具有任意周期性的量子磁体中的广义约瑟夫森效应
Generalized Josephson effect with arbitrary periodicity in quantum magnets
AI总结：
该研究在量子磁体中发现了一种具有任意周期性的广义约瑟夫森效应，结合了多种整数周期性，超越了传统超导效应的周期性限制，并揭示了能量-相位关系与幻影螺旋的联系。
摘要：
易平面量子磁体与超导体惊人相似，允许产生自旋超电流以及源自其围绕z轴的U(1)旋转对称性的有效超导相位。我们发现了一种广义的分数约瑟夫森效应，其周期性与系统尺寸线性增加，在一维自旋-1/2链中选定各向异性及相位固定边界场下出现。该效应在一个系统中结合了任意整数周期性，超越了Majorana零模及其他奇异准粒子的超导约瑟夫森效应的4π和8π周期性。我们揭示了普遍的能量-相位关系，并将该效应与最近发现的幻影螺旋联系起来。
英文摘要：
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.
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