Intrinsic Quantum Dissipation in Superconducting Weak Links |
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| Authors: | Artem V Galaktionov Dmitry S Golubev Andrei D Zaikin |
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| Affiliation: | 1.I.E. Tamm Department of Theoretical Physics,P.N. Lebedev Physical Institute,Moscow,Russia;2.Low Temperature Laboratory, Department of Applied Physics,Aalto University,Espoo,Finland;3.Institute of Nanotechnology,Karlsruhe Institute of Technology (KIT),Karlsruhe,Germany |
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| Abstract: | We evaluate the frequency spectrum for an intrinsic quantum dissipative environment for the Josephson phase φ formed by subgap Andreev bound states in superconducting weak links. We also analyze the problem of macroscopic quantum tunneling (MQT) of φ in highly transparent weak links and identify several MQT regimes. Within the exponential accuracy, we derive the expression for the supercurrent quantum decay rate both at low temperatures and in the vicinity of the quantum-to-classical crossover. |
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