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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1

TT 14.8: Vortrag

Montag, 20. März 2017, 17:15–17:30, HSZ 201

Nonequilibrium effects in hybrid superconducting turnstiles — •Ivan Khaymovich — Max Planck Institute for Physics of Complex Systems, Dresden, Germany

Many superconducting micro- and nano-electronic devices operating at low temperatures suffer from the presence of non-equilibrium quasiparticles. The number of these quasiparticles increases rapidly with the increase in the operation frequencies above the threshold determined by the relaxation rate. Slowing down of the relaxation rate at low temperatures conflicts, thus, the performance of modern cryoelectronic devices such as qubit systems, superconducting resonators, turnstiles, and superconducting hybrid electron coolers.

In this project on the example of single-electron sources we present both new types of such devices immune to the quasiparticle poisoning and methods of effective control of excess quasiparticles in such single electronic systems, based on the quasiparticle trapping and untrapping by the magnetic field an its interplay with the inverse proximity effect. Most of theoretical predictions have been experimentally verified and the theory is in good agreement with experimental data.

[1] I. M. Khaymovich et al., Phys. Rev. B 92, 020501(R) (2015)

[2] M. Taupin, I. M. Khaymovich et al., Nat. Comm. 7: 10977 (2016)

[3] D. M. T. van Zanten et al., Phys. Rev. Lett. 116, 166801 (2016)

[4] I. M. Khaymovich, D. M. Basko, Phys. Rev. B 94, 165158 (2016)

[5] S. Nakamura et al., in preparation