Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets

D. Quang To; Dai Q. Ho; Joshua M. O. Zide; Lars Gundlach; M. Benjamin Jungfleisch; Garnett W. Bryant; Anderson Janotti; Matthew F. Doty

doi:10.1103/ttgm-bq6b

Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets

D. Quang To ^1,*, Dai Q. Ho ^1,2, Joshua M. O. Zide ¹, Lars Gundlach³, M. Benjamin Jungfleisch ⁴, Garnett W. Bryant ^5,6, Anderson Janotti¹, and Matthew F. Doty ^1,†

¹Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, USA
²Faculty of Natural Sciences, Quy Nhon University, Quy Nhon 55113, Vietnam
³Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
⁴Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
⁵Nanoscale Device Characterization Division, Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8423, USA
⁶University of Maryland, College Park, Maryland 20742, USA

^*Contact author: quangto@udel.edu
^†Contact author: doty@udel.edu

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Phys. Rev. Materials 9, 074409 – Published 21 July, 2025

DOI: https://doi.org/10.1103/ttgm-bq6b

Abstract

We theoretically investigate the intrinsic magnon orbital Nernst effect (ONE) in noncollinear antiferromagnets with kagome spin systems. Our analysis reveals that an externally applied magnetic field induces topological phase transitions in the magnonic system, characterized by the closing and reopening of the band gap between distinct magnon bands. These transitions enable tunable control of the magnon ONE with applied magnetic field, with a pronounced enhancement in magnon orbital Nernst conductivity near the phase transition points. This tunability presents a promising direction for experimental detection of the magnon ONE.

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Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets

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Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets

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