Energy-Dependent Electron-Electron Scattering and Spin Dynamics in a Two Dimensional Electron Gas

Details 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

2008-03-08

arxiv.org/abs/0803.1230v1

Physics

Condensed Matter

Other Condensed Matter

9 pages 3 figures

Scientific paper

Measurements of spin dynamics of electrons in a degenerate two dimensional electron gas, where the Dyakonov-Perel mechanism is dominant, have 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, indicating a quasi-collision-free regime of spin dynamics. As the energy is increased a transition to exponential, collision-dominated, spin decay occurs. The frequency and the value of tp* are extracted 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, consistent with theoretical expectations for the onset of electron-electron scattering which is inhibited by the Pauli principle at the Fermi energy.

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