arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.14391cond-mat.str-elcond-mat.mes-hallcond-mat.quant-gashep-th
收藏

量子霍尔双层中的去禁闭金属-绝缘体相变

Deconfined Metal-Insulator Transitions in Quantum Hall Bilayers

Liujun Zou, Debanjan Chowdhury

AI总结:

提出量子霍尔双层在磁长度尺度周期势下可实现去禁闭金属-绝缘体相变,通过单参数调谐连续演化,临界点具有无准粒子的费米面,并讨论绝缘体拓扑性质。

摘要:

我们提出,在存在磁长度尺度周期势的量子霍尔双层中,可以承载去禁闭金属-绝缘体相变(DMIT)的实例,其中具有一般电子费米面的费米液体(FL)金属通过连续量子相变演化为有能隙的绝缘体(或具有戈德斯通模的绝缘体)。该相变可通过调节单一参数实现,其普适临界性质可在受控框架下理解。在相变点,两层有效退耦,每层经历从FL到广义复合费米液体(gCFL)的连续相变。gCFL的热力学和输运性质与通常的CFL相似,但其谱性质在定性上不同。FL-gCFL量子临界点具有清晰定义的费米面,但没有长寿命的电子准粒子。紧邻相变另一侧,两层gCFL不稳定,会形成绝缘相。我们讨论了该绝缘体的拓扑性质以及与DMIT相关的各种可观测特征。

英文摘要:

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.

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。

↑