AC Magnetotransport in Reentrant Insulating Phases of Two-dimensional Electrons near 1/5 and 1/3 Landau fillings

TL;DR

This study investigates high-frequency magnetotransport in two-dimensional electron systems near reentrant insulating phases, revealing resonant behavior and supporting the electron solid interpretation, with new insights into the interplay between fractional quantum Hall states and insulating phases.

Contribution

It provides the first high-frequency measurements of magnetotransport in reentrant insulating phases near specific Landau fillings, highlighting resonant behavior and complex interactions.

Findings

Resonant peak in magnetoconductivity at ~150 MHz near $ u$=0.21

Evidence supporting the electron solid as the origin of the RIP

Revealed features indicating interplay between 1/3 FQHE and RIP

Abstract

We have measured high frequency magnetotransport of a high quality two-dimensional electron system (2DES) near the reentrant insulating phase (RIP) at Landau fillings ($\nu$) between 1/5 and 2/9. The magneto\textit{conductivity} in the RIP has resonant behavior around 150 MHz, showing a \textit{peak} at $\nu$$\sim$0.21. Our data support the interpretation of the RIP as due to some pinned electron solid. We have also investigated a narrowly confined 2DES recently found to have a RIP at 1/3$<$$\nu$$<$1/2 and we have revealed features, not seen in DC transport, that suggest some intriguing interplay between the 1/3 FQHE and RIP.