Volume 103, Number 6, September 2013
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||22 October 2013|
Nonlinearity enhanced interfacial thermal conductance and rectification
1 Department of Physics and Centre for Computational Science and Engineering, National University of Singapore Singapore 117542, Republic of Singapore
2 Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University Xiamen 361005, PRC
3 NUS Graduate School for Integrative Sciences and Engineering - Singapore 117456, Republic of Singapore
4 Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, Tongji University 200092 Shanghai, PRC
Received: 24 July 2013
Accepted: 11 September 2013
We study the nonlinear interfacial thermal transport across atomic junctions by the quantum self-consistent mean-field (QSCMF) theory based on the nonequilibrium Green's function approach; the QSCMF theory we propose is very precise and matches well with the exact results from quantum master equation. The nonlinearity at the interface is studied by effective temperature-dependent interfacial coupling calculated from the QSCMF theory. We find that nonlinearity can provide an extra channel for phonon transport in addition to the phonon scattering which usually blocks heat transfer. For weak linearly coupled interface, the nonlinearity can enhance the interfacial thermal transport; with increasing nonlinearity or temperature, the thermal conductance shows nonmonotonical behavior. The interfacial nonlinearity also induces thermal rectification, which depends on the mismatch of the two leads and also the interfacial linear coupling.
PACS: 44.10.+i – Heat conduction / 68.35.-p – Solid surfaces and solid-solid interfaces: structure and energetics / 72.10.Di – Scattering by phonons, magnons, and other nonlocalized excitations
© EPLA, 2013
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