Disorder-Driven Multifractality Transition in Weyl Nodal Loops.,Physical Review Letters

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Disorder-Driven Multifractality Transition in Weyl Nodal Loops.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-04-03 , DOI: 10.1103/physrevlett.124.136405
Miguel Gonçalves ₁ , Pedro Ribeiro _{1,

2} , Eduardo V Castro _{2,

3} , Miguel A N Araújo _{1,

2,

4}

Affiliation

The effect of short-range disorder in nodal line semimetals is studied by numerically exact means. For arbitrary small disorder, a novel semimetallic phase is unveiled for which the momentum-space amplitude of the ground-state wave function is concentrated around the nodal line and follows a multifractal distribution. At a critical disorder strength, a semimetal to compressible metal transition occurs, coinciding with a multi- to single-fractality transition. The universality class of this critical point is characterized by the correlation length and dynamical exponents. At considerably higher disorder, an Anderson metal-insulator transition takes place. Our results show that the nature of the semimetallic phase in nonclean samples is fundamentally different from a clean nodal semimetal.

中文翻译：

Weyl节点环中的无序驱动多重分形过渡。

通过数值精确的方法研究了节点线半金属中短程无序的影响。对于任意小的无序现象，揭示了一种新型的半金属相，其基态波函数的动量空间幅度集中在节点线周围并遵循多重分形分布。在临界无序强度下，会发生从半金属到可压缩金属的过渡，这与多至单分数形的过渡一致。此临界点的通用性类别的特征在于相关长度和动力学指数。在更高的无序状态下，会发生安德森金属-绝缘体转变。我们的结果表明，非清洁样品中半金属相的性质与清洁节点半金属根本不同。

更新日期：2020-04-01

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