论文标题
分层半导体EUTE中电荷密度波顺序的角度分辨光发射光谱研究4
Angle-resolved photoemission spectroscopy study of the charge density wave order in layered semiconductor EuTe4
论文作者
论文摘要
分层的牙腔已被广泛研究为研究费米表面（FS）嵌套驱动的电荷密度波（CDW）状态的平台。 Eute4是准二维（准2D）二进制稀释四甲尿素CDW化合物之一，具有非常规的滞后过渡，目前正在引起广泛关注。在这里，使用角度分辨光发射光谱研究了EUTE4中CDW差距的CDW调制载体，动量和温度依赖性。 Our results reveal that (i) a FS nesting vector q ~ 0.67 b* drives the formation of CDW state, (ii) a large anisotropic CDW gap is fully open in the whole FS, and maintains a considerable size even at 300 K, leading to appearance of semiconductor properties, (iii) an abnormal non-monotonic increase of CDW gap in magnitude as a function of temperature, (iv) an extra, larger由于主带的不同轨道之间的相互作用，GAP在更高的结合能中打开。
Layered tellurides have been extensively studied as a platform for investigating the Fermi surface (FS) nesting-driven charge density wave (CDW) states. EuTe4, one of quasi-two-dimensional (quasi-2D) binary rare-earth tetratellurides CDW compounds, with unconventional hysteretic transition, is currently receiving much attention. Here, the CDW modulation vector, momentum and temperature dependence of CDW gaps in EuTe4 are investigated using angle-resolved photoemission spectroscopy. Our results reveal that (i) a FS nesting vector q ~ 0.67 b* drives the formation of CDW state, (ii) a large anisotropic CDW gap is fully open in the whole FS, and maintains a considerable size even at 300 K, leading to appearance of semiconductor properties, (iii) an abnormal non-monotonic increase of CDW gap in magnitude as a function of temperature, (iv) an extra, larger gap opens at a higher binding energy due to the interaction between the different orbits of the main bands.
