Domain wall formation and magnon localization in twisted chromium trihalides

TL;DR

This paper reviews recent advances in twisted two-dimensional magnetic materials, focusing on how twist angles influence domain formation and magnon behavior, with specific insights into chromium trihalides and CrI₃.

Contribution

It provides a concise overview of theoretical and experimental findings on twist-induced magnetic phenomena in 2D materials, highlighting new effects in chromium trihalides.

Findings

Twist angles affect antiferromagnetic domain formation.

Stacking influences spin-wave dispersion in CrI₃.

Preliminary results show twist modifies magnon properties.

Abstract

The rise of twistronics has revolutionized the field of condensed matter physics, and more specifically the future applications of two-dimensional materials. At small twist angles, the microscopic world becomes strongly correlated, and unexpected physical phenomena such as superconductivity emerge. For magnetic layers, stacking plays a crucial role in the magnetic exchange coupling between the layers leading to non-trivial spin configurations and flat spin-wave dispersion when twisted. In this work, we give a short overview of the most recent theoretical and experimental works reporting the effect of twist angles on two-dimensional magnets. Besides, we discuss the effect of the twist angle and the local antiferromagnetic interlayer exchange coupling on the formation of antiferromagnetic domains in chromium trihalides. Finally, we show some preliminary results on the effect of the stacking and the twist angle on the spin-wave dispersion of bilayer CrI$_3$