Flip-chip gate-tunable acoustoelectric effect in graphene

Abstract

We demonstrate a flip-chip device for performing low-temperature acoustoelectric measurements on exfoliated two-dimensional materials. With this device, we study gate-tunable acoustoelectric transport in an exfoliated monolayer graphene device, measuring the voltage created as high-frequency surface acoustic waves dynamically drive the graphene charge carriers, the density of which we simultaneously control with a silicon back-gate. We demonstrate ambipolar dependence of the acoustoelectric signal, as expected from the sign of the graphene charge carriers. We observe a marked reduction in the magnitude of the acoustoelectric signal over a well-defined range of density in the vicinity of charge neutrality, which we attribute to a spatially heterogeneous charge-disorder landscape not directly revealed by conventional transport measurements.

arXiv comment7 pages, 5 figures

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Cited by in corpus (8)

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• Quantum Transport in Graphene Using Surface Acoustic Wave Resonators
• Piezoacoustics for precision control of electrons floating on helium
• The Acoustophotoelectric Effect: Efficient Phonon-Photon-Electron Coupling in Zero-Voltage-Biased 2D SnS${}_2$ for Broadband Photodetection
• Acoustoelectric current in graphene due to electron deformation potential and piezoelectric phonon couplings
• Anomalous attenuation of piezoacoustic surface waves by liquid helium thin films
• Frequency-modulated enhancement of microwave resonator sensing
• Imaging GHz surface acoustic wave modes in electrostricted LaAlO${}_3$/SrTiO${}_3$ heterostructures