Universität zu Köln

Murray, Clifford, Jolie, Wouter, Fischer, Jeison A., Hall, Joshua, van Efferen, Camiel, Ehlen, Niels ORCID: 0000-0002-8581-8359, Grueneis, Alexander, Busse, Carsten and Michely, Thomas (2019). Comprehensive tunneling spectroscopy of quasifreestanding MoS2 on graphene on Ir(111). Phys. Rev. B, 99 (11). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We apply scanning tunneling spectroscopy to determine the band gaps of mono-, bi-, and trilayer MoS2 grown on a graphene single crystal on Ir(111). Besides the typical scanning tunneling spectroscopy at constant height, we employ two additional spectroscopic methods giving extra sensitivity and qualitative insight into the k vector of the tunneling electrons. Employing this comprehensive set of spectroscopic methods in tandem, we deduce a band gap of 2.53 +/- 0.08 eV for the monolayer. This is close to the predicted values for freestanding MoS2 and larger than is measured for MoS2 on other substrates. Through precise analysis of the comprehensive tunneling spectroscopy we also identify critical point energies in the mono- and bilayer MoS2 band structures. These compare well with their calculated freestanding equivalents, evidencing the graphene/Ir(111) substrate as an excellent environment upon which to study the many celebrated electronic phenomena of monolayer MoS2 and similar materials. Additionally, this investigation serves to expand the fledgling field of the comprehensive tunneling spectroscopy technique itself.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Murray, Clifford UNSPECIFIED UNSPECIFIED UNSPECIFIED Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Jeison A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hall, Joshua UNSPECIFIED UNSPECIFIED UNSPECIFIED van Efferen, Camiel UNSPECIFIED UNSPECIFIED UNSPECIFIED Ehlen, Niels nehlen@outlook.de orcid.org/0000-0002-8581-8359 UNSPECIFIED Grueneis, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Busse, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-153373
DOI:	10.1103/PhysRevB.99.115434
Journal or Publication Title:	Phys. Rev. B
Volume:	99
Number:	11
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SINGLE-LAYER MOS2; ELECTRONIC-STRUCTURE; GROWTH; STATES; GAP Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15337