Electrical generation of pure spin currents in a two-dimensional electron gas
arXiv:0801.4021 · doi:10.1103/PhysRevLett.102.116802
Abstract
Pure spin currents are measured in micron-wide channels of GaAs two-dimensional electron gas (2DEG). Spins are injected and detected using quantum point contacts, which become spin polarized at high magnetic field. High sensitivity to the spin signal is achieved in a nonlocal measurement geometry, which dramatically reduces spurious signals associated with charge currents. Measured spin relaxation lengths range from 30 to 50 microns, much longer than has been reported in GaAs 2DEG's. The technique developed here provides a flexible tool for the study of spin polarization and spin dynamics in mesoscopic structures defined in 2D semiconductor systems.
References in corpus (6)
- Coherent control of a single electron spin with electric fields
- Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
- Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
- Non-diffusive spin dynamics in a two-dimensional electron gas
- Semiconductor few-electron quantum dot operated as a bipolar spin filter
- Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot