Many-Body Effect in Spin Dephasing in n-Type GaAs Quantum Wells
WENG Ming-Qi1,2, WU Ming-Wei1,2
1Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026
2Department of Physics, University of Science and Technology of China, Hefei 230026 (mailing address)
Many-Body Effect in Spin Dephasing in n-Type GaAs Quantum Wells
WENG Ming-Qi1,2;WU Ming-Wei1,2
1Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026
2Department of Physics, University of Science and Technology of China, Hefei 230026 (mailing address)
Abstract： By constructing and numerically solving the kinetic Bloch equations we perform a many-body study of the spin dephasing due to the D'yakonov--Perel’ effect in n-type GaAs (100) quantum wells for high temperatures. In our study, we include the spin-conserving scattering such as the electron--phonon, the electron--nonmagnetic impurity as well as the electron--electron Coulomb scattering into consideration. The dephasing obtained from our theory contains both the single-particle and the many-body contributions with the latter originating from the inhomogeneous broadening introduced by the DP term [J. Supercond.: Incorp. Novel Magn. 14(2001)245; Eur. Phys. J. B 18(2000)373]. Our result agrees very well with the experimental data [Phys. Rev. B 62(2000)13034] of Malinowski et al. We further show that in the case we study, the spin dephasing is dominated by the many-body effect.
2005, Vol. 22 
