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

• 来源期刊: 中国物理B（英文版）
• 关键词: Green's function method phonon transport multi-terminal systems
• 年，卷（期）: 2019,（12）
• 页码范围: 238-245
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab4d3e

摘要

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.