Is spontaneous vortex generation in superconducting 4Hb-TaS2 from vison-vortex nucleation with $\mathbb{Z}_{2}$ topological order?

Rui Leonard Luo, Gang V. Chen
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Abstract

We propose the superconducting van der Waals material 4Hb-TaS2 to realize the \(\mathbb{Z}_{2}\) topological order and interpret the recent discovery of the spontaneous vortex generation in 4Hb-TaS2 as the vison-vortex nucleation. For the alternating stacking of metallic/superconducting and Mott insulating layers in 4Hb-TaS2, we expect the local moments in the Mott insulating 1T-TaS2 layer to form the \(\mathbb{Z}_{2}\) topological order. The spontaneous vortex generation in 4Hb-TaS2 is interpreted from the transition or nucleation between the superconducting vortex and the \(\mathbb{Z}_{2}\) vison in different phase regimes. Differing from the single vison-vortex nucleation in the original Senthil–Fisher’s cuprate proposal, we consider such nucleation process between the superconducting vortex lattice and the vison crystal. We further propose experiments to distinguish this proposal with the \(\mathbb{Z}_{2}\) topological order from the chiral spin liquid scenarios.

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超导 4Hb-TaS2 中的自发涡旋生成是否来自具有 $\mathbb{Z}_{2}$ 拓扑秩序的可见涡核?
我们提出用超导范德华材料4Hb-TaS2来实现(\mathbb{Z}_{2}\)拓扑秩序,并将最近在4Hb-TaS2中发现的自发涡旋生成解释为可见涡核。对于4Hb-TaS2中金属/超导层和莫特绝缘层的交替堆积,我们预计莫特绝缘的1T-TaS2层中的局部力矩会形成\(\mathbb{Z}_{2}\)拓扑秩序。4Hb-TaS2中自发涡旋的产生可以解释为超导涡旋和(\mathbb{Z}_{2}\)视子在不同相态下的过渡或成核。有别于森蒂尔-费舍尔杯石方案中的单一粘子-漩涡成核,我们考虑的是超导漩涡晶格与粘子晶体之间的成核过程。我们进一步提出了一些实验来区分这个具有(\mathbb{Z}_{2}\)拓扑阶的方案与手性自旋液体方案。
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