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

被引：5

作者：

Jaouen, T. ^{[1
]}

Pulkkinen, A. ^{[2
,3
]}

Rumo, M. ^{[2
,4
]}

Kremer, G. ^{[2
,5
]}

Salzmann, B. ^{[2
]}

Nicholson, C. W. ^{[2
,6
]}

Mottas, M. -L. ^{[2
]}

Giannini, E. ^{[7
]}

Tricot, S. ^{[1
]}

Hildebrand, B. ^{[2
]}

Monney, C. ^{[2
]}

Schieffer, P. ^{[1
]}

机构：

[1] Univ Rennes, CNRS, IPR Inst Phys Rennes, UMR 6251, F-35000 Rennes, France

[2] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

[3] Univ West Bohemia, New Technol Res Ctr, CZ-30100 Plzen, Czech Republic

[4] Haute Ecole Ingn & Architecture Fribourg, CH-1700 Fribourg, Switzerland

[5] Univ Lorraine, CNRS, Inst Jean Lamour, Campus ARTEM,UMR 7198, 2 Allee Andre Guinier,BP 50840, F-54011 Nancy, France

[6] Fritz Haber Inst Max Planck Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany

[7] Univ Geneva, Dept Quantum Matter Phys, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 130卷 / 22期

关键词：

TOTAL-ENERGY CALCULATIONS; SUPERCONDUCTIVITY; APPROXIMATION; DYNAMICS;

D O I：

10.1103/PhysRevLett.130.226401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using angle-resolved photoemission spectroscopy, combined with first principle and coupled self -consistent Poisson-Schrodinger calculations, we demonstrate that potassium (K) atoms adsorbed on the low-temperature phase of 1T-TiSe2 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.

引用

页数：6

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