SKM 2023 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 14: Development of Computational Methods: Thermodynamics and Local Chemistry, Electronic Structure

MM 14.7: Talk

Tuesday, March 28, 2023, 12:00–12:15, SCH A 251

electronic structure of a non-symmorphic kondo lattice system CeAgSb2 — •Sawani Datta¹, Khadiza Ali², Rahul Verma¹, Saroj p. Dash², Bahadur Singh¹, Arumugam Thamizhavel¹, and Kalobaran Maiti¹ — ¹Tata institute of fundamental research, Mumbai, India — ²Chalmers university of technology, Goteborg, Sweden

Topological Dirac semimetal with non-symmorphic symmetry (NSS) is one of the most recent discoveries in the field of novel topological quantum materials [1]. The uniqueness of this system is the presence of robust (including spin-orbit coupling) Dirac line nodes with NSS protection. CeAgSb2, a Kondo system, exhibits a large anisotropic resistivity and a complex magnetic ground state at a lower temperature [2]. Employing angle-resolved photoemission spectroscopy (ARPES), we find that CeAgSb2 possesses several non-trivial crossings near the Fermi level protected by the NSS. The ARPES data collected at different photon energies suggest a quasi-2-D behavior which is consistent with the transport results. In addition, we observe energy bands of the surface states in the near-Fermi-level region along with the non-trivial bulk bands that make the electronic structure complex. Our study shows the CeAgSb2 family of materials as a new platform to study the robust non-symmorphic symmetry-protected Dirac semi-metallic systems with high spin-orbit coupling.

[1] L. M. Schoop et. al., Nat. Commun. 7, 11696 (2016). [2] Y. Inada et. al., Philos. Mag. B, 82, 1867 (2002).