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arXiv 2203.00675cond-mat.mtrl-scicond-mat.str-el
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插层过渡金属二硫属化合物面外电子色散的可视化研究

Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide

Xian P. Yang, Harrison LaBollita, Zi-Jia Cheng, Hari Bhandari, Tyler A. Cochran, Jia-Xin Yin, Md. Shafayat Hossain, Ilya Belopolski, Qi Zhang, Yuxiao Jiang, Nan… 展开作者

Xian P. Yang, Harrison LaBollita, Zi-Jia Cheng, Hari Bhandari, Tyler A. Cochran, Jia-Xin Yin, Md. Shafayat Hossain, Ilya Belopolski, Qi Zhang, Yuxiao Jiang, Nana Shumiya, Daniel Multer, Maksim Liskevich, Dmitry A. Usanov, Yanliu Dang, Vladimir N. Strocov, Albert V. Davydov, Nirmal J. Ghimire, Antia S. Botana, M. Zahid Hasan

摘要:

层状过渡金属二硫属化合物具有丰富的相图,许多物理性质具有二维性。Co 1/3 NbS 2是该家族的最新成员之一,其中Co原子插入NbS 2层之间的范德华能隙中。利用表面和体敏角分辨光电子能谱研究了Co 1/3 NbS 2的三维电子能带结构。我们表明,Co插层后的电子带不符合刚性带位移图像。相反,Co 1/3 NbS 2在费米能级附近显示出与原始NbS 2化合物不同的轨道特性,并且尽管其具有层状结构,但在kz方向上具有清晰的能带色散。我们的光电子能谱研究证实了Co嵌入引入的面外电子关联,从而为该化合物的研究提供了一个新的视角。最后,我们提出如何费米能级调谐可能导致奇异相,如自旋密度波不稳定性。

英文摘要:

Layered transition metal dichalcogenides have rich phase diagram and they feature two dimensionality on numerous physical properties. Co1/3NbS2 is one of the newest members of this family where Co atoms are intercalated into the Van der Waals gaps between NbS2 layers. We study the three-dimensional electronic band structure of Co1/3NbS2 using both surface and bulk sensitive angle-resolved photoemission spectroscopy. We show that the electronic bands do not fit into the rigid-band-shift picture after the Co intercalation. Instead, Co1/3NbS2 displays a different orbital character near the Fermi level compared to the pristine NbS2 compound and has a clear band dispersion in kz direction despite its layered structure. Our photoemission study demonstrates the out-of-plane electronic correlations introduced by the Co intercalation, thus offering a new perspective on this compound. Finally, we propose how Fermi level tuning could lead to exotic phases such as spin density wave instability.

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