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

Autor:	Leylanda, W. J. H., Harley, R. T., Henini, M., Shields, A. J., Farrer, I., Ritchie, D. A.
Rok vydání:	2008
Předmět:	Condensed Matter - Other Condensed Matter Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
Popis:	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. Comment: 9 pages 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0803.1230 Zobrazit plný text záznamu View this record from Arxiv