Nuclear spin cooling by helicity-alternated optical pumping at weak magnetic fields in $n$-GaAs

Abstract

The spin dynamics of localized donor-bound electrons interacting with the nuclear spin ensemble in $n$-doped GaAs epilayers is studied using nuclear spin polarization by light with modulated circular polarization. We show that the observed build-up of the nuclear spin polarization is a result of competition between nuclear spin cooling and nuclear spin warm-up in the oscillating Knight field. The developed model allows us to explain the dependence of nuclear spin polarization on the modulation frequency and to estimate the equilibration time of the nuclear spin system that appears to be shorter than the transverse relaxation time $T_2$ determined from nuclear magnetic resonance.

arXiv commentSeveral improvements to v1, 7 pages, 5 figures, corrected list of refs

References in corpus (11)

• Nuclear spin physics in quantum dots: an optical investigation
• Low-temperature spin relaxation in n-type GaAs
• Optical polarization of nuclear spins in silicon carbide
• Manipulation of the Spin Memory of Electrons in n-GaAs
• Spectrum of the Nuclear Environment for GaAs Spin Qubits
• Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots
• Longitudinal and transversal spin dynamics of donor-bound electrons in fluorine-doped ZnSe: spin inertia versus Hanle effect
• Light-induced nuclear quadrupolar relaxation in semiconductors
• Full coherent control of nuclear spins in an optically pumped single quantum dot
• Nuclear spin relaxation in n-GaAs: from insulating to metallic regime
• Nuclear spin warm-up in bulk n-GaAs

Cited by in corpus (3)

• Unveiling the electron-nuclear spin dynamics in an n-doped InGaAs epilayer by spin noise spectroscopy
• Nuclear spin-lattice relaxation in p-type GaAs
• Subsecond nuclear spin dynamics in $n$-GaAs