Energy-Dependent Chirality Effects in Quasifree-Standing Graphene

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 t...

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Bibliographic Details
Published in:Physical review letters Vol. 118; no. 11; p. 116401
Main Authors: Dombrowski, Daniela, Jolie, Wouter, Petrović, Marin, Runte, Sven, Craes, Fabian, Klinkhammer, Jürgen, Kralj, Marko, Lazić, Predrag, Sela, Eran, Busse, Carsten
Format: Journal Article
Language:English
Published: United States 17.03.2017
Subjects:
Channels
Chirality
Electron scattering
Graphene
Mathematical analysis
Shape
Simulation
Singularities
ISSN:0031-9007, 1079-7114, 1079-7114
Online Access:Get full text
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Summary: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.
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ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.118.116401