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Nuclear effects in ultrafast quantum-well spin-dynamics

Nuclear effects in ultrafast quantum-well spin-dynamics
Nuclear effects in ultrafast quantum-well spin-dynamics
Ultrafast optical methods are used to study low temperature nuclear spin polarisation and electron spin precession and relaxation in an oblique magnetic field in undoped GaAs/AlGaAs quantum wells. We find that electron localisation dramatically extends electron spin relaxation and accelerates nuclear spin polarisation which is manifest as a large time-dependent Overhauser shift in electron Larmor precession frequency. Nuclear polarisation is a two-stage process, which we suggest involves contact hyperfine interaction at electron localisation centres and nuclear spin diffusion to the remaining nuclei of the sample. Special samples are used to investigate nuclear spin diffusion through the barriers, which is found to be an order of magnitude slower than within the wells, consistent with extra dipolar and quadrupolar disorder in the alloy.
quantum wells, hyperfine interaction, spin dynamics
1386-9477
13-16
Malinowski, A.
54fd31d4-b510-4726-a8cd-33b6b2ad0427
Brand, M.A.
cb12b5d6-fd96-4aa8-86b5-1f9ed2a96483
Harley, R.T.
54613031-f60f-45f4-9b20-e49bcfd53b77
Malinowski, A.
54fd31d4-b510-4726-a8cd-33b6b2ad0427
Brand, M.A.
cb12b5d6-fd96-4aa8-86b5-1f9ed2a96483
Harley, R.T.
54613031-f60f-45f4-9b20-e49bcfd53b77

Malinowski, A., Brand, M.A. and Harley, R.T. (2001) Nuclear effects in ultrafast quantum-well spin-dynamics. Physica E: Low-dimensional Systems and Nanostructures, 10 (1), 13-16. (doi:10.1016/S1386-9477(01)00044-3).

Record type: Article

Abstract

Ultrafast optical methods are used to study low temperature nuclear spin polarisation and electron spin precession and relaxation in an oblique magnetic field in undoped GaAs/AlGaAs quantum wells. We find that electron localisation dramatically extends electron spin relaxation and accelerates nuclear spin polarisation which is manifest as a large time-dependent Overhauser shift in electron Larmor precession frequency. Nuclear polarisation is a two-stage process, which we suggest involves contact hyperfine interaction at electron localisation centres and nuclear spin diffusion to the remaining nuclei of the sample. Special samples are used to investigate nuclear spin diffusion through the barriers, which is found to be an order of magnitude slower than within the wells, consistent with extra dipolar and quadrupolar disorder in the alloy.

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More information

Published date: May 2001
Keywords: quantum wells, hyperfine interaction, spin dynamics

Identifiers

Local EPrints ID: 37685
URI: http://eprints.soton.ac.uk/id/eprint/37685
ISSN: 1386-9477
PURE UUID: 91efa799-be62-42e7-8875-7c725c7fab2e

Catalogue record

Date deposited: 25 May 2006
Last modified: 08 Jan 2022 15:55

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Contributors

Author: A. Malinowski
Author: M.A. Brand
Author: R.T. Harley

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