Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session RR09: V: Strongly Correlated Systems, Including Quantum Fluids and Solids IV
11:30 AM–1:30 PM,
Tuesday, March 21, 2023
Room: Virtual Room 9
Sponsoring
Unit:
DCMP
Chair: Néstor Massa, CONICET-Univ Nac of La Plata
Abstract: RR09.00008 : Breaking down the magnonic Wiedemann-Franz law in the hydrodynamic regime*
12:54 PM–1:06 PM
Presenter:
Ryotaro Sano
(Kyoto University)
Author:
Ryotaro Sano
(Kyoto University)
Recent experiments on ultrapure ferromagnetic insulators have opened up new pathways for magnon hydrodynamics. Hydrodynamic magnon transport implies exhibiting extraordinary features as well as electron hydrodynamics and has a potential for innovative functionalities beyond the conventional non-interacting magnon picture. However, the direct observation of magnon fluids remains an open issue due to the lack of probes to access the time and length scales characteristics of this regime.
In this work, we derive a set of coupled hydrodynamic equations for a magnon fluid and study the spin and thermal conductivities by focusing on the most dominant time scales. We also reveal that the ratio between the two conductivities in the hydrodynamic regime shows a large deviation from the standard form so-called the magnonic WF law.
*JSPS KAKENHI (Grants JP 22J20221)
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