Electron spin dephasing and optical pumping of nuclear spins in GaN - INSA Toulouse - Institut National des Sciences Appliquées de Toulouse Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2014

Electron spin dephasing and optical pumping of nuclear spins in GaN

Abstract

We have measured the donor-bound electron spin dynamics in cubic GaN by time-resolved Kerr rotation experiments. The ensemble electron spin dephasing time in this quantum-dot-like system characterized by a Bohr radius of 2.5 nm is of the order of 1.5 ns as a result of the interaction with the fluctuating nuclear spins. It increases drastically when an external magnetic field as small as 10 mT is applied. We extract a dispersion of the nuclear hyperfine field δBn∼4mT, in agreement with calculations. We also demonstrate for the first time in GaN-based systems the optical pumping of nuclear spin yielding the buildup of a significant nuclear polarization.
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Dates and versions

hal-02052146 , version 1 (28-02-2019)

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  • HAL Id : hal-02052146 , version 1

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Gang Wang, C. Zhu, B. Liu, H. Ye, Andrea Balocchi, et al.. Electron spin dephasing and optical pumping of nuclear spins in GaN. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90 (12). ⟨hal-02052146⟩
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