Microwave spectroscopic studies of the bilayer electron solid states at low Landau filling in a wide quantum well

Abstract

At the low Landau filling factor $(\nu )$ termination of the fractional quantum Hall effect (FQHE) series, two-dimensional electron systems (2DESs) exhibit an insulating phase that is understood as a form of pinned Wigner solid. Here we use microwave spectroscopy to probe the transition to the insulator for a wide quantum well (WQW) sample that can support single-layer or bilayer states depending on its overall carrier density, $n$. We find the insulator exhibits a resonance, which is characteristic of a bilayer solid. The resonance also reveals a pair of transitions within the solid, which are not accessible to dc transport measurements. As $n$ is biased deeper into the bilayer solid regime, the resonance grows in specific intensity, and the transitions within the insulator disappear. These behaviors are suggestive of a picture of the insulating phase as an emulsion of liquid and solid components.

References in corpus (5)

• Melting of a 2D Quantum Electron Solid in High Magnetic Field
• Microwave Resonance of 2D Wigner Crystal around integer Landau fillings
• NMR profiling of quantum electron solids in high magnetic fields
• Evidence for Two Different Solid Phases of Two Dimensional Electrons in High Magnetic Fields
• Pinning modes and interlayer correlation in high magnetic field bilayer Wigner solids

Cited by in corpus (2)

• Upper bound on the window of density occupied by microemulsion phases in two-dimensional electron systems
• Interaction between Surface Acoustic Wave and Quantum Hall Effects