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Self-organized pseudo-graphene on grain boundaries in topological band insulators
Slager, Robert-Jan ;  Juricic, Vladimir ;  Lahtinen, Ville Tapani ;  Zaanen, Jan

HaupttitelSelf-organized pseudo-graphene on grain boundaries in topological band insulators
AutorSlager, Robert-Jan
AutorJuricic, Vladimir
AutorLahtinen, Ville Tapani
AutorZaanen, Jan
Seitenzahl11 Seiten
DDC530 Physik
Auch erschienen inPhysical Review B. - 93 (2016), 24, Artikel Nr. 245406
ZusammenfassungSemimetals are characterized by nodal band structures that give rise to exotic electronic properties. The stability of Dirac semimetals, such as graphene in two spatial dimensions, requires the presence of lattice symmetries, while akin to the surface states of topological band insulators, Weyl semimetals in three spatial dimensions are protected by band topology. Here we show that in the bulk of topological band insulators, self-organized topologically protected semimetals can emerge along a grain boundary, a ubiquitous extended lattice defect in any crystalline material. In addition to experimentally accessible electronic transport measurements, these states exhibit a valley anomaly in two dimensions influencing edge spin transport, whereas in three dimensions they appear as graphenelike states that may exhibit an odd-integer quantum Hall effect. The general mechanism underlying these semimetals—the hybridization of spinon modes bound to the grain boundary—suggests that topological semimetals can emerge in any topological material where lattice dislocations bind localized topological modes.
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Fachbereich/EinrichtungFB Physik
Arbeitsbereich/InstitutInstitut für Theoretische Physik
Erscheinungsjahr2016
Dokumententyp/-SammlungenWissenschaftlicher Artikel
SpracheEnglisch
RechteCopyright des Verlags
Erstellt am02.03.2017 - 00:00:00
Letzte Änderung02.03.2017 - 00:00:00
 
Statische URLhttp://edocs.fu-berlin.de/docs/receive/FUDOCS_document_000000026527
SEPID55782
ISSN2469-9950
DOI10.1103/PhysRevB.93.245406
Zugriffsstatistik
 

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