Nonexponential decoherence of collective spin states in 2DES probed by time-resolved Kerr rotation

The spin coherence of two-dimensional electrons is determined by two independent mechanisms: a single particle relaxation owing to spatially fluctuating magnetic field, and a many-particle exchange interaction maintaining collective precession of the electron spins with a common Larmor frequency. In...

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Bibliographic Details
Published in:Solid state communications 2021-10, Vol.336, p.114285, Article 114285
Main Authors: Stepanets-Khussein, E., Musina, L.I., Larionov, A.V., Zhuravlev, A.S., Kukushkin, I.V., Kulik, L.V.
Format: Article
Language:English
Subjects:
Spin coherence
Spin stiffness
Time-resolved Kerr rotation
Two-dimensional electron system
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Summary:The spin coherence of two-dimensional electrons is determined by two independent mechanisms: a single particle relaxation owing to spatially fluctuating magnetic field, and a many-particle exchange interaction maintaining collective precession of the electron spins with a common Larmor frequency. In this study, we investigate the structure of a time-resolved Kerr rotation signal for the different spin states of two-dimensional electron system subjected to the quantizing magnetic field. At low temperatures, when spin–spin correlations define the ground state of the two-dimensional electron system, our data show a nonlinear damping of Larmor oscillations. The amplitude and the correlation length of the fluctuating magnetic field acting on individual electron spins are estimated. •The structure of time-resolved Kerr rotation signal is studied.•Nonlinear damping of Larmor oscillations in 2DES is observed.•Independent confirmation of the local incompressibility in the state ν = 3/2 is found.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2021.114285