Spin transfer and coherence in coupled quantum wells

Abstract

Spin dynamics of optically excited electrons confined in asymmetric coupled quantum wells are investigated through time resolved Faraday rotation experiments. The inter-well coupling is shown to depend on applied electric field and barrier thickness. We observe three coupling regimes: independent spin precession in isolated quantum wells, incoherent spin transfer between single-well states, and coherent spin transfer in a highly coupled system. Relative values of the inter-well tunneling time, the electron spin lifetime, and the Larmor precession period appear to govern this behavior.

13 pages, 4 figures

References in corpus (3)

• High temperature gate control of quantum well spin memory
• Gate-Controlled Electron Spin Resonance in a GaAs/AlGaAs Heterostructure
• Local Manipulation of Nuclear Spin in a Semiconductor Quantum Well

Cited by in corpus (11)

• Electrically tunable g-factors in quantum dot molecular spin states
• Structural, electrical, and magneto-optical characterization of paramagnetic GaMnAs quantum wells
• Antiferromagnetic s-d exchange coupling in GaMnAs
• Electron spin interferometry using a semiconductor ring structure
• Spin bottleneck in resonant tunneling through double quantum dots with different Zeeman splittings
• Nonlinear Optical Probe of Indirect Excitons
• Coherent transport and manipulation of spins in indirect exciton nanostructures
• Influence of magnetic quantum confined Stark effect on the spin lifetime of indirect excitons
• Transition from spin-orbit to hyperfine dominated spin relaxation in a cold fluid of dipolar excitons
• Nonequilibrium electron spin polarization in a double quantum dot. Lande mechanism
• Antibonding ground states in semiconductor artificial molecules