论文标题
电荷密度波订单和电子波耦合三元超导体BI $ _2 $ rh $ _3 $ se $ _2 $
Charge Density Wave order and electron-phonon coupling in ternary superconductor Bi$_2$Rh$_3$Se$_2$
论文作者
论文摘要
新发现的三元粉红色超导体BI $ _2 $ rh $ _3 $ _3 $ se $ _2 $吸引了越来越多的关注，这为探索电荷密度波（CDW）顺序和超导率之间的相互作用提供了机会。但是，是否可以将240 K处的相变归因于CDW的形成仍然存在争议。为了帮助解决辩论，我们通过角度分辨光光谱实验研究了BI2RH3SE2的电子结构研究，重点是其在240 K时其高温相变的性质。我们的测量表明，在240 K处的相变是第二阶CDW相变。我们的结果表明（i）（i）BI $ _2 $ rh $ _3 $ _3 $ se $ _2 $的2 x 2 cdw订单，伴随着电子结构的重建，例如频段折叠，频段分开和在远离费米级别的CDW差距的打开； （ii）存在电子偶联的存在，该耦合表现为分散体中明显的扭结和峰值浸入结构； （iii）扁平带的外观。因此，我们的观察结果使我们能够阐明CDW订单的性质及其与Bi $ _2 $ RH $ _3 $ _3 $ SE $ _2 $的超导性相互作用。
The newly discovered ternary chalcogenide superconductor Bi$_2$Rh$_3$Se$_2$ has attracted growing attention, which provides an opportunity to explore the interplay between charge density wave (CDW) order and superconductivity. However, whether the phase transition at 240 K can be attributed to CDW formation remains controversial. To help resolve the debate, we study the electronic structure study of Bi2Rh3Se2 by angle-resolved photoemission spectroscopy experiments, with emphasis on the nature of its high-temperature phase transition at 240 K. Our measurements demonstrate that the phase transition at 240 K is a second-order CDW phase transition. Our results reveal (i) a 2 x 2 CDW order in Bi$_2$Rh$_3$Se$_2$, accompanied by the reconstruction of electronic structure, such as band folding, band splitting, and opening of CDW gaps at and away from Fermi level; (ii) the existence of electron-phonon coupling, which is manifested as an obvious kink and peak-dip-hump structure in dispersion; and (iii) the appearance of a flat band. Our observations thus enable us to shed light on the nature of the CDW order and its interplay with superconductivity in Bi$_2$Rh$_3$Se$_2$.
