Surface acoustic wave propagation in monolayer graphene

TL;DR

This paper explores how surface acoustic waves interact with monolayer graphene's unique electronic properties, revealing new insights into conductivity behavior and Landau oscillations through SAW measurements.

Contribution

It demonstrates how SAW observables are affected by graphene's Dirac electrons and predicts a crossover from Schrödinger to Dirac behavior with gate voltage.

Findings

Landau oscillations observable as a function of gate voltage

SAW provides wave vector dependence of graphene conductivity

Crossover from Schrödinger to Dirac behavior predicted

Abstract

Surface acoustic wave (SAW) propagation is a powerful method to investigate 2D electron systems. We show how SAW observables are influenced by coupling to the 2D massless Dirac electrons of graphene and argue that Landau oscillations can be observed as function of gate voltage for constant field. Contrary to other transport measurements, the zero-field SAW propagation gives the wave vector dependence of graphene conductivity for small wave numbers. We predict a crossover from Schroedinger to Dirac like behaviour as a function of gate voltage, with no attenuation in the latter for clean samples.