Generalized Josephson effect with arbitrary periodicity in quantum magnets
arXiv:2408.04008 · doi:10.1103/PhysRevResearch.7.013272
Abstract
Easy-plane quantum magnets are strikingly similar to superconductors, allowing for spin supercurrent and an effective superconducting phase stemming from their rotation symmetry around the -axis. We uncover a generalized fractional Josephson effect with a periodicity that increases linearly with system size in one-dimensional spin- chains at selected anisotropies and phase-fixing boundary fields. The effect combines arbitrary integer periodicities in a single system, exceeding the and periodicity of superconducting Josephson effects of Majorana zero modes and other exotic quasiparticles. We reveal a universal energy-phase relation and connect the effect to the recently discovered phantom helices.
11 pages, 5 figures, 2 ancillary videos
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