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Frontiers of Physics

ISSN 2095-0462

ISSN 2095-0470(Online)

CN 11-5994/O4

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Front. Phys.    2009, Vol. 4 Issue (3) : 420-425    https://doi.org/10.1007/s11467-009-0056-0
RESEARCH ARTICLE
Thermal transport associated with ballistic phonons in asymmetric quantum structures
Zong-liang LIU (刘宗良)1,2, Xiao-yan YU (于晓燕)2, Ke-qiu CHEN (陈克求)2()
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 π2kB2/(3h) can be observed at very low temperatures. However, for asymmetric quantum structure, the thermal conductance is less than the universal value π2kB2/(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.
Keywords phonon in nanoscale structure      ballistic transport      thermal conductance     
Corresponding Author(s): null,Email:keqiuchen@hnu.cn   
Issue Date: 05 September 2009
 Cite this article:   
Zong-liang LIU (刘宗良),Xiao-yan YU (于晓燕),Ke-qiu CHEN (陈克求). Thermal transport associated with ballistic phonons in asymmetric quantum structures[J]. Front. Phys. , 2009, 4(3): 420-425.
 URL:  
https://academic.hep.com.cn/fop/EN/10.1007/s11467-009-0056-0
https://academic.hep.com.cn/fop/EN/Y2009/V4/I3/420
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