Energy-Dependent Chirality Effects in Quasifree-Standing Graphene

Daniela Dombrowski, Wouter Jolie, Marin Petrović, Sven Runte, Fabian Craes, Jürgen Klinkhammer, Marko Kralj, Predrag Lazić, Eran Sela, Carsten Busse

Research output: Contribution to journalArticlepeer-review

Abstract

We present direct experimental evidence of broken chirality in graphene by analyzing electron scattering processes at energies ranging from the linear (Dirac-like) to the strongly trigonally warped region. Furthermore, we are able to measure the energy of the van Hove singularity at the M point of the conduction band. Our data show a very good agreement with theoretical calculations for free-standing graphene. We identify a new intravalley scattering channel activated in case of a strongly trigonally warped constant energy contour, which is not suppressed by chirality. Finally, we compare our experimental findings with T-matrix simulations with and without the presence of a pseudomagnetic field and suggest that higher order electron hopping effects are a key factor in breaking the chirality near to the van Hove singularity.

Original languageEnglish
Article number116401
JournalPhysical Review Letters
Volume118
Issue number11
DOIs
StatePublished - 13 Mar 2017

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