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  Strong-coupling charge density wave in monolayer TiSe2

Watson, M. D., Rajan, A., Antonelli, T., Underwood, K., Marković, I., Mazzola, F., et al. (2020). Strong-coupling charge density wave in monolayer TiSe2. 2D Materials, 8(1): 015004, pp. 1-10. doi:10.1088/2053-1583/abafec.

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 Creators:
Watson, Matthew D.1, Author
Rajan, Akhil1, Author
Antonelli, Tommaso1, Author
Underwood, Kaycee1, Author
Marković, Igor2, Author              
Mazzola, Federico1, Author
Clark, Oliver J.1, Author
Siemann, Gesa-Roxanne1, Author
Biswas, Deepnarayan1, Author
Hunter, Andrew1, Author
Jandura, Sven1, Author
Reichstetter, Janika1, Author
McLaren, Martin1, Author
Le Fèvre, Patrick1, Author
Vinai, Giovanni1, Author
King, Philip D. C.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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Free keywords: Charge density; Ground state; Monolayers; Photoelectron spectroscopy; Selenium compounds; Temperature; Titanium compounds, Angle resolved photoemission spectroscopy; Epitaxially grown; Low temperatures; Quantitative comparison; Structural aspects; Symmetry-breaking; Temperature dependent; Tight binding model, Charge density waves
 Abstract: We study the 2 × 2 charge density wave (CDW) in epitaxially-grown monolayer TiSe2. Our temperature-dependent angle-resolved photoemission spectroscopy measurements indicate a strong-coupling instability, but reveal how not all states couple equally to the symmetry-breaking distortion, with an electron pocket persisting to low temperature as a non-bonding state. We further show how the CDW order can be suppressed by a modest doping of around 0.06(2) electrons per Ti. Our results provide an opportunity for quantitative comparison with a realistic tight-binding model, which emphasises a crucial role of structural aspects of the phase transition in understanding the hybridisation in the ground state. Together, our work provides a comprehensive understanding of the phenomenology of the CDW in TiSe2 in the 2D limit. © 2020 IOP Publishing Ltd

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Language(s): eng - English
 Dates: 2020-10-122020-10-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1088/2053-1583/abafec
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Title: 2D Materials
Source Genre: Journal
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Publ. Info: Bristol : IOP Publ.
Pages: - Volume / Issue: 8 (1) Sequence Number: 015004 Start / End Page: 1 - 10 Identifier: ISSN: 2053-1583
CoNE: https://pure.mpg.de/cone/journals/resource/2053-1583