三终端原子环的弹道热整流

发布时间：2018-08-09 09:13

【摘要】：提出并通过非平衡格林函数法验证了一个弹道热整流理论模型——以原子环为中心散射区,非对称连接三条半无限长原子链作为左热极、控制热极和右热极.对三终端六元环结构的计算发现控制热极与左右热极之间的声子透射率有显著差异.左右热极之间的热整流比随着温差的增加而显著上升,正向热流可以达到反向热流的几倍以上.另外对该模型中弹道热整流的形成机理也做了详细说明.
[Abstract]:A theoretical model of ballistic thermal rectification is proposed and verified by the non-equilibrium Green's function method, in which three semi-infinite atomic chains are unsymmetrically connected as left heat poles, which control the thermal poles and the right thermal poles, taking the atomic ring as the central scattering region and asymmetrically connecting three semi-infinite atomic chains as the left heat poles. It is found that there is a significant difference in phonon transmittance between the control thermal pole and the left and right thermal pole by the calculation of the three-terminal six-member ring structure. The ratio of heat rectification between the left and right heat poles increases significantly with the increase of the temperature difference, and the forward heat flux can be more than several times that of the reverse heat flux. In addition, the formation mechanism of ballistic thermal rectification in this model is explained in detail.
【作者单位】：南京林业大学机械电子工程学院;
【基金】：国家自然科学基金(51376094)
【分类号】：O562

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