Abstract
Performing angle-resolved photoemission spectroscopy (ARPES) and theoretical calculations for ZrSnTe, we find a nodal line in the kx-ky plane with a tiny gap and two nodal lines without gaps along the kz direction. The constant energy contours are plotted in the kx-ky plane at a photon energy of 30 eV to examine the gapping feature of the nodal line. In addition, we depict the band dispersions along the Γ-M and Γ-X directions from the ARPES images at photon energies ranging from 24 to 40 eV. The kz mapping confirms the presence of stable Dirac points with obvious kz dependences along the M-A and X-R directions. In this paper, we report the two types of nodal lines associated with the theoretical local-density approximation calculations, broadening the horizons of nodal-line semimetal research.
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This work was supported by the National Key R&D Program of China (Grant No. 2018YFA0306800), the National Natural Science Foundation of China (Grant Nos. 11714154, 11790311, and 11774151), the Fundamental Research Funds for the Central Universities (Grant No. 020414380110), and the Program for High-Level Entrepreneurial and Innovative Talents Introduction, Jiangsu Province.
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Chen, B., Zhang, B., Yu, J. et al. Observations of nodal lines in the topological semimetal ZrSnTe. Sci. China Phys. Mech. Astron. 63, 227011 (2020). https://doi.org/10.1007/s11433-019-9448-8
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DOI: https://doi.org/10.1007/s11433-019-9448-8