Collective Excitations in Chiral Stoner Magnets

Autor:	Zhiyu Dong, Olumakinde Ogunnaike, Leonid Levitov
Rok vydání:	2023
Předmět:	Condensed Matter - Strongly Correlated Electrons Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Mesoscale and Nanoscale Physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences General Physics and Astronomy
Zdroj:	Physical Review Letters. 130
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.130.206701
Popis:	We argue that spin and valley-polarized metallic phases recently observed in graphene bilayers and trilayers support chiral edge modes that allow spin waves to propagate ballistically along system boundaries without backscattering. The chiral edge behavior originates from the interplay between the momentum-space Berry curvature in Dirac bands and the geometric phase of a spin texture in position space. The edge modes are weakly confined to the edge, featuring dispersion which is robust and insensitive to the detailed profile of magnetization at the edge. This unique character of edge modes reduces their overlap with edge disorder and enhances the mode lifetime. The mode propagation direction reverses upon reversing valley polarization, an effect that provides a clear testable signature of geometric interactions in isospin-polarized Dirac bands. 8pgs, 2fgs
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b5c2892f8348a69cc49eb0c95e74976 https://doi.org/10.1103/physrevlett.130.206701 Zobrazit plný text záznamu