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-N00069

Abstract:

ANPA2023-N00069: Observation of 3D Dirac state in antiferromagnetic topological material EuMg2Bi2

Authors:

• Mazharul Islam Mondal; University of Central Florida

• Milo X. Sprague ;

• Anup Pradhan Sakhya;

• Sabin Regmi;

• Fairoja Cheenicode-Kabeer;

• Iftakhar Bin Elius;

• Alex Aperis;

• Peter M. Oppeneer;

• Dariusz Kaczorowski;

• Madhab Neupane;

Topological Dirac semimetals, systems containing low energy relativistic Dirac quasiparticle excitations, have received ample attention in condensed matter physics. Early work on Dirac semimetals focused on nonmagnetic systems with the presence of time reversal symmetry. Recent interest has turned toward the study of magnetic Dirac materials. Here, we have performed electrical resistivity, magnetization, and specific heat capacity measurements of an Eu-ternary pnictide EuMg2Bi2 and confirm the existence of antiferromagnetic ordering below the temperature of 6.7 K. Furthermore, we have studied the electronic structure of EuMg2Bi2 by utilizing high-resolution angle-resolved photoemission spectroscopy (ARPES) which is supplemented by first-principles calculations. Our ARPES measurement reveals the electronic structure of this system is dominated by linearly dispersive hole-like bands near the Fermi level. Our first principles calculations show excellent agreement with these observations. Our results also suggest the presence of a single Dirac cone above the experimental Fermi level. These findings open a platform to study the interplay between topology and magnetism.

To cite this abstract, use the following reference: https://anpaglobal.org/conference/2023/ANPA2023-N00069