The Joint Condensed Matter Seminar (JCMS) series is organised by KTH Royal Insitute of Technology, Nordita, and Stockholm University.
On Thursday, January 12th, 2023 from 13 to 14 we will host a seminar by Felix von Oppen from Freie Universität Berlin.
Diode effects in current-biased Josephson junctions
Current flow in electronic devices can be asymmetric with bias direction, a phenomenon underlying the utility of diodes and known as non-reciprocal charge transport. The promise of dissipationless electronics has recently stimulated the quest for superconducting diodes. Non-reciprocal Josephson junctions are particularly promising for device applications, for instance in the context of superconducting qubits. In this talk, I will discuss a recent experiment, in which non-reciprocity is observed as the result of introducing a single magnetic atom into the Josephson junction and use this as a starting point for developing a general theory of non-reciprocal transport in current-biased Josephson junctions. This will include a discussion of the symmetry requirements underlying non-reciprocal transport. I will also briefly describe a generalized derivation of the Keldysh action of Josephson junctions, which incorporates non-reciprocity.