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Fermi surface reconstruction in CeTe_2 induced by charge density waves investigated via angle resolved photoemission

机译:通过角分辨光发射研究电荷密度波在CeTe_2中的费米表面重构

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摘要

Electronic structures of a charge-density wave (CDW) system CeTe_(2-x)Sb_x (x = 0,0.05) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES) and the first-principles electronic and phonon band-structure methods. The observed Fermi surface (FS) agrees very well with the calculated FS for the undistorted CeTe_2 both in shapes and sizes. The metallic states crossing the Fermi level (E_F) are observed in ARPES even in the CDW state. The carriers near E_F have mainly the Te(1) 5p character, with a negligible contribution from Ce 4f states. The supercell (shadow) bands and the corresponding very weak FSs are found to arise from band folding due to the interaction of Te(1) layers with Ce-Te(2) layers. We found that the CDW modulation vector is along Γ-X (Q_(CDW)≈ X), which is not coincident with the most prominent FS nesting vector.
机译:电荷密度波(CDW)系统CeTe_(2-x)Sb_x(x = 0,0.05)的电子结构已通过使用角度分辨光发射光谱(ARPES)和第一性原理电子和声子能带结构进行了研究方法。观察到的费米表面(FS)在形状和大小上与未变形CeTe_2的计算FS非常吻合。即使在CDW状态下,在ARPES中也观察到超过费米能级(E_F)的金属态。 E_F附近的载流子主要具有Te(1)5p特征,而Ce 4f态的贡献可忽略不计。由于Te(1)层与Ce-Te(2)层之间的相互作用,发现超单元(阴影)带和相应的非常弱的FS是由带折叠引起的。我们发现CDW调制矢量沿着Γ-X(Q_(CDW)≈X),这与最突出的FS嵌套矢量不一致。

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