论文标题
在超导接近结构中，声子通过声子冷却
Electron cooling by phonons in superconducting proximity structures
论文作者
论文摘要
我们研究了无序电子系统中的电子 - 音波冷却能力，特别关注介观超导接近结构。采用准经典的Keldysh Green的函数方法，我们获得了电子 - 音波耦合中冷却能扰动的一般表达，但对于均衡的任意电子系统有效。我们将理论应用于几个无序的电子系统，这对于由于杂质散射而导致的热声子波长与电子均值自由路径之间的任意关系有效。除了恢复大量正常金属和BCS超导体的已知结果外，我们考虑了两个实验相关的超导体金属接近触点的几何形状。这两种结构都具有与准片谱中的微型PAP有关的低温下的抑制作用。这种改进的隔离低冷却功能与高可调性结合使用，使这种结构高度有前途的量子量热量法
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. Besides 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
