Cyclotron effect on coherent spin precession of two-dimensional electrons

Abstract

We investigate the spin dynamics of high-mobility two-dimensional electrons in GaAs/AlGaAs quantum wells grown along the $[001]$ and $[110]$ directions by time-resolved Faraday rotation at low temperatures. In measurements on the $(001)$-grown structures without external magnetic fields, we observe coherent oscillations of the electron spin polarization about the effective spin-orbit field. In non-quantizing magnetic fields applied normal to the sample plane, the cyclotron motion of the electrons rotates the effective spin-orbit field. This rotation leads to fast oscillations in the spin polarization about a non-zero value and a strong increase in the spin dephasing time in our experiments. These two effects are absent in the $(110)$-grown structure due to the different symmetry of its effective spin-orbit field. The measurements are in excellent agreement with our theoretical model.

4 pages, 3 figures

References in corpus (8)

• Spin noise spectroscopy in GaAs (110) quantum wells: Access to intrinsic spin lifetimes and equilibrium electron dynamics
• Effect of initial spin polarization on spin dephasing and electron g factor in a high-mobility two-dimensional electron system
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• Oscillatory D'yakonov-Perel' spin dynamics in two dimensional electron gases
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• Effect of structure anisotropy on low temperature spin dynamics in quantum wells
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Cited by in corpus (12)

• Spin dynamics in semiconductors
• Coherent spin dynamics of electrons and excitons in nanostructures
• Duality of the spin and density dynamics for two-dimensional electrons with a spin-orbit coupling
• Anisotropic spin relaxation revealed by resonant spin amplification in (110) GaAs quantum wells
• Spin dephasing and photoinduced spin diffusion in high-mobility 110-grown GaAs-AlGaAs two-dimensional electron systems
• Spin polarization, dephasing and photoinduced spin diffusion in (110)-grown two-dimensional electron systems
• Theory of the inverse spin galvanic effect in quantum wells
• Long-lived nanosecond spin coherence in high-mobility 2DEGs confined in double and triple quantum wells
• Tailoring multilayer quantum wells for spin devices
• Anisotropic spin dynamics in antiferromagnets with a nonrelativistic spin splitting
• Electron spin dephasing in two-dimensional systems with anisotropic scattering
• Spin-orbit Hanle effect in high-mobility quantum wells