Universität zu Köln

Jolie, Wouter, Lux, Jonathan, Poertner, Mathias, Dombrowski, Daniela, Herbig, Charlotte, Knispel, Timo, Simon, Sabina, Michely, Thomas, Rosch, Achim ORCID: 0000-0002-6586-5721 and Busse, Carsten ORCID: 0000-0001-5522-0578 (2018). Suppression of Quasiparticle Scattering Signals in Bilayer Graphene Due to Layer Polarization and Destructive Interference. Phys. Rev. Lett., 120 (10). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

We study chemically gated bilayer graphene using scanning tunneling microscopy and spectroscopy complemented by tight-binding calculations. Gating is achieved by intercalating Cs between bilayer graphene and Ir(111), thereby shifting the conduction band minima below the chemical potential. Scattering between electronic states (both intraband and interband) is detected via quasiparticle interference. However, not all expected processes are visible in our experiment. We uncover two general effects causing this suppression: first, intercalation leads to an asymmetrical distribution of the states within the two layers, which significantly reduces the scanning tunneling spectroscopy signal of standing waves mainly present in the lower layer; second, forward scattering processes, connecting points on the constant energy contours with parallel velocities, do not produce pronounced standing waves due to destructive interference. We present a theory to describe the interference signal for a general n-band material.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Lux, Jonathan UNSPECIFIED UNSPECIFIED UNSPECIFIED Poertner, Mathias UNSPECIFIED UNSPECIFIED UNSPECIFIED Dombrowski, Daniela UNSPECIFIED UNSPECIFIED UNSPECIFIED Herbig, Charlotte UNSPECIFIED UNSPECIFIED UNSPECIFIED Knispel, Timo UNSPECIFIED UNSPECIFIED UNSPECIFIED Simon, Sabina UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED Busse, Carsten UNSPECIFIED orcid.org/0000-0001-5522-0578 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-192933
DOI:	10.1103/PhysRevLett.120.106801
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	120
Number:	10
Date:	2018
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EPITAXIAL GRAPHENE Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19293