Rashba-effect-induced spin dephasing in n-type InAs quantum wells

We perform a many-body investigation of the spin dephasing in n-type InAs quantum wells under moderate magnetic fields in the Voigt configuration by constructing and solving numerically the kinetic Bloch equations. We obtain the spin dephasing time due to the Rashba effect together with the spin-conserving scattering such as electron–phonon, electron–nonmagnetic impurity as well as electron–electron Coulomb scattering. By varying the initial spin polarization, temperature, impurity density, applied magnetic field and the interface electric field, we are able to study the spin dephasing time under various conditions. For the electron density and quantum well width that we study, the many-body effect dominates the spin dephasing. Moreover, we find an anomalous resonance peak in the spin dephasing time for high initial spin polarization under moderate magnetic fields.