Phonon assisted dynamical Coulomb blockade in a thin suspended graphite sheet

TL;DR

This paper investigates how phonon interactions influence dynamical Coulomb blockade effects in suspended graphene, revealing sharp conductance dips due to energy exchange with a resonant phonon mode.

Contribution

It introduces a model explaining conductance dips in suspended graphene via phonon-assisted dynamical Coulomb blockade effects.

Findings

Observation of quasi-periodic conductance dips at low temperature

Identification of a resonant phonon mode coupled to electrons

Explanation of conductance features through a dynamical Coulomb blockade model

Abstract

The differential conductance in a suspended few layered graphene sample is fou nd to exhibit a series of quasi-periodic sharp dips as a function of bias at l ow temperature. We show that they can be understood within a simple model of dyn amical Coulomb blockade where energy exchanges take place between the charge carriers transmitted trough the sample and a dissipative electromagnetic envir onment with a resonant phonon mode strongly coupled to the electrons.