Observations of nodal lines in the topological semimetal ZrSnTe

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 111-116
• 页数: 6页
• 语种: 英文

摘要

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.