Asymmetric quantum shot noise in magnon transport Article Swipe
YOU?
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· 2019
· Open Access
·
· DOI: https://doi.org/10.1103/physrevb.99.134403
· OA: W2924425471
We study a frequency-dependent noise-to-current ratio for asymmetric,\nsymmetric, and noncommutative current-noise in a ferromagnetic insulating\njunction, and extract quantum-mechanical properties of magnon transport at low\ntemperatures. We demonstrate that the noncommutative noise, vanished in the\ndc-limit (i.e., a classical regime), increases monotonically as a function of\nfrequency, and show that the noncommutative noise associated directly with\nquantum fluctuations of magnon currents breaks through the classical upper\nlimit determined by the symmetric noise and realizes asymmetric quantum shot\nnoise. Finally, we show that our theoretical predictions are within\nexperimental reach with current device and measurement scheme while exploiting\nlow temperatures. Our work provides a platform toward experimental access to\nquantum fluctuations of magnon currents.\n
