Quantized thermal conductance at low temperatures in quantum wire with catenoidal contacts

被引：51

作者：

Peng, Xiao-Fang ^{[1
,2
]}

Chen, Ke-Qiu ^{[1
,2
]}

Wan, Qing ^{[1
,2
]}

Zou, B. S. ^{[1
,2
]}

Duan, Wenhui ^{[3
]}

机构：

[1] Hunan Univ, Minist Educ, Key Lab Micro Nano Optoelect Devices, Changsha 410082, Hunan, Peoples R China

[2] Hunan Univ, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China

[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 19期

基金：

中国国家自然科学基金;

关键词：

TRANSPORT;

D O I：

10.1103/PhysRevB.81.195317

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermal conductance associated with the lowest six types of ballistic phonon modes in quantum wire with catenoidal contacts is investigated. The results show that the cutoff frequency for the four types of acoustic modes is zero while two types of optical modes are of nonzero cutoff frequency. For a perfect quantum wire, a quantized thermal-conductance plateau can be observed. While for the structure with catenoidal contacts, the thermal-conductance plateau is broken and a decrease in thermal conductance appears. The results also show that the reduced thermal conductance contributed from different vibrational modes has different characteristics.

引用

页数：6

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