Bulletin of ANPA

Abstract submitted to ANPA Conference July 14–16, 2023

Volume 5, Number 1

Condensed Matter Physics and Material Science

Abstract ID: ANPA2023-N00068

Abstract:

ANPA2023-N00068: OBSERVATION OF FLAT BANDS AND DIRAC CONES IN A WEAKLY CORRELATED SEMIMETAL YRu2Si2

Authors:

• Anup Pradhan Sakhya; University of Central Florida

• Sabin Regmi; Department of Physics, University of Central Florida, Orlando, Florida 32816, USA

• Milo Sprague; Institute of Nuclear Physics, Polish Academy of Sciences, W. E. Radzikowskiego 152, PL-31342 Krakow, Poland

• Mazharul Islam Mondal; Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okolna 2, 50-422 Wroclaw, Poland

• Iftakhar Bin Elius;

• Nathan Valadez;

• Andrzej Ptok;

• Dariusz Kaczorowski;

• Madhab Neupane;

Topologically non-trivial materials, especially topological semimetals and metals have emerged as new frontiers in the study of quantum materials, propelled by the discovery of topological insulators. Herein, a high-quality YRu2Si2 single crystal was studied by employing angle-resolved photoemission spectroscopy supported by first-principles calculations along various high-symmetry directions. We present the experimental observation of flat bands along the X-N-X and N-G-N high-symmetry directions within the binding energy range of 200 meV which is very near to the Fermi level. These flat bands originate from Ru d orbitals and were found to be sensitive to the polarization of light. In addition, ARPES data revealed Dirac cones at the G and the X points. The observed ARPES data is in excellent agreement with the density functional theory results. The presence of both flat bands and Dirac fermions in YRu2Si2 suggests a unique synergy of correlation and topology in this material belonging to the centrosymmetric tetragonal ThCr2Si2-type structure thus establishing for the first time a new platform to investigate the flat band physics in combination with non-trivial topological states in a weakly correlated system.

To cite this abstract, use the following reference: https://anpaglobal.org/conference/2023/ANPA2023-N00068