Journal
2D MATERIALS
Volume 8, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2053-1583/abafec
Keywords
ARPES; CDW; monolayer; TiSe2; MBE; transition metal dichalcogenides
Categories
Funding
- Royal Society
- Leverhulme Trust
- European Research Council [ERC-714193-QUESTDO]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/M023958/1]
- EPSRC [EP/L015110/1, EP/K503162/1]
- IM the International Max Planck Research School for Chemistry and Physics of Quantum Materials
- project CALIPSOplus under the EU Framework Programme for Research and Innovation HORIZON 2020 [730872]
- EPSRC [EP/M023958/1] Funding Source: UKRI
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The study of 2 x 2 charge density wave in epitaxially-grown monolayer TiSe2 reveals a strong coupling instability and the existence of an electron pocket as a non-bonding state at low temperatures. It is shown that the CDW order can be suppressed with modest doping of around 0.06(2) electrons per Ti. The results provide a comprehensive understanding of the CDW phenomenology in TiSe2 in the 2D limit, emphasizing the crucial role of structural aspects in the phase transition for hybridization in the ground state.
We study the 2 x 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 TiSe(2)in the 2D limit.
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