Wigner solid pinning modes tuned by fractional quantum Hall states of a nearby layer

Abstract

We study a bilayer system hosting exotic many-body states of two-dimensional electron systems (2DESs) in close proximity but isolated from one another by a thin barrier. One 2DES has low electron density and forms a Wigner solid (WS) at high magnetic fields. The other has much higher density and, in the same field exhibits fractional quantum Hall states (FQHSs). The WS manifests microwave resonances which are understood as pinning modes, collective oscillations of the WS within the small but finite ubiquitous disorder. Our measurements reveal a striking evolution of the pinning mode frequencies of the WS layer with the formation of the FQHSs in the nearby layer, evincing a strong coupling between the WS pinning modes and the state of the 2DES in the adjacent layer, mediated by screening.

References in corpus (12)

• Correlation lengths of Wigner crystal order in two dimensional electron system at high magnetic field
• Wigner Crystals in the lowest Landau level at low filling factors
• Pinned Wigner Crystals
• Sharp Tunneling Resonance from the Vibrations of an Electronic Wigner Crystal
• Dynamical response of a weakly pinned two-dimensional Wigner crystal
• Dynamical response of a pinned two-dimensional Wigner crystal
• NMR profiling of quantum electron solids in high magnetic fields
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• Evidence for Two Different Solid Phases of Two Dimensional Electrons in High Magnetic Fields
• Interaction-induced Interlayer Charge Transfer in the Extreme Quantum Limit
• Unequal Layer Densities in Bilayer Wigner Crystal at High Magnetic Field
• Analytical Theory of Strongly Correlated Wigner Crystals in the Lowest Landau Level

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• Melting, Reentrant Ordering and Peak Effect for Wigner Crystals with Quenched and Thermal Disorder
• Thermal Activation Signatures of the Anderson Insulator and the Wigner Solid forming near $\nu =1$