Electrical generation of pure spin currents in a two-dimensional electron gas

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 (20)

• Spintronics: Fundamentals and applications
• Electronic spin transport and spin precession in single graphene layers at room temperature
• Direct electronic measurement of the spin Hall effect
• Coherent control of a single electron spin with electric fields
• Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
• Possible Spin Polarization in a One-Dimensional Electron Gas
• Gate-Controlled Spin-Orbit Quantum Interference Effects in Lateral Transport
• Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
• Spin separation in cyclotron motion
• Suppression of Spin Relaxation in Submicron InGaAs Wires
• Generating Spin Currents in Semiconductors with the Spin Hall Effect
• Spontaneous spin polarization in quantum point contacts
• Detecting Spin-Polarized Currents in Ballistic Nanostructures
• Non-diffusive spin dynamics in a two-dimensional electron gas
• Semiconductor few-electron quantum dot operated as a bipolar spin filter
• A Thermometer for the 2D Electron Gas using 1D Thermopower
• Shot-Noise Signatures of 0.7 Structure and Spin in a Quantum Point Contact
• Magnetic-field dependence of electron spin relaxation in n-type semiconductors
• Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot
• Resonant spin polarization and spin current in a two-dimensional electron gas

Cited by in corpus (28)

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• Observation of second-harmonic generation induced by pure spin currents
• Spin polarized current and shot noise in carbon nanotube quantum dot in the Kondo regime
• Lateral spin-orbit interaction and spin polarization in quantum point contacts
• Generation and Detection of Spin Currents in Semiconductor Nanostructures with Strong Spin-Orbit Interaction
• Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
• Beating in electronic transport through quantum dot based devices
• Spin-to-Charge Conversion of Mesoscopic Spin Currents
• Polarized currents and spatial separation of Kondo state: NRG study of spin-orbital effect in a double QD
• Theory of frequency-dependent spin current noise through correlated quantum dots
• Spin-flip reflection at the normal metal-spin superconductor interface
• Theory of a.c. spin current noise and spin conductance through a quantum dot in the Kondo regime I: The equilibrium case
• Fluctuations of spin transport through chaotic quantum dots with spin-orbit coupling
• Non-linear spin to charge conversion in mesoscopic structures
• Spin-current quantization in a quantum point contact with spin-orbit interaction
• Numerical study of resonant spin relaxation in quasi-1D channels
• Ballistic spin resonance in multisubband quantum wires
• Enhancement mechanism of the electron g-factor in quantum point contacts
• Spin polarization oscillations without spin precession: spin-orbit entangled resonances in quasi-one-dimensional spin transport
• Effects of interaction on field-induced resonances in confined Fermi liquid
• Optimal Single Quantum Dot Heat-to-pure-spin-current Converters
• Metastable and spin-polarized states in electron systems with localized electron-electron interaction
• Gate voltage control over spin relaxation length
• Measurement of spin-dependent conductivities in a two-dimensional electron gas
• Boundary Conditions and Formation of Pure Spin Currents in Magnetic Field