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Thermal drag revisited: Boltzmann versus Kubo
- Publication Year :
- 2010
- Publisher :
- arXiv, 2010.
-
Abstract
- The effect of mutual drag between phonons and spin excitations on the thermal conductivity of a quantum spin system is discussed. We derive general expression for the drag component of the thermal current using both Boltzmann equation approach and Kubo linear-response formalism to leading order in the spin-phonon coupling. We demonstrate that aside from higher-order corrections which appear in the Kubo formalism both approaches yield identical results for the drag thermal conductivity. We discuss the range of applicability of our result and provide a generalization of our consideration to the cases of fermionic excitations and to anomalous forms of boson-phonon coupling. Several asymptotic regimes of our findings relevant to realistic situations are highlighted.<br />Comment: 14 pages, 3 figures, published version, extended discussion
- Subjects :
- Physics
Strongly Correlated Electrons (cond-mat.str-el)
Phonon
FOS: Physical sciences
Condensed Matter Physics
Boltzmann equation
Electronic, Optical and Magnetic Materials
Condensed Matter - Strongly Correlated Electrons
symbols.namesake
Thermal conductivity
Drag
Quantum electrodynamics
Quantum mechanics
Thermal
Boltzmann constant
symbols
Condensed Matter::Strongly Correlated Electrons
General expression
Spin (physics)
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....3148a175e95ca231beff565dd1c93356
- Full Text :
- https://doi.org/10.48550/arxiv.1006.3949