Polarization resolved analysis of phonon transport in a multi-terminal system

doi:10.1088/1674-1056/ab4d3e

Abstract The atomistic Green's function method is improved to compute the polarization resolved phonon transport in a multi-terminal system. Based on the recent developments in literature, the algorithm is simplified. The complex phonon band structure of a semi-infinite periodic terminal is obtained by the generalized eigenvalue equation. Then both the surface Green's function and phonon group velocity in the terminal are determined from the wave modes propagating away from the scattering region along the terminal. With these key ingredients, the individual phonon mode transmittance between the terminals can be calculated. The feasibility and validity of the method are demonstrated by the chain example compared with the wave packet method, and an example of graphene nanojunction with three terminals.

Keywords: Green' s function method phonon transport multi-terminal systems

Received: 16 June 2019
Revised: 13 August 2019
Accepted manuscript online:

PACS:	44.10.+i	(Heat conduction)
	63.20.D-	(Phonon states and bands, normal modes, and phonon dispersion)
	63.22.-m	(Phonons or vibrational states in low-dimensional structures and nanoscale materials)
	81.05.ue	(Graphene)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51376094) and Jiangsu Overseas Visiting Scholar Program for University Prominent Young & Middle-aged Teachers and Presidents, China.

Corresponding Authors: Yun-Feng Gu
E-mail: gu_yunfeng@sina.com

Cite this article:

Yun-Feng Gu(顾云风), Liu-Tong Zhu(朱留通), Xiao-Li Wu(吴晓莉) Polarization resolved analysis of phonon transport in a multi-terminal system 2019 Chin. Phys. B 28 124401

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