Long exciton spin memory in coupled quantum wells

Abstract

Spatially indirect excitons in a coupled quantum well structure were studied by means of polarization and time resolved photoluminescence. A strong degree of circular polarization (> 50%) in emission was achieved when the excitation energy was tuned into resonance with the direct exciton state. The indirect transition remained polarized several tens of nanoseconds after the pumping laser pulse, demonstrating directly a very long relaxation time of exciton spin. The observed spin memory effect exceeds the radiative lifetime of the indirect excitons.

4 pages, 2 figures

References in corpus (2)

• Drift mobility of long-living excitons in coupled GaAs quantum wells
• Spin transport of indirect excitons

Cited by in corpus (12)

• Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures
• Forming and confining of dipolar excitons by quantizing magnetic fields
• Radiative lifetimes of dipolar excitons in double quantum-wells
• Coherent transport and manipulation of spins in indirect exciton nanostructures
• Optical probing in a bilayer dark-bright condensate system
• Influence of magnetic quantum confined Stark effect on the spin lifetime of indirect excitons
• Coherent exciton transport in semiconductors
• Transition from spin-orbit to hyperfine dominated spin relaxation in a cold fluid of dipolar excitons
• The Role of Spin-Flip Collisions in a Dark Exciton Condensate
• Weak-Light Nonlinearity Using a Dark State in Coupled Quantum Dots
• Detecting an exciton crystal by statistical means
• Giant Hyperfine Interaction between a Dark Exciton Condensate and Nuclei