Ballistic Spin Resonance
arXiv:0811.1244 · doi:10.1038/nature07873
Abstract
The phenomenon of spin resonance has had far reaching influence since its discovery nearly 70 years ago. Electron spin resonance (ESR) driven by high frequency magnetic fields has informed our understanding of quantum mechanics, and finds application in fields as diverse as medicine and quantum information. Spin resonance induced by high frequency electric fields, known as electric dipole spin resonance (EDSR), has also been demonstrated recently. EDSR is mediated by spin-orbit interaction (SOI), which couples the spin degree of freedom and the momentum vector. Here, we report the observation of a novel spin resonance due to SOI that does not require external driving fields. Ballistic spin resonance (BSR) is driven by an internal spin-orbit field that acts upon electrons bouncing at gigaHertz frequencies in narrow channels of ultra-clean two-dimensional electron gas (2DEG). BSR is manifested in electrical measurements of pure spin currents as a strong suppression of spin relaxation length when the motion of electrons is in resonance with spin precession. These findings point the way to gate-tunable coherent spin rotations in ballistic nanostructures without external a.c. fields.
24 pages, including supplementary materials
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- Direct electronic measurement of the spin Hall effect
- Coherent control of a single electron spin with electric fields
- Orbital mechanisms of electron spin manipulation by an electric field
- Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
- Spin separation in cyclotron motion
- Detecting Spin-Polarized Currents in Ballistic Nanostructures
- Electric Dipole Induced Spin Resonance in Disordered Semiconductors
- Transverse Electron Focusing in Systems with Spin-Orbit Coupling
- Electrical generation of pure spin currents in a two-dimensional electron gas
- Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot
- Confinement-enhanced spin relaxation for electron ensembles in large quantum dots
Cited by in corpus (40)
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- CT invariant quantum spin Hall effect in a ferromagnetic graphene
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- Spin-flip reflection at the normal metal-spin superconductor interface
- Interplay between resonant tunneling and spin precession oscillations in all-electric all-semiconductor spin transistors
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- Theory of a.c. spin current noise and spin conductance through a quantum dot in the Kondo regime I: The equilibrium case
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- Spin-orbit coupling and resonances in the conductance of quantum wires
- Ballistic spin resonance in multisubband quantum wires
- Spin polarization oscillations without spin precession: spin-orbit entangled resonances in quasi-one-dimensional spin transport
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- Half-mirror for electrons on quantum Hall copropagating edge channels
- The influence of spin-flip scattering on the preparation and detection of a single spin state in a quantum dot attached to a spin battery
- Gate voltage control over spin relaxation length
- Measurement of spin-dependent conductivities in a two-dimensional electron gas