过渡金属二硫族化合物中激子电荷密度波与超导电性的相互作用
Interplay of Excitonic Charge Density Wave and Superconductivity in Transition Metal Dichalcogenides
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中文总结 AI 辅助
研究以1T-TiSe2为对象，在二维三角晶格构建含双轨道的最小模型，结合平均场分析揭示过渡金属二硫族化合物中激子CDW与SC的相互作用规律，其相图对能带细节不敏感，为相关研究提供关键见解。
中文摘要 AI 辅助
受1T-TiSe2相图独特特性的启发，我们在每个位点容纳两个轨道的二维三角晶格上，研究了激子电荷密度波（CDW）与超导电性（SC）的复杂相互作用。在插层、压力、替代和门控等多种调控参数的作用下，这些材料表现出CDW逐渐减弱，随后出现SC的普遍且渐进的行为。有趣的是，随着SC的出现，CDW的性质从公度转变为非公度。基于观测到的激子CDW和费米面中的电子与空穴口袋构建最小模型，并在简单平均场框架内对其进行分析，我们能够理解一些显著的实验特征。我们还发现，定性相图对能带结构的细节不敏感。这些结果为过渡金属二硫族化合物中CDW与SC相互作用的本质提供了关键见解。
英文摘要
Motivated by the unique characteristics of the phase diagram of 1T-TiSe2, we investigated the complex interplay of excitonic charge density wave (CDW) and superconductivity (SC) on a two-dimensional triangular lattice, each site accommodating two orbitals. In response to various tuning parameters, such as intercalation, pressure, substitution, and gating, these materials exhibit a generic and gradual waning of CDW, followed by the emergence of SC. Intriguingly, the nature of CDW changes from commensurate to incommensurate with the appearance of SC. Setting up a minimal model based on observed excitonic CDW and electron and hole pockets in the Fermi surface, and analyzing it within a simple mean-field framework, we can comprehend some salient experimental features. We also found that the qualitative phase diagram remains insensitive to details of the band structure. These results offer crucial insights into the nature of the interplay between CDW and SC in transition-metal dichalcogenides.
发表机构
- Indian Institute of Science Education and Research Kolkata（印度科学教育研究所加尔各答分校）
机构由 AI 辅助整理，请以论文原文为准。
