Entanglement spectrum edge reconstruction and correlation hole of the FQH liquids

TL;DR

This paper investigates how the entanglement spectrum of fractional quantum Hall states can undergo edge reconstruction, revealing a universal connection with the correlation hole characteristic of these topological states.

Contribution

It demonstrates that entanglement spectrum edge reconstruction occurs in FQH states and correlates with the intrinsic correlation hole, providing new insights into topological properties and edge behaviors.

Findings

Entanglement spectrum can undergo edge reconstruction.

Critical area of the subsystem matches the correlation hole.

Results are consistent across multiple FQH states.

Abstract

The edge of the electronic fractional quantum Hall (FQH) system obeys the law of the chiral Luttinger liquid theory due to its intrinsic topological properties and the relation of bulk-edge correspondence. However, in a realistic experimental system, such as the usual Hall bar setup, the soften of the background confinement potential can induce the reconstruction of the edge spectrum which breaks the chirality and universality of the FQH edge. The entanglement spectrum (ES) of the FQH ground state has the same counting structure as that in the energy spectrum indicating the topological characters of the quantum state. In this work, we report that the ES can also have an edge reconstruction while sweeping the area of the sub-system in real space cut. Moreover, we found the critical area of the sub-system matches accurately with the intrinsic building block of the fractional quantum Hall liquids, namely the correlation hole of the FQH liquids. The above results seem like be universal after our studying a series of typical FQH states, such as two Laughlin states at $\nu = 1/3$ and $\nu = 1/5$, and the Moore-Read state for $\nu = 5/2$.