Shot Noise Induced by Nonequilibrium Spin Accumulation

Abstract

When an electric current passes across a potential barrier, the partition process of electrons at the barrier gives rise to the shot noise, reflecting the discrete nature of the electric charge. Here we report the observation of excess shot noise connected with a spin current which is induced by a nonequilibrium spin accumulation in an all-semiconductor lateral spin-valve device. We find that this excess shot noise is proportional to the spin current. Additionally, we determine quantitatively the spin-injection-induced electron temperature by measuring the current noise. Our experiments show that spin accumulation driven shot noise provides a novel means of investigating nonequilibrium spin transport.

arXiv comment5 pages and Supplemental Material

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Cited by in corpus (22)

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• Shot Noise in Mesoscopic Systems: from Single Particles to Quantum Liquids
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• Towards Noise Simulation in Interacting Nonequilibrium Systems Strongly Coupled to Baths
• Charge, spin, and heat shot noises in the absence of average currents: Conditions on bounds at zero and finite frequencies
• Quantum Fluctuation of the Quantum Geometric Tensor and its Manifestation as Intrinsic Hall Signatures in Time-Reversal Invariant Systems
• Spatial and energy resolution of electronic states by shot noise
• Heat-mode excitation in a proximity superconductor
• Noise insights into electronic transport
• Anomalous behavior of 1/f noise in graphene near the charge neutrality point
• What Can We Learn from Noise? -- Mesoscopic Nonequilibrium Statistical Physics --
• Noise in tunneling spin current across coupled quantum spin chains
• Spin relaxation 1/f noise in graphene
• Current noise geometrically generated by a driven magnet
• Current noise generated by spin imbalance in presence of spin relaxation
• Shot noise in magnetic tunneling structures with two-level quantum dots
• Detecting Spin Transport in Quantum Magnets with Photons
• Spin-flip noise due to nonequilibrium spin accumulation
• Continuous-Variable Entanglement Test in Driven Quantum Contacts
• Dynamics of Pure Spin Current in High-frequency Quantum Regime
• Bell-state correlations in current of local Fermi liquid