含双T形量子结构的量子波导中声学声子输运和热导  

Acoustic phonon transport and thermal conductance in quantum waveguide with abrupt quantum junctions modulated with double T-shaped quantum structure

作　　者：彭小芳[1] 陈丽群[1] 罗勇锋[1] 刘凌虹[1] 王凯军[1] 

机构地区：[1]中南林业科技大学理学院,长沙410004

出　　处：《物理学报》2013年第5期349-355,共7页Acta Physica Sinica

基　　金：湖南省教育厅青年项目(批准号:12B136);中南林业科技大学人才引进计划(批准号:104-0160)资助的课题~~

摘　　要：采用散射矩阵方法,研究了含双T形量子结构的量子波导中声学声子输运和热导性质.结果表明:在极低温度,双T形量子结构能增强低温热导;相反地,在相对较高的温度范围,双T形量子结构能降低低温热导.而在整个低温范围内,增加散射区域最窄处的宽度能增强低温热导.计算结果表明可以通过调节含双T形量子结构的量子波导结构来调控声子的输运概率和热导.By using the scattering matrix method, the transmission coefficient and thermal conductance of acoustic phonon through a quan- tum waveguide with abrupt quantum junctions modulated with double T-shaped quantum structure at low temperatures are studied. The results show that at very low temperatures, the double T-shaped quantum structure can enhance low-temperature thermal conductance; contrarily, at higher temperatures, the double T-shaped quantum structure can reduce low-temperature thermal conductance. However, in the whole low-temperature region, the low-temperature thermal conductance can be enhanced by adding the narrowest width c in the scattering region. Moreover, it is found that both the transmission coefficient and thermal conductance can be adjusted by changing the structural parameters of the the scattering region.

关 键 词：声学声子输运 热导 量子结构 

分 类 号：O469[理学—凝聚态物理]