Universal scaling of weak localization in graphene due to bias-induced dispersion decoherence.

ABSTRACT: The differential conductance of graphene is shown to exhibit a zero-bias anomaly at low temperatures, arising from a suppression of the quantum corrections due to weak localization and electron interactions. A simple rescaling of these data, free of any adjustable parameters, shows that this anomaly exhibits a universal, temperature- (T) independent form. According to this, the differential conductance is approximately constant at small voltages (V < k_BT/e), while at larger voltages it increases logarithmically with the applied bias. For theoretical insight into the origins of this behaviour, which is inconsistent with electron heating, we formulate a model for weak-localization in the presence of nonequilibrium transport. According to this model, the applied voltage causes unav

SUBMITTER: Somphonsane R 

PROVIDER: S-EPMC7101405 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature