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Electronic structure of two-dimensional hexagonal diselenides: Charge density waves and pseudogap behavior1

机译:二维六方二硒化物的电子结构:电荷密度波和拟间隙行为1

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摘要

We theoretically study the electronic structure (spectral functions and Fermi surfaces) of incom- mensurate pseudogap and charge density wave (CDW) and commensurate CDW phases of quasi-two- dimensional diselenides 2H- TaSe _2 and 2H-NbSe _2. The incommensurate pseudogap regime is described within the scenario based on short-range-order CDW fluctuations, considered within the static Gaussian random field model. In contrast, e.g., to high-Tc cuprates, layered dichalcogenides have several different CDW scattering vectors and an electronic spectrum with two bands at the Fermi level. For this, we present a theoretical background for the description of multiple scattering processes within a multiple-band elec- tronic spectrum. Theoretical spectral functions and Fermi surfaces thus obtained are compared with recent ARPES experimental data, demonstrating rather good qualitative agreement.
机译:我们从理论上研究准二维二硒化物2H-TaSe _2和2H-NbSe _2的不等拟假隙和电荷密度波(CDW)以及相称CDW相的电子结构(光谱函数和费米表面)。在静态高斯随机场模型中考虑的基于短程CDW波动的场景中描述了不相称的伪间隙机制。相比之下,例如,对于高Tc的铜酸盐,层状二硫属化合物具有几种不同的CDW散射矢量和在费米能级具有两个谱带的电子光谱。为此,我们为描述多频带电子频谱内的多个散射过程提供了理论背景。由此获得的理论光谱函数和费米表面与最近的ARPES实验数据进行了比较,证明了很好的定性一致性。

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