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Supercurrent rectification and magnetochiral effects in symmetric Josephson junctions.
Christian Baumgartner1, Lorenz Fuchs1, Andreas Costa2
1Institut für Experimentelle und Angewandte Physik, University of Regensburg, Regensburg, Germany.
Nature Nanotechnology
|November 19, 2021
Summary
Researchers developed superconducting non-reciprocal devices using Josephson junctions. These devices demonstrate supercurrent rectification, paving the way for novel, non-dissipative electronic components in superconducting circuits.
Area of Science:
- Condensed Matter Physics
- Quantum Electronics
- Materials Science
Background:
- Nonreciprocity in transport requires broken inversion and time-reversal symmetries.
- Previous observations of nonreciprocity were linked to electrical resistance (resistivity).
- Dissipationless non-reciprocal circuit elements remained a significant challenge.
Purpose of the Study:
- To engineer fully superconducting non-reciprocal devices.
- To demonstrate supercurrent rectification in a dissipationless system.
- To explore the potential of Josephson junctions for creating novel superconducting circuit elements.
Main Methods:
- Fabrication of highly transparent Josephson junctions on InAs quantum wells.
- Measurement of supercurrent rectification below the critical temperature.
- Utilizing Josephson inductance measurements to analyze the current-phase relation.
Main Results:
- Demonstrated supercurrent rectification in fully superconducting devices.
- Linked non-reciprocal supercurrent to asymmetry in the current-phase relation.
- Derived the supercurrent magnetochiral anisotropy coefficient experimentally.
Conclusions:
- Engineered dissipationless non-reciprocal devices using Josephson junctions.
- Non-reciprocal Josephson junctions show promise for superconducting circuits.
- Potential to enable new non-dissipative circuit elements analogous to pn junctions.
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