Ballistic spin transport in exciton gases
arXiv:1305.0133 · doi:10.1103/PhysRevB.88.195309
Abstract
Traditional spintronics relies on spin transport by charge carriers, such as electrons in semiconductor crystals. This brings several complications: the Pauli principle prevents the carriers from moving with the same speed; Coulomb repulsion leads to rapid dephasing of electron flows. Spin-optronics is a valuable alternative to traditional spintronics. In spin-optronic devices the spin currents are carried by electrically neutral bosonic quasi-particles: excitons or exciton-polaritons. They can form highly coherent quantum liquids and carry spins over macroscopic distances. The price to pay is a finite life-time of the bosonic spin carriers. We present the theory of exciton ballistic spin transport which may be applied to a range of systems where bosonic spin transport has been reported, in particular, to indirect excitons in coupled GaAs/AlGaAs quantum wells. We describe the effect of spin-orbit interaction of electrons and holes on the exciton spin, account for the Zeeman effect induced by external magnetic fields, long range and short range exchange splittings of the exciton resonances. We also consider exciton transport in the non-linear regime and discuss the definitions of exciton spin current, polarization current and spin conductivity.
16 pages, 10 figures to be published in Phys. Rev. B
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Cited by in corpus (14)
- Topological Polaritons and Excitons in Garden Variety Systems
- Interference dislocations in condensate of indirect excitons
- Effects of fermion exchanges on the polarization of exciton condensates
- Pancharatnam-Berry phase in condensate of indirect excitons
- Roton-maxon spectrum and instability for weakly interacting dipolar excitons in a semiconductor layer
- Effect of uniaxial stress on the interference of polaritonic waves in wide quantum wells
- Azimuthons and pattern formation in annularly confined exciton-polariton Bose-Einstein condensates
- Nonlinear Optical Probe of Indirect Excitons
- Coherent transport and manipulation of spins in indirect exciton nanostructures
- Bose condensation of direct excitons in an off-resonant cavity at elevated temperatures
- Vortices in spinor cold exciton condensates with spin-orbit interaction
- Proposal for frequency-selective photodetector based on the resonant photon drag effect in a condensate of indirect excitons
- Anisotropic superfluidity of two-dimensional excitons in a periodic potential
- Hanle model of a spin-orbit coupled Bose-Einstein condensate of excitons in semiconductor quantum wells