Universität zu Köln

Jolie, Wouter, Knispel, Timo, Ehlen, Niels ORCID: 0000-0002-8581-8359, Nikonov, Konstantin, Busse, Carsten ORCID: 0000-0001-5522-0578, Grueneis, Alexander and Michely, Thomas (2019). Charge density wave phase of VSe2 revisited. Phys. Rev. B, 99 (11). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Scanning tunneling microscopy and spectroscopy are used to image the charge density wave at the surface of cleaved VSe2 and to probe its local density of states at 5 K. The main features in the spectrum are linked to the contributions of the p-like and d-like bands of VSe2 found in angle-resolved photoemission spectroscopy and tight-binding calculations. Different from previous tunneling spectroscopy work, we find a narrow partial gap at the Fermi level that we associate with the charge density wave phase. The energy scale of the gap found in the experiment is in good agreement with the charge density wave transition temperature of VSe2, under the assumption of weak electron-phonon coupling, consistent with the Peierls model of Fermi surface nesting. The role of defects is investigated, which reveals that the partial gap in the density of states and hence the charge density wave itself is extremely stable, though the order, phase, and amplitude of the charge density waves on the surface are strongly perturbed by defects.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Knispel, Timo UNSPECIFIED UNSPECIFIED UNSPECIFIED Ehlen, Niels nehlen@outlook.de orcid.org/0000-0002-8581-8359 UNSPECIFIED Nikonov, Konstantin UNSPECIFIED UNSPECIFIED UNSPECIFIED Busse, Carsten UNSPECIFIED orcid.org/0000-0001-5522-0578 UNSPECIFIED Grueneis, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-153904
DOI:	10.1103/PhysRevB.99.115417
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 SCANNING-TUNNELING-MICROSCOPY; PERIODIC LATTICE DISTORTION; VANADIUM DISELENIDE; DICHALCOGENIDES; SPECTROSCOPY; DIFFRACTION; TRANSPORT; DEFECTS; GROWTH Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15390