Year: 2020
Type: article
Abstract: The DC Josephson effect is the flow of supercurrent across a weak link between two superconductors with different values of their order parameters, the phase. We formulate this notion for any kind of spontaneous continuous symmetry breaking. The quantity that flows between the two systems is the zero-wavenumber Noether current associated with the broken symmetry. The AC Josephson effect is the oscillation of current due to the energy difference between the two systems caused by an imposed asymmetric chemical potential of Noether charge. As an example of novel physics, a Josephson effect is predicted between two crystalline solids, potentially measurable as a force periodic in the separation distance.
DOI: 10.1093/ptep/ptaa088
Author: Aron J Beekman
Institutions: Keio University, The University of Osaka
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $979
OpenAlex ID: W2965040108