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Orbital-selective band hybridisation at the charge density wave transition in monolayer TiTe2

Antonelli, Tommaso; Rahim, Warda; Watson, Matthew D; Rajan, Akhil; Clark, Oliver J; Danilenko, Alisa; Underwood, Kaycee; ... King, Phil DC; + view all (2022) Orbital-selective band hybridisation at the charge density wave transition in monolayer TiTe2. npj Quantum Materials , 7 , Article 98. 10.1038/s41535-022-00508-9. Green open access

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Abstract

Reducing the thickness of a material to its two-dimensional (2D) limit can have dramatic consequences for its collective electronic states, including magnetism, superconductivity, and charge and spin ordering. An extreme case is TiTe2, where a charge density wave (CDW) emerges in the single-layer, which is absent for the bulk compound, and whose origin is still poorly understood. Here, we investigate the electronic band structure evolution across this CDW transition using temperature-dependent angle-resolved photoemission spectroscopy. Our study reveals an orbital-selective band hybridisation between the backfolded conduction and valence bands occurring at the CDW phase transition, which in turn leads to a significant electronic energy gain, underpinning the CDW transition. For the bulk compound, we show how this energy gain is almost completely suppressed due to the three-dimensionality of the electronic band structure, including via a kz-dependent band inversion which switches the orbital character of the valence states. Our study thus sheds new light on how control of the electronic dimensionality can be used to trigger the emergence of new collective states in 2D materials.

Type: Article
Title: Orbital-selective band hybridisation at the charge density wave transition in monolayer TiTe2
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41535-022-00508-9
Publisher version: https://doi.org/10.1038/s41535-022-00508-9
Language: English
Additional information: © The Author(s) 2022. 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/.
Keywords: cond-mat.str-el, cond-mat.str-el
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10156876
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