Nanosecond Spin Coherence Time of Nonradiative Excitons in GaAs/AlGaAs Quantum Wells

A.V. Trifonov, E.S. Khramtsov, K.V. Kavokin, I.V. Ignatiev, A.V. Kavokin, Y.P. Efimov, S.A. Eliseev, P/Yu. Shapochkin, M. Bayer

Research output

2 Citations (Scopus)

Abstract

We report on the experimental evidence for a nanosecond timescale spin memory based on nonradiative excitons with large in-plane wave vector. The effect manifests itself in magnetic-field-induced oscillations of the energy of the optically active (radiative) excitons. The oscillations detected by a spectrally resolved pump-probe technique applied to a GaAs/AlGaAs quantum well structure in a transverse magnetic field persist over a timescale, which is orders of magnitude longer than the characteristic decoherence time in the system. The effect is attributed to the spin-dependent electron-electron exchange interaction of the optically active and inactive excitons. The spin relaxation time of the electrons belonging to nonradiative excitons appears to be much longer than the hole spin relaxation time.

Original languageEnglish
Article number147401
Number of pages6
JournalPhysical Review Letters
Volume122
Issue number14
DOIs
Publication statusPublished - 11 Apr 2019

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aluminum gallium arsenides
excitons
quantum wells
relaxation time
oscillations
electrons
magnetic fields
plane waves
pumps
probes
interactions
energy

Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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title = "Nanosecond Spin Coherence Time of Nonradiative Excitons in GaAs/AlGaAs Quantum Wells",
abstract = "We report on the experimental evidence for a nanosecond timescale spin memory based on nonradiative excitons with large in-plane wave vector. The effect manifests itself in magnetic-field-induced oscillations of the energy of the optically active (radiative) excitons. The oscillations detected by a spectrally resolved pump-probe technique applied to a GaAs/AlGaAs quantum well structure in a transverse magnetic field persist over a timescale, which is orders of magnitude longer than the characteristic decoherence time in the system. The effect is attributed to the spin-dependent electron-electron exchange interaction of the optically active and inactive excitons. The spin relaxation time of the electrons belonging to nonradiative excitons appears to be much longer than the hole spin relaxation time.",
keywords = "EXCITONS, Gallium arsenide, III-V semiconductors, Magnetic fields, Quantum theory, Relaxation time, Semiconducting gallium",
author = "A.V. Trifonov and E.S. Khramtsov and K.V. Kavokin and I.V. Ignatiev and A.V. Kavokin and Y.P. Efimov and S.A. Eliseev and P/Yu. Shapochkin and M. Bayer",
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day = "11",
doi = "10.1103/PhysRevLett.122.147401",
language = "English",
volume = "122",
journal = "Physical Review Letters",
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publisher = "American Physical Society",
number = "14",

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TY - JOUR

T1 - Nanosecond Spin Coherence Time of Nonradiative Excitons in GaAs/AlGaAs Quantum Wells

AU - Trifonov, A.V.

AU - Khramtsov, E.S.

AU - Kavokin, K.V.

AU - Ignatiev, I.V.

AU - Kavokin, A.V.

AU - Efimov, Y.P.

AU - Eliseev, S.A.

AU - Shapochkin, P/Yu.

AU - Bayer, M.

PY - 2019/4/11

Y1 - 2019/4/11

N2 - We report on the experimental evidence for a nanosecond timescale spin memory based on nonradiative excitons with large in-plane wave vector. The effect manifests itself in magnetic-field-induced oscillations of the energy of the optically active (radiative) excitons. The oscillations detected by a spectrally resolved pump-probe technique applied to a GaAs/AlGaAs quantum well structure in a transverse magnetic field persist over a timescale, which is orders of magnitude longer than the characteristic decoherence time in the system. The effect is attributed to the spin-dependent electron-electron exchange interaction of the optically active and inactive excitons. The spin relaxation time of the electrons belonging to nonradiative excitons appears to be much longer than the hole spin relaxation time.

AB - We report on the experimental evidence for a nanosecond timescale spin memory based on nonradiative excitons with large in-plane wave vector. The effect manifests itself in magnetic-field-induced oscillations of the energy of the optically active (radiative) excitons. The oscillations detected by a spectrally resolved pump-probe technique applied to a GaAs/AlGaAs quantum well structure in a transverse magnetic field persist over a timescale, which is orders of magnitude longer than the characteristic decoherence time in the system. The effect is attributed to the spin-dependent electron-electron exchange interaction of the optically active and inactive excitons. The spin relaxation time of the electrons belonging to nonradiative excitons appears to be much longer than the hole spin relaxation time.

KW - EXCITONS

KW - Gallium arsenide

KW - III-V semiconductors

KW - Magnetic fields

KW - Quantum theory

KW - Relaxation time

KW - Semiconducting gallium

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UR - http://www.mendeley.com/research/nanosecond-spin-coherence-time-nonradiative-excitons-gaasalgaas-quantum-wells

U2 - 10.1103/PhysRevLett.122.147401

DO - 10.1103/PhysRevLett.122.147401

M3 - Article

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 14

M1 - 147401

ER -