Work

Néel vector controlled exceptional contours in p-wave magnet-ferromagnet junctions

Year: 2025

Type: article

Abstract: Non-Hermitian (NH) systems can host exceptional degeneracies where not only the eigenvalues, but also the corresponding eigenvectors coalesce. Recently, p-wave magnets have been introduced, which are characterized by their unusual odd parity. In this work, we propose the emergence of NH degeneracies at the interface of p-wave magnets and ferromagnets. We demonstrate that this setup offers a remarkable tunability allowing realization of exceptional lines and rings, which can be controlled via the orientation of the p-wave Néel vector. We present the origin of these exceptional contours based on symmetry, and characterize them using phase rigidity. Our works puts forward a versatile platform to realize controllable NH degeneracies at odd parity magnetic interfaces.

Source: New Journal of Physics

DOI: 10.1088/1367-2630/ae00e9

Authors: Md Afsar Reja, Awadhesh Narayan

Institution: Indian Institute of Science Bangalore

Language: English

Topic: Quantum Mechanics and Non-Hermitian Physics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,610

Funder: Department of Science and Technology, Ministry of Science and Technology, India