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Two-phonon process and hyperfine interaction limiting slow hole-spin relaxation time in InAs/GaAs quantum dots

We study the hole-spin relaxation in p-doped InAs quantum dots. Two relaxation mechanisms are evidenced, at low magnetic field (0 < or = B < or = 2T) and low temperature (2 < or = T < or = 50K), by using a pump-probe configuration and a recent experimental technique working in the freque...

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Published in:	Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-07, Vol.86 (4), Article 045306
Main Authors:	Fras, F., Eble, B., Desfonds, P., Bernardot, F., Testelin, C., Chamarro, M., Miard, A., Lemaître, A.
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Language:	English
Subjects:	Approximation Condensed matter Constraining Indium arsenides Inhomogeneity Magnetic fields Physics Quantum dots Quantum Physics Texts
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container_title	Physical review. B, Condensed matter and materials physics
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creator	Fras, F. Eble, B. Desfonds, P. Bernardot, F. Testelin, C. Chamarro, M. Miard, A. Lemaître, A.
description	We study the hole-spin relaxation in p-doped InAs quantum dots. Two relaxation mechanisms are evidenced, at low magnetic field (0 < or = B < or = 2T) and low temperature (2 < or = T < or = 50K), by using a pump-probe configuration and a recent experimental technique working in the frequency domain. At T = 2K, the coupling to nuclear spins and the hole wave-function inhomogeneity fix the hole-spin relaxation rate value, (ProQuest: Formulae and/or non-USASCII text omitted) [approximate] 1 mu s super(-1). It decreases with increasing magnetic field and reaches a plateau at 0.4 mu s super(-1). At T >or = 7K, two-phonon spin-orbit process dominates and leads to a quadratic temperature dependence of (ProQuest: Formulae and/or non-USASCII text omitted) in good agreement with theory.
doi_str_mv	10.1103/PhysRevB.86.045306
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source	American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects	Approximation Condensed matter Constraining Indium arsenides Inhomogeneity Magnetic fields Physics Quantum dots Quantum Physics Texts
title	Two-phonon process and hyperfine interaction limiting slow hole-spin relaxation time in InAs/GaAs quantum dots
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