@article{da56d76035534c14bcc85508ea8f676b,
title = "Eightfold fermionic excitation in a charge density wave compound",
abstract = "Unconventional quasiparticle excitations in condensed matter systems have become one of the most important research frontiers. Beyond twofold and fourfold degenerate Weyl and Dirac fermions, threefold, sixfold, and eightfold symmetry protected degeneracies have been predicted. However they remain challenging to realize in solid state materials. Here the charge density wave compound TaTe4 is proposed to hold eightfold fermionic excitation and Dirac point in energy bands. High quality TaTe4 single crystals are prepared, where the charge density wave is revealed by directly imaging the atomic structure and a pseudogap of about 45 meV on the surface. Shubnikov-de Haas oscillations of TaTe4 are consistent with band structure calculation. Scanning tunneling microscopy/spectroscopy reveals atomic step edge states on the surface of TaTe4. This work uncovers that the charge density wave is able to induce new topological phases and sheds new light on the novel excitations in condensed matter materials.",
author = "Xi Zhang and Qiangqiang Gu and Haigen Sun and Tianchuang Luo and Yanzhao Liu and Yueyuan Chen and Zhibin Shao and Zongyuan Zhang and Shaojian Li and Yuanwei Sun and Yuehui Li and Xiaokang Li and Shangjie Xue and Jun Ge and Ying Xing and R. Comin and Zengwei Zhu and Peng Gao and Binghai Yan and Ji Feng and Minghu Pan and Jian Wang",
note = "This work was financially supported by the National Key R&D Program of China (Grants No. 2018YFA0305600, No. 2017YFA0303302, and No. 2016YFA0301004), the National Natural Science Foundation of China (Grants No. 11888101, No. 11774008, No. 11574095, No. 91745115, No. 11725415, and No. 51672007), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000), Beijing Natural Science Foundation (Z180010), and the Postdoctoral Innovative Talent Support Program of China (No. BX20200202). B.Y. acknowledges the financial support by the Willner Family Leadership Institute for the Weizmann Institute of Science, the Benoziyo Endowment Fund for the Advancement of Science, Ruth and Herman Albert Scholars Program for New Scientists. We gratefully acknowledge Gatan for the technique help. The authors acknowledge Electron Microscopy Laboratory in Peking University for the use of the Cs corrected electron microscope. X.Z., Q.G., H.S., and T.L. contributed equally to this work.",
year = "2020",
month = jul,
day = "15",
doi = "https://doi.org/10.1103/PhysRevB.102.035125",
language = "الإنجليزيّة",
volume = "102",
number = "3",
}