Universität zu Köln

van Efferen, Camiel ORCID: 0000-0002-6237-8602, Berges, Jan ORCID: 0000-0001-7041-2906, Hall, Joshua, van Loon, Erik ORCID: 0000-0002-5436-290X, Kraus, Stefan, Schobert, Arne, Wekking, Tobias, Huttmann, Felix, Plaar, Eline, Rothenbach, Nico, Ollefs, Katharina, Arruda, Lucas Machado, Brookes, Nick, Schoenhoff, Gunnar, Kummer, Kurt, Wende, Heiko ORCID: 0000-0001-8395-3541, Wehling, Tim and Michely, Thomas (2021). A full gap above the Fermi level: the charge density wave of monolayer VS2. Nat. Commun., 12 (1). BERLIN: NATURE PORTFOLIO. ISSN 2041-1723

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Abstract

In the standard model of charge density wave (CDW) transitions, the displacement along a single phonon mode lowers the total electronic energy by creating a gap at the Fermi level, making the CDW a metal-insulator transition. Here, using scanning tunneling microscopy and spectroscopy and ab initio calculations, we show that VS2 realizes a CDW which stands out of this standard model. There is a full CDW gap residing in the unoccupied states of monolayer VS2. At the Fermi level, the CDW induces a topological metal-metal (Lifshitz) transition. Non-linear coupling of transverse and longitudinal phonons is essential for the formation of the CDW and the full gap above the Fermi level. Additionally, x-ray magnetic circular dichroism reveals the absence of net magnetization in this phase, pointing to coexisting charge and spin density waves in the ground state. A charge density wave (CDW) normally creates a gap at the Fermi level, inducing a metal-insulator transition. Here, the authors report that a CDW gap resides in the unoccupied states but induces a topological metal-metal transition at the Fermi level in monolayer VS2.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code van Efferen, Camiel UNSPECIFIED orcid.org/0000-0002-6237-8602 UNSPECIFIED Berges, Jan UNSPECIFIED orcid.org/0000-0001-7041-2906 UNSPECIFIED Hall, Joshua UNSPECIFIED UNSPECIFIED UNSPECIFIED van Loon, Erik UNSPECIFIED orcid.org/0000-0002-5436-290X UNSPECIFIED Kraus, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Schobert, Arne UNSPECIFIED UNSPECIFIED UNSPECIFIED Wekking, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Huttmann, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Plaar, Eline UNSPECIFIED UNSPECIFIED UNSPECIFIED Rothenbach, Nico UNSPECIFIED UNSPECIFIED UNSPECIFIED Ollefs, Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Arruda, Lucas Machado UNSPECIFIED UNSPECIFIED UNSPECIFIED Brookes, Nick UNSPECIFIED UNSPECIFIED UNSPECIFIED Schoenhoff, Gunnar UNSPECIFIED UNSPECIFIED UNSPECIFIED Kummer, Kurt UNSPECIFIED UNSPECIFIED UNSPECIFIED Wende, Heiko UNSPECIFIED orcid.org/0000-0001-8395-3541 UNSPECIFIED Wehling, Tim UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-592797
DOI:	10.1038/s41467-021-27094-x
Journal or Publication Title:	Nat. Commun.
Volume:	12
Number:	1
Date:	2021
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSITION; ANOMALIES; METAL Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59279