Quantum Transport in Graphene Using Surface Acoustic Wave Resonators

Abstract

Surface acoustic waves (SAWs) provide a contactless method for measuring the wavevector-dependent conductivity. This technique has been used to discover emergent length scales in the fractional quantum Hall regime of traditional, semiconductor-based heterostructures. SAWs would appear to be an ideal match for van der Waals (vdW) heterostructures, but the right combination of substrate and experimental geometry to allow access to the quantum transport regime has not yet been found. We demonstrate that SAW resonant cavities fabricated on LiNbO${}_3$ substrates can be used to access the quantum Hall regime of high-mobility, hexagonal boron nitride (hBN) encapsulated graphene heterostructures. Our work establishes SAW resonant cavities as a viable platform for performing contactless conductivity measurements in the quantum transport regime of vdW materials.

arXiv comment2 figures

References in corpus (11)

• Ultrahigh electron mobility in suspended graphene
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Dirac cones reshaped by interaction effects in suspended graphene
• Abundance of correlated insulating states at fractional fillings of WSe${}_2$/WS${}_2$ moiré superlattices
• Spin and valley quantum Hall ferromagnetism in graphene
• Even denominator fractional quantum Hall states in higher Landau levels of graphene
• Surface acoustic wave propagation in monolayer graphene
• Negative resistance state in superconducting NbSe${}_2$ induced by surface acoustic waves
• Quantum oscillations in 2D insulators induced by graphite gates
• Flip-chip gate-tunable acoustoelectric effect in graphene
• Fractal non-Fermi liquids from moiré-Hofstadter phonons

Cited by in corpus (7)

• Acousto-drag photovoltaic effect by piezoelectric integration of two-dimensional semiconductors
• Gate-tunable quantum acoustoelectric transport in graphene
• Coherent detection of the oscillating acoustoelectric effect in graphene
• Unexpected large electrostatic gating by pyroelectric charge accumulation
• Observation of Shapiro Steps in the Charge Density Wave State Induced by Strain on a Piezoelectric Substrate
• Anomalous acousto-current within the quantum Hall plateaus
• Generation of a single-cycle surface acoustic wave pulse on LiNbO${}_3$ for application to thin film materials