Strong-coupling charge density wave in monolayer TiSe2

Matthew D Watson, Akhil Rajan, Tommaso Antonelli, Kaycee Underwood, Igor Marković, Federico Mazzola, Oliver Jon Clark, Gesa-Roxanne Siemann, Deepnarayanan Biswas, Andrew Hunter, Sven Jandura, Janika Reichstetter, Martin Mclaren, Patrick Le Fèvre, Giovanni Vinai, Philip D C King

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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.
Original languageEnglish
Article number015004
Number of pages10
Journal2D Materials
Issue number1
Publication statusPublished - 12 Oct 2020


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