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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Electron cooling by phonons in superconducting proximity structures
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Electron cooling by phonons in superconducting proximity structures

机译：通过声子的电子冷却超导邻近结构

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摘要

We investigate the electron-phonon cooling power in disordered electronic systems with a special focus on mesoscopic superconducting proximity structures. Employing the quasiclassical Keldysh Green's function method, we obtain a general expression for the cooling power perturbative in the electron-phonon coupling but valid for arbitrary electronic systems out of equilibrium. We apply our theory to several disordered electronic systems valid for an arbitrary relation between the thermal phonon wavelength and the electronic mean-free path due to impurity scattering. In addition to recovering the known results for bulk normal metals and BCS superconductors, we consider two experimentally relevant geometries of superconductor-normal metal proximity contacts. Both structures feature a significantly suppressed cooling power at low temperatures related to the existence of a minigap in the quasiparticle spectrum. This improved isolation low cooling feature in combination with the high tunability makes such structures highly promising candidates for quantum calorimetry.
机译：我们研究了混乱的电子系统中的电子 - 声子冷却功率，特别侧重于介于介观超导邻近结构。采用拟卡西斯keldysh绿色的功能方法，我们获得了电子 - 声子耦合中的冷却功率扰动的一般表达式，而是有效地用于均衡的任意电子系统。我们将我们的理论应用于几种无序的电子系统，该系统有效地用于导致由于杂质散射引起的热声波长和电子均值路径之间的任意关系。除了恢复散装正常金属和BCS超导体的已知结果之外，我们考虑两个实验相关的超导体正常金属邻近触点几何形状。两个结构在与Quasiplicle谱中存在的MiniGAP存在相关的低温下，两个结构都具有显着抑制的冷却功率。这种改进的隔离低冷却特征与高可调性结合使得该结构具有对量子量热法的高度有前途的候选者。

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