Generalized Josephson effect with arbitrary periodicity in quantum magnets
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911310515535872 |
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| author | Tripathi, Anshuman Gerken, Felix Schmitteckert, Peter Thorwart, Michael Trif, Mircea Posske, Thore |
| author_facet | Tripathi, Anshuman Gerken, Felix Schmitteckert, Peter Thorwart, Michael Trif, Mircea Posske, Thore |
| contents | Easy-plane quantum magnets are strikingly similar to superconductors, allowing for spin supercurrent and an effective superconducting phase stemming from their $U(1)$ rotation symmetry around the $z$-axis. We uncover a generalized fractional Josephson effect with a periodicity that increases linearly with system size in one-dimensional spin-$1/2$ chains at selected anisotropies and phase-fixing boundary fields. The effect combines arbitrary integer periodicities in a single system, exceeding the $4π$ and $8π$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04008 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Generalized Josephson effect with arbitrary periodicity in quantum magnets Tripathi, Anshuman Gerken, Felix Schmitteckert, Peter Thorwart, Michael Trif, Mircea Posske, Thore Strongly Correlated Electrons Superconductivity Quantum Physics Easy-plane quantum magnets are strikingly similar to superconductors, allowing for spin supercurrent and an effective superconducting phase stemming from their $U(1)$ rotation symmetry around the $z$-axis. We uncover a generalized fractional Josephson effect with a periodicity that increases linearly with system size in one-dimensional spin-$1/2$ chains at selected anisotropies and phase-fixing boundary fields. The effect combines arbitrary integer periodicities in a single system, exceeding the $4π$ and $8π$ 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. |
| title | Generalized Josephson effect with arbitrary periodicity in quantum magnets |
| topic | Strongly Correlated Electrons Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2408.04008 |