Journal
APPLIED PHYSICS LETTERS
Volume 113, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5053233
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Funding
- National Key Research and Development Program of China [2017YFB0701602]
- National Natural Science Foundation of China [11674092, 11704112, 11747121]
- Hunan Provincial Natural Science Foundation of China [2017JJ2062, 2018JJ3421]
- Planned Science and Technology Project of Hunan Province [2015JC3107]
- Scientific Research Fund of Hunan 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 the observed phenomena stem from the local resonance of longitudinal phonons in branched GNR region under negative temperature bias. Furthermore, the influence of ambient temperature, system length, branch number, and defect density is studied to obtain the optimum conditions for TR. This work extends local resonance mechanism to GNR for thermal signal manipulation. Published by AIP Publishing.
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