Transition from spin-orbit to hyperfine dominated spin relaxation in a cold fluid of dipolar excitons
arXiv:1706.00861 · doi:10.1103/PhysRevB.96.085404
Abstract
We measure the spin-resolved transport of dipolar excitons in a biased GaAs double quantum well structure. From these measurements we extract both spin lifetime and mobility of the excitons. We find that below a temperature of K, there is a sharp increase in the spin lifetime of the excitons, together with a sharp reduction in their mobility. Below a critical power the spin lifetime increases with increasing mobility and density, while above the critical power the opposite trend is observed. We interpret this transition as an evidence of the interplay between two different spin dephasing mechanisms: at low mobility the dephasing is dominated by the hyperfine interaction with the lattice nuclei spins, while at higher mobility the spin-orbit interaction dominates, and a Dyakonov-Perel spin relaxation takes over. The excitation power and temperature regime where the hyperfine interaction induced spin dephasing is observed correlates with the regime where a dark dipolar quantum liquid was reported recently on a similar sample.
References in corpus (28)
- Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
- Emergence of the persistent spin helix in semiconductor quantum wells
- Spontaneous Coherence in a Cold Exciton Gas
- Low-temperature spin relaxation in n-type GaAs
- Analysis of the exciton-exciton interaction in semiconductor quantum wells
- Bose-Einstein condensation in semiconductors: the key role of dark excitons
- Long-Distance Diffusion of Excitons in Double Quantum Well Structures
- Quantum diffusion of dipole-oriented indirect excitons in coupled quantum wells
- Evidence for a Bose-Einstein condensate of excitons
- Spin Texture in a Cold Exciton Gas
- Spin currents in a coherent exciton gas
- Exciton Liquid in Coupled Quantum Wells
- Particle correlations and evidence for dark state condensation in a cold dipolar exciton fluid
- Spin relaxation of localized electrons in n-type semiconductors
- Electrostatic traps for dipolar excitons
- Spin transport of indirect excitons in GaAs coupled quantum wells
- Spin transport of indirect excitons
- A dark incompressible dipolar liquid of excitons
- Nonlinear dynamics of a dense two-dimensional dipolar exciton gas
- Spin transfer and coherence in coupled quantum wells
- Nonlinear optical spectroscopy of indirect excitons in biased coupled quantum wells
- Long exciton spin memory in coupled quantum wells
- Correlations in a two-dimensional Bose gas with long range interactions
- Measurement of exciton correlations using electrostatic lattices
- Radiative lifetimes of dipolar excitons in double quantum-wells
- Coherent transport and manipulation of spins in indirect exciton nanostructures
- Influence of magnetic quantum confined Stark effect on the spin lifetime of indirect excitons
- Condensation to a strongly correlated dark fluid of two dimensional dipolar excitons