1. Carrier-Density Control of the Quantum-Confined 1$T$-TiSe$_2$ Charge-Density-Wave
- Author
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Jaouen, T., Pulkkinen, A., Rumo, M., Kremer, G., Salzmann, B., Nicholson, C. W., Mottas, M. -L., Giannini, E., Tricot, S., Schieffer, P., Hildebrand, B., Monney, C., Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Fribourg], Université de Fribourg = University of Fribourg (UNIFR), Fribourg Center for Nanomaterials (FriMat), University of West Bohemia [Plzeň ], Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Max Planck Society, Department of Quantum Matter Physics [Geneva] (DQMP), Université de Genève = University of Geneva (UNIGE), and This project was supported by the Fonds National Suisse pour la Recherche Scientifique through Div. II. Skillful technical assistance was provided by F. Bourqui, B. Hediger, and O. Raetzo.
- Subjects
Superconductivity (cond-mat.supr-con) ,[PHYS]Physics [physics] ,Condensed Matter - Materials Science ,Condensed Matter - Strongly Correlated Electrons ,Strongly Correlated Electrons (cond-mat.str-el) ,Condensed Matter - Superconductivity ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] - Abstract
Using angle-resolved photoemission spectroscopy, combined with first principle and coupled self-consistent Poisson-Schr\"odinger calculations, we demonstrate that potassium (K) atoms adsorbed on the low-temperature phase of 1$T$-TiSe$_2$ induce the creation of a two-dimensional electron gas (2DEG) and quantum confinement of its charge-density-wave (CDW) at the surface. By further changing the K coverage, we tune the carrier-density within the 2DEG that allows us to nullify, at the surface, the electronic energy gain due to exciton condensation in the CDW phase while preserving a long-range structural order. Our study constitutes a prime example of a controlled exciton-related many-body quantum state in reduced dimensionality by alkali-metal dosing., Comment: 6 pages, 3 figures, accepted for publication in Physical Review Letters
- Published
- 2023
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