Quasiparticle relaxation in optically excited high-Q superconducting resonators.
Quasiparticle relaxation in optically excited high-Q superconducting resonators.
复制标题
光激发高Q值超导谐振器中的准粒子弛豫。
DOI：
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发表时间：
2008
影响因子：
8.6
通讯作者：
T. Klapwijk
中科院分区：
文献类型：
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作者：
R. Barends;J. Baselmans;S. Yates;Jiansong Gao;J. Hovenier;T. Klapwijk
利用复合电导率对光子通量的响应，测量了超导薄膜中准粒子的弛豫时间作为温度的函数。对于电子-声子耦合强度不同的钽和铝，我们发现在高温下，弛豫时间随着温度的降低而增加，这与电子-声子相互作用的预期一致。在低温下，我们发现两种超导材料的弛豫时间都达到饱和，这表明存在第二弛豫通道，而不是由于电子-声子相互作用。
The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response of the complex conductivity to photon flux. For tantalum and aluminum, chosen for their difference in electron-phonon coupling strength, we find that at high temperatures the relaxation time increases with decreasing temperature, as expected for electron-phonon interaction. At low temperatures we find in both superconducting materials a saturation of the relaxation time, suggesting the presence of a second relaxation channel not due to electron-phonon interaction.