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arXiv 1902.07407cond-mat.str-elcond-mat.mes-hallcond-mat.supr-conhep-th
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一阶量子相变中2+ 1维超对称性的量子尺度出现

Finite-Scale Emergence of 2+1D Supersymmetry at First-Order Quantum Phase Transition

Jiabin Yu, Radu Roiban, Shao-Kai Jian, Chao-Xing Liu

摘要:

超对称性是费米子和玻色子之间的对称性,它提供了标准模型的一个有希望的扩展,但仍然缺乏实验证据。最近,由于超对称性在连续量子相变中的潜在出现,凝聚态学界对超对称性产生了浓厚的兴趣。在这项工作中,我们证明了2+1D超对称,大规模的马约拉纳和伊辛场,可能会出现在一阶量子相变的伊辛磁化通过调整一个单一的参数。尽管由于相关质量的存在,超对称性的出现只允许在有限的尺度范围内,但当标度前的质量很小时,超对称性的尺度范围可以很大。我们发现,超对称性的出现是伴随着拓扑相变的马约拉纳字段,其非零质量的改变的符号,但保持的幅度。提出了一种实验实现这种情况下使用的表面态的3+1D的时间反转不变的拓扑超导体与表面磁性掺杂。

英文摘要:

Supersymmetry, a symmetry between fermions and bosons, provides a promising extension of the standard model but is still lack of experimental evidence. Recently, the interest in supersymmetry arises in the condensed matter community owing to its potential emergence at the continuous quantum phase transition. In this work, we demonstrate that 2+1D supersymmetry, relating massive Majorana and Ising fields, might emerge at the first-order quantum phase transition of the Ising magnetization by tuning a single parameter. Although the emergence of the SUSY is only allowed in a finite range of scales due to the existence of relevant masses, the scale range can be large when the masses before scaling are small. We show that the emergence of supersymmetry is accompanied by a topological phase transition for the Majorana field, where its non-zero mass changes the sign but keeps the magnitude. An experimental realization of this scenario is proposed using the surface state of a 3+1D time-reversal invariant topological superconductor with surface magnetic doping.

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