Ultrafast spin evolution in high-mobility 2DEGs
Ultrafast spin evolution in high-mobility 2DEGs
We describe optical measurements of electron spin dynamics in a high-mobility n-doped GaAs/AlGaAs quantum well which test the customary assumptions of the D'yakonov, Perel’ and Kachorovskii mechanism of electron spin relaxation. At 1.8 K, spin evolution is oscillatory indicating breakdown of collision-dominated relaxation. At higher temperatures spin evolution is exponential but extracted scattering times deviate strongly from transport momentum relaxation times. This discrepancy can be ascribed to electron–electron scattering previously overlooked as a contributor to spin relaxation.
spin relaxation, spin-precession, 2DEG, momentum scattering
324-328
Harley, R.T.
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Brand, M.A.
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Malinowski, A.
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Karimov, O.Z.
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Marsden, P.A.
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Shields, A.J.
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Sanvitto, D.
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Ritchie, D.A.
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Simmons, M.Y.
afb0d316-8916-4911-a356-14182e79545e
2003
Harley, R.T.
54613031-f60f-45f4-9b20-e49bcfd53b77
Brand, M.A.
cb12b5d6-fd96-4aa8-86b5-1f9ed2a96483
Malinowski, A.
54fd31d4-b510-4726-a8cd-33b6b2ad0427
Karimov, O.Z.
e5137e05-4b16-484e-aae8-952a6fd69da4
Marsden, P.A.
4a0ef10a-358b-4b0f-95b2-c314731712aa
Shields, A.J.
2d016dc0-78a3-4368-9f54-49b00f381a2d
Sanvitto, D.
78c820d7-04fe-4970-a87c-bd5ec607f7b9
Ritchie, D.A.
83562b7e-0986-4822-9cfe-8c4ac95596c7
Simmons, M.Y.
afb0d316-8916-4911-a356-14182e79545e
Harley, R.T., Brand, M.A., Malinowski, A., Karimov, O.Z., Marsden, P.A., Shields, A.J., Sanvitto, D., Ritchie, D.A. and Simmons, M.Y.
(2003)
Ultrafast spin evolution in high-mobility 2DEGs.
Physica E: Low-dimensional Systems and Nanostructures, 17 (1-4), .
(doi:10.1016/s1386-9477(02)00825-1).
Abstract
We describe optical measurements of electron spin dynamics in a high-mobility n-doped GaAs/AlGaAs quantum well which test the customary assumptions of the D'yakonov, Perel’ and Kachorovskii mechanism of electron spin relaxation. At 1.8 K, spin evolution is oscillatory indicating breakdown of collision-dominated relaxation. At higher temperatures spin evolution is exponential but extracted scattering times deviate strongly from transport momentum relaxation times. This discrepancy can be ascribed to electron–electron scattering previously overlooked as a contributor to spin relaxation.
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Published date: 2003
Keywords:
spin relaxation, spin-precession, 2DEG, momentum scattering
Identifiers
Local EPrints ID: 57293
URI: http://eprints.soton.ac.uk/id/eprint/57293
ISSN: 1386-9477
PURE UUID: 17704b1a-353c-4b27-98de-49e706f05da4
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Date deposited: 13 Aug 2008
Last modified: 15 Mar 2024 11:06
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Contributors
Author:
R.T. Harley
Author:
M.A. Brand
Author:
A. Malinowski
Author:
O.Z. Karimov
Author:
P.A. Marsden
Author:
A.J. Shields
Author:
D. Sanvitto
Author:
D.A. Ritchie
Author:
M.Y. Simmons
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