Kavli Affiliate: Gang Su
| First 5 Authors: Jia-Wen Li, Jia-Wen Li, , ,
| Summary:
Curved magnets offer a rich phase diagram and hold great promise for
next-generation spintronic technologies. This study establishes the paramount
significance of high-order vortex states (e.g., 3$varphi$ with winding number
$n$ > 1) in VSe2 nanotubes, which uniquely enable magnonic functionalities
fundamentally inaccessible to conventional magnetic systems. These states arise
from diameter-dependent competition between the nearest-neighbor ferromagnetic
($J_1$) and longer-range antiferromagnetic ($J_2$/$J_3$) couplings, as
rigorously validated through density-functional theory calculations and
Heisenberg modeling of phase diagrams. Critically, by the
Landau-Lifshitz-Gilbert equation, we find that high-order vortex configurations
unlock an intrinsic hybridization mechanism governed by strict orbital angular
momentum (OAM) selection rules ($Delta l = pm 2(n-1)$) — a process strictly
forbidden in fundamental vortices ($n$ = 1) — generating complex high-OAM
magnons with measurable topological charge. This is vividly demonstrated in the
3$varphi$ state, where hybridization between $l$ = -4, 0 and 4 modes produces
eight-petal magnon density patterns. Such states provide an essential
platform-free solution for generating high-OAM magnons, wchich is crucial for
spin-wave-based information transport. These findings establish a predictive
theoretical framework for controlling high-order vortex states in curved
magnets and highlight VSe2 nanotubes as a promising platform for exploring
complex magnetism and developing future magnonic and spintronic devices.
| Search Query: ArXiv Query: search_query=au:”Gang Su”&id_list=&start=0&max_results=3