Charge transport and shot noise in ballistic graphene sheet

TL;DR

This paper investigates charge transport and shot noise in ballistic graphene sheets, comparing coherent and incoherent regimes, revealing non-monotonous conductance and noise characteristics at low voltages.

Contribution

It provides a detailed analysis of shot noise and conductance in ballistic graphene, highlighting differences between coherent and incoherent transport regimes.

Findings

At high voltages, differences between coherent and incoherent transport diminish.

Incoherent transport shows non-monotonous conductance and Fano factor at low voltages.

Conductance has a minimum and Fano factor has a maximum at non-zero bias in incoherent regime.

Abstract

The current and the shot noise in a graphene sheet were analyzed in the ballistic regime for arbitrary voltage drops between leads and the sheet in the limit of infinite aspect ratio of the sheet width to its length, when quantization of transversal wave vectors is not essential. The cases of coherent and incoherent ballistic transport were compared. At high voltages the difference with coherent transport is not essential. But at low voltages conductance and Fano-factor dependences for incoherent transport become non-monotonous so that the conductance has a minimum and the Fano factor has a maximum at non-zero voltage bias.