论文标题
量子霍尔双层中的脱合金属绝缘体过渡
Deconfined Metal-Insulator Transitions in Quantum Hall Bilayers
论文作者
论文摘要
我们建议，在磁长度的规模上存在周期性潜力的情况下，量子霍尔双层可以容纳拆卸金属绝缘体过渡（DMIT）的例子，在那里，带有通用电子费米表面的费米液体（FL）金属会通过连续的量子转移到具有Goldstone Modes的绝缘剂（或通过连续的量子）转移。可以通过调整单个参数来访问过渡，并且可以使用受控框架来理解其通用关键属性。在过渡时，这两层被有效地解耦，其中每层从FL到广义复合费米液体（GCFL）进行连续过渡。 GCFL的热力学和运输特性与通常的CFL相似，而其光谱特性在质量上不同。 FL-GCFL量子临界点具有无长寿命的电子准粒子的明确定义的费米表面。在整个过渡过程中，GCFL的两层不稳定，无法形成绝缘阶段。我们讨论绝缘子的拓扑特性以及与DMIT相关的各种可观察的特性。
We propose that quantum Hall bilayers in the presence of a periodic potential at the scale of the magnetic length can host examples of a Deconfined Metal-Insulator Transition (DMIT), where a Fermi liquid (FL) metal with a generic electronic Fermi surface evolves into a gapped insulator (or, an insulator with Goldstone modes) through a continuous quantum phase transition. The transition can be accessed by tuning a single parameter, and its universal critical properties can be understood using a controlled framework. At the transition, the two layers are effectively decoupled, where each layer undergoes a continuous transition from a FL to a generalized composite Fermi liquid (gCFL). The thermodynamic and transport properties of the gCFL are similar to the usual CFL, while its spectral properties are qualitatively different. The FL-gCFL quantum critical point hosts a sharply defined Fermi surface without long-lived electronic quasiparticles. Immediately across the transition, the two layers of gCFL are unstable to forming an insulating phase. We discuss the topological properties of the insulator and various observable signatures associated with the DMIT.
