Spin Current Cross-Correlations as a Probe of Magnon Coherence.
Scott A. Bender,Akashdeep Kamra,Wolfgang Belzig,Rembert A. Duine,Rembert A. Duine,Rembert A. Duine +5 more
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TLDR
It is shown that the cross-correlations of pure spin currents injected by a ferromagnet into two metal leads, normalized by their dc value, replicate the behavior of g^{(2)} when magnons are driven far from equilibrium.Abstract:
Motivated by the important role of the normalized second-order coherence function, often called g^{(2)}, in the field of quantum optics, we propose a method to determine magnon coherence in solid-state devices. Namely, we show that the cross-correlations of pure spin currents injected by a ferromagnet into two metal leads, normalized by their dc value, replicate the behavior of g^{(2)} when magnons are driven far from equilibrium. We consider two scenarios: driving by ferromagnetic resonance, which leads to the coherent occupation of a single mode, and driving by heating of the magnons, which leads to an excess of incoherent magnons. We find an enhanced normalized cross-correlation in the latter case, thereby demonstrating bunching of nonequilibrium thermal magnons due to their bosonic statistics. Our results contribute to the burgeoning field of quantum magnonics, which seeks to explore and exploit the quantum nature of magnons.read more
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References
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Spintronics: Fundamentals and applications
TL;DR: Spintronics, or spin electronics, involves the study of active control and manipulation of spin degrees of freedom in solid-state systems as discussed by the authors, where the primary focus is on the basic physical principles underlying the generation of carrier spin polarization, spin dynamics, and spin-polarized transport.
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The Quantum Theory of Optical Coherence
TL;DR: In this paper, a succession of correlation functions for the complex field strengths is defined, and a fully coherent field is defined as one whose correlation functions satisfy an infinite succession of stated conditions.
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Spin Hall Effect
TL;DR: In this paper, it is proposed that when a charge current circulates in a paramagnetic metal, a transverse spin imbalance will be generated, giving rise to a spin Hall voltage, in the absence of charge current and magnetic field.
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Equivalence of semiclassical and quantum mechanical descriptions of statistical light beams
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Shot noise in mesoscopic conductors
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