Doppler velocimetry of spin propagation in a two-dimensional electron gas
arXiv:1208.3493 · doi:10.1038/nphys2157
Abstract
Controlling the flow of electrons by manipulation of their spin is a key to the development of spin-based electronics. While recent demonstrations of electrical-gate control in spin-transistor configurations show great promise, operation at room temperature remains elusive. Further progress requires a deeper understanding of the propagation of spin polarization, particularly in the high mobility semiconductors used for devices. Here we report the application of Doppler velocimetry to resolve the motion of spin-polarized electrons in GaAs quantum wells driven by a drifting Fermi sea. We find that the spin mobility tracks the high electron mobility precisely as a function of T. However, we also observe that the coherent precession of spins driven by spin-orbit interaction, which is essential for the operation of a broad class of spin logic devices, breaks down at temperatures above 150 K for reasons that are not understood theoretically.
References in corpus (18)
- Spintronics: Fundamentals and applications
- Non-ballistic spin field-effect transistor
- An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System
- Emergence of the persistent spin helix in semiconductor quantum wells
- Spin Hall effect transistor
- Theory of Spin-Charge Coupled Transport in a Two-Dimensional Electron Gas with Rashba Spin-Orbit Interactions
- Observation of spin Coulomb drag in a two-dimensional electron gas
- Imaging spin flows in semiconductors subject to electric, magnetic, and strain fields
- Spin diffusion in doped semiconductors
- Non-diffusive spin dynamics in a two-dimensional electron gas
- Enhanced spin relaxation time due to electron-electron scattering in semiconductors
- Spin relaxation in a generic two-dimensional spin-orbit coupled system
- Diffusion equation and spin drag in spin-polarized transport
- Spin Coulomb drag in the two-dimensional electron liquid
- Spin diffusion in doped semiconductors: the role of Coulomb interactions
- Relaxation mechanisms of the persistent spin helix
- Measurement of electron-hole friction in an n-doped GaAs/AlGaAs quantum well using optical transient grating spectroscopy
- Spin polarization in biased Rashba-Dresselhaus two-dimensional electron systems
Cited by in corpus (21)
- Direct mapping of the formation of a persistent spin helix: Supplementary information
- Transport in inhomogeneous quantum critical fluids and in the Dirac fluid in graphene
- Persistent Skyrmion Lattice of Noninteracting Electrons with Spin-Orbit Coupling
- Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids
- Tutorial: Characterizing Microscale Energy Transport in Materials with Transient Grating Spectroscopy
- Effect of anisotropic spin absorption on the Hanle effect in lateral spin valves
- Coherent Propagation of Spin Helices in a Quantum-Well Confined Electron Gas
- Transition of a 2D spin mode to a helical state by lateral confinement
- Gate control of the spin mobility through the modification of the spin-orbit interaction in two-dimensional systems
- Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids
- Intrinsic exciton transport and recombination in single-crystal lead bromide perovskite
- Short-time Spin Dynamics in Strongly Correlated Few-fermion Systems
- Ambipolar spin transport in (111) GaAs quantum wells
- Direct imprinting of arbitrary spin textures using programmable structured light in a semiconductor two-dimensional electron gas
- Evolution of the persistent spin helix in the presence of Hartree-Fock fields
- Collective Spin-Hall Effect for Electron-Hole Gratings
- Ultrafast spin dynamics in the proximate quantum spin liquid α-RuCl3
- Microscopic theory for the Doppler velocimetry of spin propagation in semiconductor quantum wells
- Dressed excitations, thermodynamics and relaxation in the 1D XXZ Heisenberg model
- A perspective on inelastic light scattering spectroscopy for probing transport of collective acoustic excitations
- Nonlinear spin-Wave Doppler effect for flexible tuning of magnonic frequencies