and magneto-optical properties, as well as exciton recombination and spin dynamics, were supported by a grant of Russian Science Foundation (No. 22-12-00022). The numerical calculations of luminescence polarization and intensity conducted by A.V.S. were supported by a grant of Russian Science Foundation (No. 22-12-00125).
PY - 2023/2/14
Y1 - 2023/2/14
N2 - Exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment were studied. The negligible (less than 0.2 μeV) value of the anisotropic exchange interaction in these QDs prevents the mixing of the excitonic basis states and makes the formation of spin-polarized bright excitons possible under quasi-resonant, circularly polarized excitation. The recombination and spin dynamics of excitons are controlled by the hyperfine interaction between the electron and nuclear spins. A QD blockade by dark excitons was observed in the magnetic field, that eliminates the impact of nuclear spin fluctuations. A kinetic model which accounts for the population dynamics of the bright and dark exciton states as well as for the spin dynamics was developed to quantitatively describe the experimental data.
AB - Exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment were studied. The negligible (less than 0.2 μeV) value of the anisotropic exchange interaction in these QDs prevents the mixing of the excitonic basis states and makes the formation of spin-polarized bright excitons possible under quasi-resonant, circularly polarized excitation. The recombination and spin dynamics of excitons are controlled by the hyperfine interaction between the electron and nuclear spins. A QD blockade by dark excitons was observed in the magnetic field, that eliminates the impact of nuclear spin fluctuations. A kinetic model which accounts for the population dynamics of the bright and dark exciton states as well as for the spin dynamics was developed to quantitatively describe the experimental data.
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85149028050&origin=inward&txGid=e2586b15d91efc10682c833c16d80fb4
UR - http://arxiv.org/abs/2301.11138
UR - https://www.mendeley.com/catalogue/07e6ec97-17b2-3812-9cb1-ffa561547f51/
U2 - 10.3390/nano13040729
DO - 10.3390/nano13040729
M3 - Article
C2 - 36839097
VL - 13
JO - Nanomaterials
JF - Nanomaterials
SN - 2079-4991
IS - 4
M1 - 729
ER -
ID: 44521191