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arXiv 1602.08172cond-mat.str-el
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两阶梯Majorana费米子晶格中的三临界Ising相变

Tricritical Ising phase transition in two-ladder Majorana fermion lattice

Xiaoyu Zhu, Marcel Franz

摘要:

我们介绍了一个两个梯形晶格模型与相互作用的马约拉纳费米子,可以实现的表面上的拓扑绝缘体薄膜。我们研究这个模型的分析和数值技术相结合,并找到一个相图,具有无间隙和有间隙的阶段,以及有趣的相变,包括在三临界伊辛(TCI)普适性类的量子临界点。后者发生在一个中间的耦合强度在一阶过渡线和伊辛临界线的交汇点,并被称为是由一个超共形场论与中心荷$c =\frac{7}{10}$。我们讨论了实验的可行性,构建模型和调整参数的TCI点附近的签名的难以捉摸的超对称性可以观察到。

英文摘要:

We introduce a two-ladder lattice model with interacting Majorana fermions that could be realized on the surfaces of a topological insulator film. We study this model by a combination of analytical and numerical techniques and find a phase diagram that features both gapless and gapped phases as well as interesting phase transitions including a quantum critical point in the tricritical Ising (TCI) universality class. The latter occurs at an intermediate coupling strength at a meeting point of a first-order transition line and an Ising critical line and is known to be described by a superconformal field theory with central charge $c =\frac{7}{10}$. We discuss the experimental feasibility of constructing the model and tuning parameters to the vicinity of the TCI point where signatures of the elusive supersymmetry can be observed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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