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Nonlinear localized modes in two-dimensional hexagonally-packed magnetic lattices

Chong, Christopher and Wang, Yifan and Maréchal, Donovan and Charalampidis, Efstathios G. and Molerón, Miguel and Martínez, Alejandro J. and Porter, Mason A. and Kevrekidis, Panayotis G. and Daraio, Chiara (2021) Nonlinear localized modes in two-dimensional hexagonally-packed magnetic lattices. New Journal of Physics, 23 (4). Art. No. 043008. ISSN 1367-2630. https://resolver.caltech.edu/CaltechAUTHORS:20210423-164902313

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Abstract

We conduct an extensive study of nonlinear localized modes (NLMs), which are temporally periodic and spatially localized structures, in a two-dimensional array of repelling magnets. In our experiments, we arrange a lattice in a hexagonal configuration with a light-mass defect, and we harmonically drive the center of the chain with a tunable excitation frequency, amplitude, and angle. We use a damped, driven variant of a vector Fermi–Pasta–Ulam–Tsingou lattice to model our experimental setup. Despite the idealized nature of this model, we obtain good qualitative agreement between theory and experiments for a variety of dynamical behaviors. We find that the spatial decay is direction-dependent and that drive amplitudes along fundamental displacement axes lead to nonlinear resonant peaks in frequency continuations that are similar to those that occur in one-dimensional damped, driven lattices. However, we observe numerically that driving along other directions results in asymmetric NLMs that bifurcate from the main solution branch, which consists of symmetric NLMs. We also demonstrate both experimentally and numerically that solutions that appear to be time-quasiperiodic bifurcate from the branch of symmetric time-periodic NLMs.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1088/1367-2630/abdb6fDOIArticle
https://arxiv.org/abs/2009.10300arXivDiscussion Paper
ORCID:
AuthorORCID
Chong, Christopher0000-0002-4908-3252
Wang, Yifan0000-0003-2284-520X
Charalampidis, Efstathios G.0000-0002-5417-4431
Porter, Mason A.0000-0002-5166-0717
Kevrekidis, Panayotis G.0000-0002-7714-3689
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2021 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 17 September 2020. Revised 29 December 2020. Accepted 13 January 2021. Published 5 April 2021. The present paper is based on work that was supported by the US National Science Foundation under Grant Nos. DMS-1615037 (CC), DMS-1809074 (PGK), and EFRI-1741565 (CD). AJM acknowledges support from the Agencia Nacional de Investigación y Desarrollo de Chile (ANID) under Grant No. 3190906. EGC thanks Bowdoin College, where the initial stages of this work were carried out, for their kind hospitality. PGK also acknowledges support from the Leverhulme Trust via a Visiting Fellowship and thanks the Mathematical Institute of the University of Oxford for its hospitality during part of this work. We give special thanks to Bowdoin undergraduates Ariel Gonzales, Patrycja Pekala, Anam Shah, and Steven Xu for help with simulations and data management. Data-availability statement. The data that support the findings of this study are available upon reasonable request from the authors.
Funders:
Funding AgencyGrant Number
NSFDMS-1615037
NSFDMS-1809074
NSFEFMA-1741565
Agencia Nacional de Investigación y Desarrollo (ANID)3190906
Leverhulme TrustUNSPECIFIED
Subject Keywords:breather, Fermi–Pasta–Ulam–Tsingou lattice, magnetic lattice, hexagonal lattice, nonlinear localized mode
Issue or Number:4
Record Number:CaltechAUTHORS:20210423-164902313
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210423-164902313
Official Citation:Christopher Chong et al 2021 New J. Phys. 23 043008
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108840
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 Apr 2021 14:09
Last Modified:29 Apr 2021 14:09

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