Carrier-Density Control of the Quantum-Confined1T−TiSe2Charge Density Wave,Physical Review Letters

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Carrier-Density Control of the Quantum-Confined1T−TiSe2Charge Density Wave
Physical Review Letters ( IF 8.1 ) Pub Date : 2023-05-31 , DOI: 10.1103/physrevlett.130.226401
T Jaouen ₁ , A Pulkkinen _{2,

3} , M Rumo _{2,

4} , G Kremer _{2,

5} , B Salzmann ₂ , C W Nicholson _{2,

6} , M-L Mottas ₂ , E Giannini ₇ , S Tricot ₁ , P Schieffer ₁ , B Hildebrand ₂ , C Monney ₂

Affiliation

Using angle-resolved photoemission spectroscopy, combined with first principle and coupled self-consistent Poisson-Schrödinger 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 Letter constitutes a prime example of a controlled exciton-related many-body quantum state in reduced dimensionality by alkali-metal dosing.

中文翻译：

量子限制 1T−TiSe2 电荷密度波的载流子密度控制

使用角分辨光电子能谱，结合第一性原理和耦合自洽泊松-薛定谔计算，我们证明钾 (K) 原子吸附在低温相上

1个 吨 − {硒化钛}_{2个}

诱导二维电子气 (2DEG) 的产生及其电荷密度波 (CDW) 在表面的量子限制。通过进一步改变 K 覆盖率，我们调整 2DEG 内的载流子密度，使我们能够在表面抵消由于 CDW 相中的激子凝聚而产生的电子能量增益，同时保持长程结构有序。我们的信构成了通过碱金属剂量降低维数的受控激子相关多体量子态的主要示例。

更新日期：2023-06-01

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