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Spin current cross-correlations as a probe of magnon coherence

Bender, Scott A.; Kamra, Akashdeep; Belzig, Wolfgang; Duine, Rembert
Peer reviewed, Journal article
Published version
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https://hdl.handle.net/11250/2650282
Utgivelsesdato
2019
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  • Institutt for fysikk [1839]
  • Publikasjoner fra CRIStin - NTNU [21889]
Originalversjon
Physical Review Letters. 2019, 122 .   10.1103/PhysRevLett.122.187701
Sammendrag
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.
Utgiver
American Physical Society
Tidsskrift
Physical Review Letters

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