Coherent transport and manipulation of spins in indirect exciton nanostructures
arXiv:1408.4547 · doi:10.1103/PhysRevB.91.125302
Abstract
We report on the coherent control and transport of indirect exciton (IX) spins in GaAs double quantum well (DQW) nanostructures. The spin dynamics was investigated by optically generating spins using a focused, circularly polarized light spot and by probing their spatial distribution using spatially and polarization resolved photoluminescence spectroscopy. Optically injected exciton spins precess while diffusing over distances exceeding 20 μm from the excitation spot with a spatial precession frequency that depends on the spin transport direction as well as on the bias applied across the DQW structure. This behavior is attributed to the spin precession in the effective magnetic field induced by the spin-orbit interaction. From the dependence of the spin dynamics on the transport direction, bias and external magnetic fields we directly determined the Dresselhaus and Rashba spin splitting coefficients for the structure. The precession dynamics is essentially independent on the IX density, thus indicating that the long spin lifetimes are not associated with IX collective effects. The latter, together with the negligible contribution of holes to the spin dynamics, are rather attributed to spatial separation of the electron and hole wave functions by the electric field, which reduces the electron-hole exchange interaction. Coherent spin precession over long transport distances as well as the control of the spin vector using electric and magnetic fields open the way for the application of IX spins in the quantum information processing.
References in corpus (22)
- Spintronics: Fundamentals and applications
- Macroscopically ordered state in exciton system
- Spontaneous Coherence in a Cold Exciton Gas
- Mesoscopic spin confinement during acoustically induced transport
- Long-Distance Diffusion of Excitons in Double Quantum Well Structures
- Direct and indirect excitons in semiconductor coupled quantum wells in an applied electric field
- Drift mobility of long-living excitons in coupled GaAs quantum wells
- Spin Texture in a Cold Exciton Gas
- Spin currents in a coherent exciton gas
- Particle correlations and evidence for dark state condensation in a cold dipolar exciton fluid
- Spin transport of indirect excitons in GaAs coupled quantum wells
- Spin transport of indirect excitons
- Electric field control of spin-orbit splittings in GaAs/AlGaAs coupled quantum wells
- Dynamics of indirect exciton transport by moving acoustic fields
- Spin lifetimes and strain-controlled spin precession of drifting electrons in zinc blende type semiconductors
- Spin transfer and coherence in coupled quantum wells
- Remote Dipolar Interactions for Objective Density Calibration and Flow Control of Excitonic Fluids
- Absence of the Rashba effect in undoped asymmetric quantum wells
- Long exciton spin memory in coupled quantum wells
- Ballistic spin transport in exciton gases
- Electrical suppression of spin relaxation in GaAs(111)B Quantum Wells
- Coherent spin dynamics of an interwell excitons gas in GaAs/AlGaAs coupled quantum wells
Cited by in corpus (8)
- Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures
- Influence of magnetic quantum confined Stark effect on the spin lifetime of indirect excitons
- Remotely pumped GHz antibunched emission from single exciton centers in GaAs
- Adiabatic preparation of a cold exciton condensate
- Transition from spin-orbit to hyperfine dominated spin relaxation in a cold fluid of dipolar excitons
- Long-distance decay-less spin transport in indirect excitons in a van der Waals heterostructure
- Photoluminescence of double quantum wells: asymmetry and excitation laser wavelength effects
- Enhanced Edelstein effect and interdimensional effects in an electron gas with Rashba spin-orbit coupling interface