Bulk and edge spin transport in topological magnon insulators

A. Rückriegel, A. Brataas, R.A. Duine

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)
153 Downloads (Pure)

Abstract

We investigate the spin transport properties of a topological magnon insulator, a magnetic insulator characterized by topologically nontrivial bulk magnon bands and protected magnon edge modes located in the bulk band gaps. Employing the Landau-Lifshitz-Gilbert phenomenology, we calculate the spin current driven through a normal metal|topological magnon insulator|normal metal heterostructure by a spin accumulation imbalance between the metals, with and without random lattice defects. We show that bulk and edge transport are characterized by different length scales. This results in a characteristic system size where the magnon transport crosses over from being bulk dominated for small systems to edge dominated for larger systems. These findings are generic and relevant for topological transport in systems of nonconserved bosons.

Original languageEnglish
Article number081106
Number of pages5
JournalPhysical Review B
Volume97
Issue number8
DOIs
Publication statusPublished - 14 Feb 2018

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