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Theory of generalized Josephson effects
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The DC Josephson effect is the flow of supercurrent across a weak link between two superconductors with a different value of their order parameter, the phase. We generalize this notion to any kind of spontaneous continuous symmetry breaking. The quantity that flows between the two systems is identified as the Noether current associated with the broken symmetry. The AC Josephson effect is identified as the oscillations due to the energy difference between the two systems caused by an imposed asymmetric chemical potential. 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.
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An Introduction to Spontaneous Symmetry Breaking
A comprehensive review that frames spontaneous symmetry breaking through singular limits and stable broken-symmetry states, suitable for graduate teaching.
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