Volume 92, Number 4, November 2010
|Number of page(s)
|Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
|10 December 2010
Effect of nonequilibrium phonons on hot-electron spin relaxation in n-type GaAs quantum wells
Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China - Hefei, Anhui, 230026, China
Accepted: 9 November 2010
We study the effect of nonequilibrium longitudinal optical phonons on hot-electron spin relaxation in n-type GaAs quantum wells. The longitudinal optical phonons are driven to nonequilibrium states by electrons under an in-plane electric field. The nonequilibrium phonons then in turn influence the electron spin relaxation properties via modifying the electron heating and drifting. When the longitudinal optical phonons are treated as the nonequilibrium rather than the equilibrium ones, the spin relaxation time is increased since the electron heating is enhanced and hence the electron-phonon scattering is strengthened. Meanwhile, the frequency of spin precession, which is roughly proportional to the electron drift velocity, can be either increased or decreased. The former happens in the case with low electric field and/or high lattice temperature, whereas the latter happens in the case with high electric field and/or low lattice temperature. The nonequilibrium phonon effect is more pronounced when the electron density is high and the impurity density is low.
PACS: 72.25.Rb – Spin relaxation and scattering / 71.10.-w – Theories and models of many-electron systems / 63.20.kd – Phonon-electron interactions
© EPLA, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.