Temperature and Electron Density Dependence of Spin Relaxation in GaAs/AlGaAs Quantum Well

Abstract

Temperature and carrier density dependent spin dynamics for GaAs/AlGaAs quantum wells (QWs) with different structural symmetry has been studied by using time-resolved Kerr rotation technique. The spin relaxation time is measured to be much longer for the symmetrically-designed GaAs quantum well comparing with the asymmetrical one, indicating the strong influence of Rashba spin-orbit coupling on spin relaxation. D'yakonov-Perel' (DP) mechanism has been revealed to be the dominant contribution for spin relaxation in GaAs/AlGaAs QWs. The spin relaxation time exhibits non-monotonic dependent behavior on both temperature and photo-excited carrier density, revealing the important role of non-monotonic temperature and density dependence of electron-electron Coulomb scattering. Our experimental observations demonstrate good agreement with recently developed spin relaxation theory based on microscopic kinetic spin Bloch equation approach.

17 pages, 4 figures

References in corpus (8)

• Spin dynamics in semiconductors
• Electron spin relaxation in bulk III-V semiconductors from a fully microscopic kinetic spin Bloch equation approach
• Spin relaxation in $n$-type GaAs quantum wells from a full microscopic approach
• Oscillatory D'yakonov-Perel' spin dynamics in two dimensional electron gases
• Spin relaxation due to the Bir-Aronov-Pikus mechanism in intrinsic and $p$-type GaAs quantum wells from a fully microscopic approach
• Effect of electron-electron scattering on spin dephasing in a high-mobility low-density twodimensional electron gas
• Density dependence of spin relaxation in GaAs quantum well at room temperature
• Comment on "Photon energy and carrier density dependence of spin dynamics in bulk CdTe crystal at room temperature"

Cited by in corpus (6)

• Electron spin relaxation due to D'yakonov-Perel' and Elliot-Yafet mechanisms in monolayer MoS${}_2$: Role of intravalley and intervalley processes
• Enhanced spin-orbit coupling and charge carrier density suppression in LaAl1-xCrxO3/SrTiO3 heterointerfaces
• Hole spin relaxation in $p$-type (111) GaAs quantum wells
• Hole spin relaxation in bilayer WSe${}_2$
• Multivalley spin relaxation in $n$-type bulk GaAs in the presence of high electric fields
• Spin-charge conversion in disordered two-dimensional electron gases lacking inversion symmetry