| 放大和收窄量子波导中的声学声子输运和热导率 |
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| 引用本文： | 叶伏秋,彭小方.放大和收窄量子波导中的声学声子输运和热导率[J].吉首大学学报(自然科学版),2009,30(6):59-62. |
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| 作者姓名： | 叶伏秋 彭小方 |
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| 作者单位： | （1.吉首大学物理科学与信息工程学院，湖南 吉首 416000；2.湖南大学应用物理系，湖南 长沙 410082） |
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| 摘 要： | 运用散射矩阵方法，研究了在低温下量子波导宽度变化和长度L的变化对声学声子输运系数的影响.数值结果表明：当介电量子波导的宽度变化不大时，声学声子透射系数几乎不随宽度变化长度L的变化而变化；当介电量子波导的宽度变化比较大时，声学声子透射系数随长度L的增大而增大；当温度很低时，介电量子波导的宽度变化对热导率几乎没有影响，当温度升高时，热导率随长度L的增大而增大.
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| 关 键 词： | 声子输运 热导率 散射矩阵法 |
Acoustic-Phonon Transmission and Thermal Conductance in a Width-Change Quantum Waveguide |
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| YE Fu-qiu,PENG Xiao-fang.Acoustic-Phonon Transmission and Thermal Conductance in a Width-Change Quantum Waveguide[J].Journal of Jishou University(Natural Science Edition),2009,30(6):59-62. |
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| Authors: | YE Fu-qiu PENG Xiao-fang |
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| Institution: | (1.College of Physics Science & Information Engineering,Jishou University,Jishou 416000,Hunan China;2.Department of Applied Physics,Hunan University,Changsha 410082,China) |
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| Abstract: | The authors investigate the effect of the value change of L on low temperature phonon transport in a width-change quantum waveguide by using the scattering-matrix method.The calculated results show that the transmission coefficient almost doesn’t change when the width of the quantum waveguide changes small,but it will become large with the value increase of L when the width of the quantum waveguide changes more.And at low temperature,the thermal conductance almost doesn’t change with the width-change of the quantum waveguide,but it will become large with the value increase of L when the temperature hoists. |
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| Keywords: | phonon transport thermal conductance scattering-matrix method |
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