Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.51: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Quantum phase slip dynamics in Josephson junction chains — •Thomas Weissl¹, Iulian Matei¹, Ioan Mihai Pop¹, Florent Lecocq¹, Christoph Schenke², Gianluca Restelli², Frank W. Hekking², Olivier Buisson¹, and Wiebke Guichard¹ — ¹Institut Néel, CNRS/Université Joseph Fourier, Grenoble, France — ²LPMMC, CNRS/Université Joseph Fourier, Grenoble, France

In contrast to Josephson Junctions (JJ) which show a tunneling of superconducting charge carriers, phase-slip junctions are characterized by a tunneling of the superconducting phase. It has been shown theoretically¹ that phase-slip junctions can be realized by including a JJ in a high impedance environment or by using a long chain of JJ’s. Phase-slip junctions could have an important metrological application, as under microwave irradiation they are expected to show plateaus of constant current at multiples of the applied microwave frequency. This frequency to current conversion could be used to implement a current standard. We present measurements of the current voltage characteristics of JJ chains of different lengths. For shorter chains we observe a zero current state that we attribute to quantum phase-slip dynamics² in the chain. A superconducting like behavior is observed for longer chain that we understand by taking into account the excitation of standing electromagnetic waves in the chain.
W.Guichard and F.W. Hekking Phys. Rev. B 81, 064508 (2010)
I. Pop et al Nature Physics 6, 589-592 (2010)