Eightfold fermionic excitation in a charge density wave compound
Name
PhysRevB.102.035125.pdf
Description
Published version
Size
2.39 MB
Format
Adobe PDF
Checksum (MD5)
dc883e2eeddcd2c95826830673aabdf5
Author(s)
Zhang, Xi
Gu, Qiangqiang
Sun, Haigen
Luo, Tianchuang
Liu, Yanzhao
Chen, Yueyuan
Shao, Zhibin
Zhang, Zongyuan
Li, Shaojian
Sun, Yuanwei
Date Issued
2020
Journal
Physical Review B
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevB.102.035125
