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Disorder and topology in spin systems

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Resumo:Topological materials have gathered attention since the turn of the century due to the presence of several desirable properties such as chiral edge modes resilient disorder. Additionally, 2D magnetic materials have proven to have several desirable properties for implementation in spintronic devices. In the work pre sented in this thesis, the band-topological properties of certain 1D and 2D magnetic materials are explored, and the resilience and manipulation of these materials is probed, resorting to three types of real space disorder. Firstly, I present a novel way to manipulate topological properties of photo-induced topological ferromagnets using a strain engineering approach, with potential application in all-strain engineered topo logical spintronics. Secondly, I present a novel quasidisordered toy model showcasing for the first time the coexistence of 1D and 2D topological invariants in a purely 1D physical system. Such a system may be realizable in the context of spin systems and beyond. Lastly, some numerical and semi-analytical results on the impact of dilution in topological ferromagnets are presented, showcasing the resilience of topology to substitutional effects when a percentage of magnetic atoms is replaced by non-magnetic ones.
Autores principais:Antão, Tiago Vieira de Castro Martins
Assunto:Band topology Spin systems Magnons Haldane model SSH model Strain Quasicrystals Dilution Topologia de bandas Sistemas de spin Magnões Modelo de Haldane Modelo SSH Deformação Quasicristais Diluição
Ano:2023
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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