Universität zu Köln

Dombrowski, Daniela, Jolie, Wouter, Petrovic, Marin ORCID: 0000-0002-2234-1207, Runte, Sven, Craes, Fabian, Klinkhammer, Juergen, Kralj, Marko ORCID: 0000-0002-9786-3130, Lazic, Predrag, Sela, Eran and Busse, Carsten ORCID: 0000-0001-5522-0578 (2017). Energy-Dependent Chirality Effects in Quasifree-Standing Graphene. Phys. Rev. Lett., 118 (11). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dombrowski, Daniela UNSPECIFIED UNSPECIFIED UNSPECIFIED Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Petrovic, Marin UNSPECIFIED orcid.org/0000-0002-2234-1207 UNSPECIFIED Runte, Sven UNSPECIFIED UNSPECIFIED UNSPECIFIED Craes, Fabian UNSPECIFIED UNSPECIFIED UNSPECIFIED Klinkhammer, Juergen UNSPECIFIED UNSPECIFIED UNSPECIFIED Kralj, Marko UNSPECIFIED orcid.org/0000-0002-9786-3130 UNSPECIFIED Lazic, Predrag UNSPECIFIED UNSPECIFIED UNSPECIFIED Sela, Eran UNSPECIFIED UNSPECIFIED UNSPECIFIED Busse, Carsten UNSPECIFIED orcid.org/0000-0001-5522-0578 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-236659
DOI:	10.1103/PhysRevLett.118.116401
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	118
Number:	11
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EPITAXIAL GRAPHENE; BERRYS PHASE; INTERCALATION; SCATTERING; STATES Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23665