2008/03/08 by W. J. H. Leylanda, Leylanda, W. J. H., R. T. Harley +9
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Other Condensed Matter (cond-mat.other) #cond-mat.mes-hall #cond-mat.other
paper · pdf · doi:10.48550/arxiv.0803.1230
9 pages 3 figures
arxiv created 2008/03/08 · arxiv updated 2009/12/01
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.