Spin current cross-correlations as a probe of magnon coherence

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BENDER, Scott A., Akashdeep KAMRA, Wolfgang BELZIG, Rembert A. DUINE, 2019. Spin current cross-correlations as a probe of magnon coherence. In: Physical Review Letters. 122(18), 187701. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.122.187701

@article{Bender2019curre-44059.2, title={Spin current cross-correlations as a probe of magnon coherence}, year={2019}, doi={10.1103/PhysRevLett.122.187701}, number={18}, volume={122}, issn={0031-9007}, journal={Physical Review Letters}, author={Bender, Scott A. and Kamra, Akashdeep and Belzig, Wolfgang and Duine, Rembert A.}, note={Article Number: 187701} }

2019-05-10T13:53:37Z Bender, Scott A. Duine, Rembert A. Spin current cross-correlations as a probe of magnon coherence Bender, Scott A. terms-of-use 2019-05-10T13:53:37Z Duine, Rembert A. Belzig, Wolfgang eng Belzig, Wolfgang Kamra, Akashdeep 2019 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. Kamra, Akashdeep

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