Transport signatures of pseudo-magnetic Landau levels in strained graphene ribbons

TL;DR

This paper investigates how inhomogeneous strain in graphene ribbons creates pseudo-magnetic fields, leading to localized Landau levels that produce distinct conductance signatures observable in transport experiments.

Contribution

It demonstrates the transport signatures of pseudo-magnetic Landau levels in strained graphene, linking theoretical predictions to experimental conductance resonances.

Findings

Observation of low-energy conductance resonances as signatures of pseudo-magnetic Landau levels

Strain inhomogeneity near ribbon ends causes localized states detectable via transport measurements

Pseudo-magnetic fields induce valley-antisymmetric Landau levels in strained graphene

Abstract

In inhomogeneously strained graphene, low-energy electrons experience a valley-antisymmetric pseudo-magnetic field which leads to the formation of localized states at the edge between the valence and conduction bands, understood in terms of peculiar n=0 pseudo-magnetic Landau levels. Here we show that such states can manifest themselves as an isolated quadruplet of low-energy conductance resonances in a suspended stretched graphene ribbon, where clamping by the metallic contacts results in a strong inhomogeneity of strain near the ribbon ends.