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dc.contributor.author김경환-
dc.contributor.authorKei Yamamoto-
dc.contributor.authorGuo Chuan Thiang-
dc.contributor.authorPhilipp Pirro-
dc.contributor.authorKarin Everschor-Sitte-
dc.contributor.authorEiji Saitoh-
dc.date.accessioned2019-05-30T15:30:01Z-
dc.date.available2019-05-30T15:30:01Z-
dc.date.issued2019-05-
dc.identifier.issn0031-9007-
dc.identifier.other52784-
dc.identifier.urihttp://pubs.kist.re.kr/handle/201004/62287-
dc.description.abstractWe propose a topological characterization of Hamiltonians describing classical waves. Applying it to the magnetostatic surface spin waves that are important in spintronics applications, we settle the speculation over their topological origin. For a class of classical systems that includes spin waves driven by dipole-dipole interactions, we show that the topology is characterized by vortex lines in the Brillouin zone in such a way that the symplectic structure of Hamiltonian mechanics plays an essential role. We define winding numbers around these vortex lines and identify them to be the bulk topological invariants for a class of semimetals. Exploiting the bulk-edge correspondence appropriately reformulated for these classical waves, we predict that surface modes appear but not in a gap of the bulk frequency spectrum. This feature, consistent with the magnetostatic surface spin waves, indicates a broader realm of topological phases of matter beyond spectrally gapped ones.-
dc.publisherPhysical review letters-
dc.subject위상학-
dc.subject스핀파-
dc.titleTopological Characterization of Classical Waves: The Topological Origin of Magnetostatic Surface Spin Waves-
dc.typeArticle-
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