Breaking down the magnonic Wiedemann-Franz law in the hydrodynamic regime
arXiv:2208.14458 · doi:10.1103/PhysRevLett.130.166201
Abstract
Recent experiments have shown an indication of a hydrodynamic magnon behavior in ultrapure ferromagnetic insulators; however, its direct observation is still lacking. Here, we derive a set of coupled hydrodynamic equations and study the thermal and spin conductivities for such a magnon fluid. We reveal the drastic breakdown of the magnonic Wiedemann-Franz law as a hallmark of the hydrodynamics regime, which will become key evidence for the experimental realization of an emergent hydrodynamic magnon behavior. Therefore, our results pave the way towards the direct observation of magnon fluids.
7 pages, 1 figure, and supplemental material (13 pages)
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Cited by in corpus (4)
- Non-local magnon transconductance in extended magnetic insulating films.\\ Part I: spin diode effect
- Superballistic paradox in electron fluids: Evidence of tomographic transport
- Thermomagnetic anomalies in quantum magnon transport caused by tunable junction geometries in cold atomic systems
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