Spin current cross-correlations as a probe of magnon coherence

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BENDER, Scott A., Akashdeep KAMRA, Wolfgang BELZIG, Rembert A. DUINE, 2018. Spin current cross-correlations as a probe of magnon coherence

@techreport{Bender2018-11-25T12:59:27Zcurre-44059, title={Spin current cross-correlations as a probe of magnon coherence}, year={2018}, author={Bender, Scott A. and Kamra, Akashdeep and Belzig, Wolfgang and Duine, Rembert A.} }

Bender, Scott A. Kamra, Akashdeep 2018-11-28T14:08:46Z eng Duine, Rembert A. Duine, Rembert A. Spin current cross-correlations as a probe of magnon coherence terms-of-use Kamra, Akashdeep 2018-11-28T14:08:46Z Belzig, Wolfgang Motivated by the important role of the normalized second order coherence function, often called g<sup>(2)</sup>, in the field of quantum optics, we propose a method to determine magnon coherence in solidstate 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<sup>(2)</sup> 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 crosscorrelation 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. Belzig, Wolfgang 2018-11-25T12:59:27Z Bender, Scott A.

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