Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 55: Superconductivity: Tunnelling and Josephson Junctions

TT 55.7: Vortrag

Donnerstag, 19. März 2020, 11:30–11:45, HSZ 204

Josephson and Andreev transport in a superconducting single electron transistor with a normal lead (SSN SET) — •Laura Sobral Rey1,2, Susanne Sprenger1, and Elke Scheer1,21Physics department, University of Konstanz, 78464, Konstanz, Germany — 2QuESTech consortium

An island coupled via a tunnel barrier to two leads and a gate forms a single electron transistor (SET) that shows Coulomb blockade. All-superconducting SETs (SSS-SETs) have shown to enable multitude of possible charge transport processes which are not well understood, in particular in the strong-coupling regime [1]. To disentangle these processes, we study here the conceptually simpler SSN-SET, which has never been investigated experimentally before.

The SSN-SETs studied here consist of an S island coupled to an N lead via an oxide tunnel barrier, and to an S lead with a mechanically controlled break junction (MCBJ). Via the MCBJ, different coupling regimes can be tuned: from a tunnel contact when the MCBJ is broken to a point contact when it is closed. In that limit the MCBJ accommodates a small number of highly transmissive transport channels.

For weak coupling our experimental findings can be understood in terms of the orthodox theory [2]. For stronger couplings, we observe Andreev and Josephson transport, as well as a renormalization for the charging energy and dynamical coulomb blockade, which are also observed in the N state.

[1] T. Lorenz, J. Low Temp. Phys. 191, 301 (2017).

[2] R. J. Fitzgerald, Phys. Rev. B 57, R11073(R) (1997)

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