Two-Fluid Theory for Spin Superfluidity in Magnetic Insulators
Open Access
- 14 March 2016
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 116 (11), 117201
- https://doi.org/10.1103/physrevlett.116.117201
Abstract
We investigate coupled spin and heat transport in easy-plane magnetic insulators. These materials display a continuous phase transition between normal and condensate states that is controlled by an external magnetic field. Using hydrodynamic equations supplemented by Gross-Pitaevski phenomenology and magnetoelectric circuit theory, we derive a two-fluid model to describe the dynamics of thermal and condensed magnons, and the appropriate boundary conditions in a hybrid normal-metal–magnetic-insulator–normal-metal heterostructure. We discuss how the emergent spin superfluidity can be experimentally probed via a spin Seebeck effect measurement.Keywords
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Funding Information
- Stichting voor Fundamenteel Onderzoek der Materie
- ITP Foundation
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Ministerie van Onderwijs, Cultuur en Wetenschap
- National Science Foundation
- U.S. Department of Energy (DE-SC0012190)
- MRSEC (DMR-1420451)
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