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A full gap above the Fermi level: the charge density wave of monolayer VS(2)

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 c...

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Autores principales: van Efferen, Camiel, Berges, Jan, Hall, Joshua, van Loon, Erik, Kraus, Stefan, Schobert, Arne, Wekking, Tobias, Huttmann, Felix, Plaar, Eline, Rothenbach, Nico, Ollefs, Katharina, Arruda, Lucas Machado, Brookes, Nick, Schönhoff, Gunnar, Kummer, Kurt, Wende, Heiko, Wehling, Tim, Michely, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8617271/
https://www.ncbi.nlm.nih.gov/pubmed/34824213
http://dx.doi.org/10.1038/s41467-021-27094-x
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author van Efferen, Camiel
Berges, Jan
Hall, Joshua
van Loon, Erik
Kraus, Stefan
Schobert, Arne
Wekking, Tobias
Huttmann, Felix
Plaar, Eline
Rothenbach, Nico
Ollefs, Katharina
Arruda, Lucas Machado
Brookes, Nick
Schönhoff, Gunnar
Kummer, Kurt
Wende, Heiko
Wehling, Tim
Michely, Thomas
author_facet van Efferen, Camiel
Berges, Jan
Hall, Joshua
van Loon, Erik
Kraus, Stefan
Schobert, Arne
Wekking, Tobias
Huttmann, Felix
Plaar, Eline
Rothenbach, Nico
Ollefs, Katharina
Arruda, Lucas Machado
Brookes, Nick
Schönhoff, Gunnar
Kummer, Kurt
Wende, Heiko
Wehling, Tim
Michely, Thomas
author_sort van Efferen, Camiel
collection PubMed
description 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 VS(2) realizes a CDW which stands out of this standard model. There is a full CDW gap residing in the unoccupied states of monolayer VS(2). 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.
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spelling pubmed-86172712021-12-10 A full gap above the Fermi level: the charge density wave of monolayer VS(2) van Efferen, Camiel Berges, Jan Hall, Joshua van Loon, Erik Kraus, Stefan Schobert, Arne Wekking, Tobias Huttmann, Felix Plaar, Eline Rothenbach, Nico Ollefs, Katharina Arruda, Lucas Machado Brookes, Nick Schönhoff, Gunnar Kummer, Kurt Wende, Heiko Wehling, Tim Michely, Thomas Nat Commun Article 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 VS(2) realizes a CDW which stands out of this standard model. There is a full CDW gap residing in the unoccupied states of monolayer VS(2). 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. Nature Publishing Group UK 2021-11-25 /pmc/articles/PMC8617271/ /pubmed/34824213 http://dx.doi.org/10.1038/s41467-021-27094-x Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
van Efferen, Camiel
Berges, Jan
Hall, Joshua
van Loon, Erik
Kraus, Stefan
Schobert, Arne
Wekking, Tobias
Huttmann, Felix
Plaar, Eline
Rothenbach, Nico
Ollefs, Katharina
Arruda, Lucas Machado
Brookes, Nick
Schönhoff, Gunnar
Kummer, Kurt
Wende, Heiko
Wehling, Tim
Michely, Thomas
A full gap above the Fermi level: the charge density wave of monolayer VS(2)
title A full gap above the Fermi level: the charge density wave of monolayer VS(2)
title_full A full gap above the Fermi level: the charge density wave of monolayer VS(2)
title_fullStr A full gap above the Fermi level: the charge density wave of monolayer VS(2)
title_full_unstemmed A full gap above the Fermi level: the charge density wave of monolayer VS(2)
title_short A full gap above the Fermi level: the charge density wave of monolayer VS(2)
title_sort full gap above the fermi level: the charge density wave of monolayer vs(2)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8617271/
https://www.ncbi.nlm.nih.gov/pubmed/34824213
http://dx.doi.org/10.1038/s41467-021-27094-x
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