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Strong-coupling charge density wave in monolayer TiSe2

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Marković,  Igor
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0007-5E23-9
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