Observation of multiple nodal-lines in SmSbTe

Abstract

Having been a ground for various topological fermionic phases, the family of ZrSiS-type 111 materials has been under experimental and theoretical investigations. Within this family of materials, the subfamily LnSbTe (Ln = lanthanide elements) is gaining interests in recent times as the strong correlation effects and magnetism arising from the 4f electrons of the lanthanides can provide an important platform to study the linking between topology, magnetism, and correlation. In this paper, we report the systematic study of the electronic structure of SmSbTe - a member of the LnSbTe subfamily - by utilizing angle-resolved photoemission spectroscopy in conjunction with first-principles calculations, transport, and magnetic measurements. Our experimental results identify multiple Dirac nodes forming the nodal-lines along the G- X and Z- R directions in the bulk Brillouin zone (BZ) as predicted by our theoretical calculations. A surface Dirac-like state that arises from the square net plane of the Sb atoms is also observed at the X point of the surface BZ. Our study highlights SmSbTe as a promising candidate to understand the topological electronic structure of LnSbTe materials.

arXiv comment7 pages, 4 figures

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• Evolution of Magnetism in Magnetic Topological Semimetal NdSb${}_x$Te${}_{2-x+\delta }$
• Evolution of Electronic and Magnetic Properties in Topological Semimetal SmSbxTe2-x
• Colossal negative magnetoresistance in the complex charge density wave regime of an antiferromagnetic Dirac semimetal
• Electronic band structure and surface states in Dirac semimetal LaAgSb${}_2$
• Electronic structure in a rare-earth based nodal-line semimetal candidate PrSbTe
• Large Negative Magnetoresistance in off-Stochiometric Topological Material PrSbTe
• Low-lying Electronic Structure of Rare-Earth Based Topological Nodal Line Semimetal Candidate DySbTe
• Electronic Structure of a Nodal Line Semimetal Candidate TbSbTe
• Electronic band structure of a nodal line semimetal candidate ErSbTe
• Evolution of Magnetoresistance in the magnetic topological semimetals NdSbxTe2-x
• Chalcogen Doping Effect on the Insulator-to-Metal Transition in GdPS