Thermal transport associated with ballistic phonons in asymmetric quantum structures |
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Authors: | Zong-liang Liu Xiao-yan Yu and Ke-qiu Chen |
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Institution: | (1) Department of Physics, Hunan Institute of Humanities, Science and Technology, Loudi, 417000, China;(2) Department of Applied Physics, Hunan University, Changsha, 410082, China |
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Abstract: | Using the scattering matrix method, we investigate the thermal conductance associated with ballistic phonons at low temperatures
in asymmetric quantum structures. The results show that when the structure is an ideal quantum wire, the universal value π
2
κ
B2(3h) can be observed at very low temperatures. However, for asymmetric quantum structure, the thermal conductance is less than
the universal value π
2
κ
B2(3h), even at T → 0. The results also show that the thermal conductance is strongly dependent on the transport direction. The rectification
effect can be observed in the asymmetric structure and can be adjusted by changing the structural parameters. A brief analysis
of these results is given.
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Keywords: | phonon in nanoscale structure ballistic transport thermal conductance |
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