Journal Articles Physical Review Letters Year : 2023

Carrier-Density Control of the Quantum-Confined 1T-TiSe2 Charge Density Wave

Abstract

Using angle-resolved photoemission spectroscopy, combined with first principle and coupled selfconsistent Poisson-Schrödinger calculations, we demonstrate that potassium (K) atoms adsorbed on the low-temperature phase of 1T-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 Letter constitutes a prime example of a controlled exciton-related many-body quantum state in reduced dimensionality by alkali-metal dosing.

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hal-04113005 , version 1 (01-06-2023)

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Thomas Jaouen, Aki Pulkkinen, Maxime Rumo, Geoffroy Kremer, Björn Salzmann, et al.. Carrier-Density Control of the Quantum-Confined 1T-TiSe2 Charge Density Wave. Physical Review Letters, 2023, 130 (22), pp.226401. ⟨10.1103/physrevlett.130.226401⟩. ⟨hal-04113005⟩
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