Charge order induced Dirac pockets in the nonsymmorphic crystal TaTe${}_4$

Abstract

The interplay between charge order (CO) and nontrivial band topology has spurred tremendous interest in understanding topological excitations beyond the single-particle description. In a quasi-one-dimensional nonsymmorphic crystal TaTe${}_4$, the (2a$\times$2b$\times$3c) charge ordered ground state drives the system into a space group where the symmetry indicator features the emergence of Dirac fermions and unconventional double Dirac fermions. Using angle-resolved photoemission spectroscopy and first-principles calculations, we provide evidence of the CO induced Dirac fermion-related bands near the Fermi level. Furthermore, the band folding at the Fermi level is compatible with the new periodicity dictated by the CO, indicating that the electrons near the Fermi level follow the crystalline symmetries needed to host double Dirac fermions in this system.

9 pages, 4 figures. The authorship of this paper has been amended to include new coauthors Dr. Gregory T. McCandless and Dr. Julia Y. Chan of Department of Chemistry and Biochemistry, Baylor University. Drs. McCandless and Chan were responsible for x-ray characterization of the sample used in this study. Erratum to be published on Phys. Rev. B

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Cited by in corpus (2)

• Kramers nodal lines in intercalated TaS${}_2$ superconductors
• Fermi Surface Reconstruction and Anisotropic Linear Magnetoresistance in the Charge Density Wave Topological Semimetal TaTe4