Josephson effects in one-dimensional supersolids
Masaya Kunimi, Yuki Nagai, Yusuke Kato
DOI 10.1103/PhysRevB.84.094521 · Physical Review B
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Abstract
We demonstrate that superflow past an obstacle is possible in a solid phase in the one-dimensional Gross-Pitaevskii equation with a finite-range two-body interaction. The phenomenon we find is analogous to the dc Josephson effect in superconductors, and we deduce the “Josephson relation” between the current and phase difference of the condensates separated by the obstacle. We also discuss persistent currents and nonclassical rotational inertia in annular containers with a penetrable potential barrier. The phase diagram in the plane of the current and the interaction strength is given. Our result provides a simple theoretical example of supersolidity in the presence of an obstacle.
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