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:
CreatorsEmailORCIDORCID Put Code
van Efferen, CamielUNSPECIFIEDorcid.org/0000-0002-6237-8602UNSPECIFIED
Berges, JanUNSPECIFIEDorcid.org/0000-0001-7041-2906UNSPECIFIED
Hall, JoshuaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Loon, ErikUNSPECIFIEDorcid.org/0000-0002-5436-290XUNSPECIFIED
Kraus, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schobert, ArneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wekking, TobiasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huttmann, FelixUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plaar, ElineUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rothenbach, NicoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ollefs, KatharinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Arruda, Lucas MachadoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brookes, NickUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schoenhoff, GunnarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kummer, KurtUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wende, HeikoUNSPECIFIEDorcid.org/0000-0001-8395-3541UNSPECIFIED
Wehling, TimUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Michely, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
TRANSITION; ANOMALIES; METALMultiple languages
Multidisciplinary SciencesMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/59279

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