Phonon scattering and thermal conductance properties in two coupled graphene nanoribbons modulated with bridge atoms |
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Institution: | Department of Applied Physics, Hunan University, Key Lab for Micro–Nano Physics and Technology of Hunan Province, Changsha 410082, China |
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Abstract: | The phonon scattering and thermal conductance properties have been studied in two coupled graphene nanoribbons connected by different bridge atoms by using density functional theory in combination with non-equilibrium Green's function approach. The results show that a wide range of thermal conductance tuning can be realized by changing the chemical bond strength and atom mass of the bridge atoms. It is found that the chemical bond strength (bridge atom mass) plays the main role in phonon scattering at low (high) temperature. A simple equation is presented to describe the relationship among the thermal conductance, bridge atom, and temperature. |
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