期刊论文

Chen, Xue-Kun;Chen, Ke-Qiu

英文

Applied Physics Letters

0003-6951

2018

113

12

121906

10.1063/1.5053233

National Key Research and Development Program of China [2017YFB0701602]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11674092, 11704112, 11747121]; Hunan Provincial Natural Science Foundation of ChinaNatural Science Foundation of Hunan Province [2017JJ2062, 2018JJ3421]; Planned Science and Technology Project of Hunan Province [2015JC3107]; Scientific Research Fund of Hunan Provincial Education DepartmentHunan Provincial Education Department [15C0360]; Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics

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Using non-equilibrium molecular dynamics simulations, we investigate thermal rectification (TR) in pristine/branched graphene nanoribbon (GNR) junctions. The results indicate that the TR ratio of such junctions can reach 470% under small temperature bias, which has distinct superiority over asymmetric GNR and many other junctions. Moreover, the TR ratio decreases rapidly as the applied temperature bias increases. It seems to be against common sense that the TR ratio generally increases with temperature bias. Phonon spectra analyses reveal that ...