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Energy-dependent electron-electron scattering and spin dynamics in a two-dimensional electron gas

Energy-dependent electron-electron scattering and spin dynamics in a two-dimensional electron gas
Energy-dependent electron-electron scattering and spin dynamics in a two-dimensional electron gas
The measurement of spin dynamics of electrons in a degenerate two-dimensional electron gas, wherein the Dyakonov–Perel mechanism is dominant, has been used to investigate the electron scattering time (tp*) as a function of energy near the Fermi energy. Close to the Fermi energy, the spin evolution is oscillatory, which indicates a quasicollision-free regime of spin dynamics. As the energy is increased, a transition to an exponential, collision-dominated spin decay occurs. The oscillation frequency and the value of tp* are extracted by using a Monte Carlo simulation method. At the Fermi energy, tp* is very close to the ensemble momentum relaxation time (tp) obtained from the electron mobility. For higher energies, tp* falls quadratically, which is consistent with the theoretical expectations for the onset of the electron-electron scattering, which is inhibited by the Pauli principle at the Fermi energy.
1550-235X
205321-[4pp]
Leyland, W.J.H.
e6a7d9aa-be90-41ef-90db-bc411363b84b
Harley, R.T.
54613031-f60f-45f4-9b20-e49bcfd53b77
Henini, M.
dffaac17-caab-4a18-9eb6-c858d8bb1ed2
Shields, A.J.
2d016dc0-78a3-4368-9f54-49b00f381a2d
Farrer, I.
8e39904e-2255-4432-be5b-1b46c5b0dd9a
Ritchie, D.A.
83562b7e-0986-4822-9cfe-8c4ac95596c7
Leyland, W.J.H.
e6a7d9aa-be90-41ef-90db-bc411363b84b
Harley, R.T.
54613031-f60f-45f4-9b20-e49bcfd53b77
Henini, M.
dffaac17-caab-4a18-9eb6-c858d8bb1ed2
Shields, A.J.
2d016dc0-78a3-4368-9f54-49b00f381a2d
Farrer, I.
8e39904e-2255-4432-be5b-1b46c5b0dd9a
Ritchie, D.A.
83562b7e-0986-4822-9cfe-8c4ac95596c7

Leyland, W.J.H., Harley, R.T., Henini, M., Shields, A.J., Farrer, I. and Ritchie, D.A. (2008) Energy-dependent electron-electron scattering and spin dynamics in a two-dimensional electron gas. Physical Review B, 77 (20), 205321-[4pp]. (doi:10.1103/PhysRevB.77.205321).

Record type: Article

Abstract

The measurement of spin dynamics of electrons in a degenerate two-dimensional electron gas, wherein the Dyakonov–Perel mechanism is dominant, has been used to investigate the electron scattering time (tp*) as a function of energy near the Fermi energy. Close to the Fermi energy, the spin evolution is oscillatory, which indicates a quasicollision-free regime of spin dynamics. As the energy is increased, a transition to an exponential, collision-dominated spin decay occurs. The oscillation frequency and the value of tp* are extracted by using a Monte Carlo simulation method. At the Fermi energy, tp* is very close to the ensemble momentum relaxation time (tp) obtained from the electron mobility. For higher energies, tp* falls quadratically, which is consistent with the theoretical expectations for the onset of the electron-electron scattering, which is inhibited by the Pauli principle at the Fermi energy.

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Published date: May 2008

Identifiers

Local EPrints ID: 64280
URI: http://eprints.soton.ac.uk/id/eprint/64280
ISSN: 1550-235X
PURE UUID: b87b2450-d380-462d-b68a-3629fbb3da1d

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Date deposited: 12 Jan 2009
Last modified: 07 Jan 2022 22:36

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Contributors

Author: W.J.H. Leyland
Author: R.T. Harley
Author: M. Henini
Author: A.J. Shields
Author: I. Farrer
Author: D.A. Ritchie

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