SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Poster Session: Superconductivity
TT 5.18: Poster
Montag, 27. September 2021, 13:30–16:00, P
Electron cooling by phonons in mesoscopic superconducting systems — •Danilo Nikolic1, Denis M. Basko2, and Wolfgang Belzig1 — 1Fachbereich Physik, Universität Konstanz, D-78467 Konstanz, Germany — 2Université Grenoble Alpes and CNRS, LPMMC, 25 Rue des Martyrs, 38042 Grenoble, France
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.
This project has received funding from the EU Horizon 2020 program (Marie Sklodowska-Curie action QuESTech 766025).
[1] D. Nikolić, D. M. Basko, W. Belzig, Phys. Rev. B 102, 214514 (2020)