1. Supercurrent rectification and magnetochiral effects in symmetric Josephson junctions
- Author
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Denis Kochan, Sergei Gronin, Simon Reinhardt, Nicola Paradiso, Tyler Lindemann, Lorenz Fuchs, Paulo E. Faria Junior, Geoffrey C. Gardner, Christoph Strunk, Christian Baumgartner, Jaroslav Fabian, Michael J. Manfra, and Andreas Costa
- Subjects
Superconductivity ,Physics ,Josephson effect ,Condensed matter physics ,Supercurrent ,ddc:530 ,Biomedical Engineering ,Bioengineering ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Condensed Matter Physics ,530 Physik ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010305 fluids & plasmas ,Magnetic field ,Inductance ,Rectification ,Condensed Matter::Superconductivity ,0103 physical sciences ,General Materials Science ,Electrical and Electronic Engineering ,010306 general physics ,Quantum well ,Diode - Abstract
Transport is non-reciprocal when not only the sign, but also the absolute value of the current depends on the polarity of the applied voltage. It requires simultaneously broken inversion and time-reversal symmetries, for example, by an interplay of spin–orbit coupling and magnetic field. Hitherto, observation of nonreciprocity was tied to resistivity, and dissipationless non-reciprocal circuit elements were elusive. Here we engineer fully superconducting non-reciprocal devices based on highly transparent Josephson junctions fabricated on InAs quantum wells. We demonstrate supercurrent rectification far below the transition temperature. By measuring Josephson inductance, we can link the non-reciprocal supercurrent to an asymmetry of the current–phase relation, and directly derive the supercurrent magnetochiral anisotropy coefficient. A semiquantitative model explains well the main features of our experimental data. Non-reciprocal Josephson junctions have the potential to become for superconducting circuits what pn junctions are for traditional electronics, enabling new non-dissipative circuit elements. Diodes exhibit non-reciprocal current–voltage relations, that is, the resistivity depends on the direction of the current flow. Now an array of Josephson junctions with large spin–orbit interaction acts as the superconducting version of a diode, where dissipation-free supercurrent flows in one direction, but not the other.
- Published
- 2021