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-N00070

Abstract:

ANPA2023-N00070: Observation of Spin-Degeneracy Lifting in Paramagnetic EuZn2Sb2

Authors:

• Milo Sprague; University of Central Florida

• Sabin Regmi; University of Central Florida

• Barun Ghosh; Northeastern University

• Anup Pradhan Sakhya; University of Central Florida

• Mazharul Islam Mondal; University of Central Florida

• Iftakhar Bin Elius; University of Central Florida

• Nathan Valadez; University of Central Florida

• Bahadur Singh; Tata Institute of Fundamental Research

• Tetiana Romanova; Institute of Low Temperature and Structure Research

• Dariusz Kaczorowski; Institute of Low Temperature and Structure Research

• Arun Bansil; Northeastern University

• Madhab Neupane; University of Central Florida

The simultaneous presence of time-reversal symmetry and spatial inversion symmetry imposes a two-fold degeneracy of the bands structure of a solid. Typically, the lifting of this degeneracy in centrosymmetric materials is indicative of long-range magnetization. However, correlated alignment of spins, even in a paramagnetic sample, is also capable of lifting the spin-degeneracy of the electronic states. We report the observation of parallel dispersing split bands in Eu-ternary pnictide EuZn2Sb2 through the use of high-resolution ARPES. Our DFT calculations account for the observed splitting by including the effects of long-range ferromagnetic correlation of the spins. These results indicate the possibility of observing further time-reversal violating physics in non-magnetic materials.

To cite this abstract, use the following reference: https://anpaglobal.org/conference/2023/ANPA2023-N00070