Probing quantum phases in ultra-high-mobility two-dimensional electron systems using surface acoustic waves

Abstract

Transport measurement, which applies an electric field and studies the migration of charged particles, i.e. the current, is the most widely used technique in condensed matter studies. It is generally assumed that the quantum phase remains unchanged when it hosts a sufficiently small probing current, which is, surprisingly, rarely examined experimentally. In this work, we study the ultra-high mobility two-dimensional electron system using a propagating surface acoustic wave, whose traveling speed is affected by the electrons' compressibility. The acoustic power used in our study is several orders of magnitude lower than previous reports, and its induced perturbation to the system is smaller than the transport current. Therefore we are able to observe the quantum phases become more incompressible when hosting a perturbative current.

10 pages, 10 figures

References in corpus (10)

• Non-Abelian Anyons and Topological Quantum Computation
• Observation of neutral modes in the fractional quantum Hall regime
• Finite Layer Thickness Stabilizes the Pfaffian State for the 5/2 Fractional Quantum Hall Effect: Wavefunction Overlap and Topological Degeneracy
• Fractional quantum Hall effect at $\nu =5/2$: Ground states, non-Abelian quasiholes, and edge modes in a microscopic model
• Microwave Resonance of 2D Wigner Crystal around integer Landau fillings
• Recent Experimental Progress of Fractional Quantum Hall Effect: 5/2 Filling State and Graphene
• Contrasting Behavior of the 5/2 and 7/3 Fractional Quantum Hall Effect in a Tilted Field
• Competing ν= 5/2 fractional quantum Hall states in confined geometry
• Spatial Mapping of Local Density Variations in Two-dimensional Electron Systems Using Scanning Photoluminescence
• Melting of Wigner crystal in high-mobility $n$-GaAs/AlGaAs heterostructures at filling factors $0.18>\nu >0.125$: Acoustic studies

Cited by in corpus (6)

• Gate-tunable quantum acoustoelectric transport in graphene
• Coherent detection of the oscillating acoustoelectric effect in graphene
• Interaction between Surface Acoustic Wave and Quantum Hall Effects
• Unexpected large electrostatic gating by pyroelectric charge accumulation
• A high-performance surface acoustic wave sensing technique
• Anomalous acousto-current within the quantum Hall plateaus