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SUMMARY:Self-organized pseudo-grapheme on grain boundaries in topological 
 band insulators - Ville Lahtinen\, Freie Universität Berlin
DTSTART:20151027T110000Z
DTEND:20151027T120000Z
UID:TALK62086@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:Semi-metallic materials\, such as graphene in two dimensions (
 2D) and various Dirac and Weyl semi-metals in three dimensions (3D)\, are 
 characterized by nodal band structures that give rise to exotic electronic
  properties. Their stability requires the presence of lattice symmetries o
 r application of external fields\, making them lack the inherent topologic
 al protection enjoyed by surface states of topological band insulators. He
 re we bridge this divide by showing that a self-organized topologically pr
 otected semi-metals\, that in 1D exhibit an edge spin transport influencin
 g valley anomaly and in 2D appear as a graphene-like semi-metal characteri
 zed by odd-integer quantum Hall effect\, can emerge and be experimentally 
 observed on extended defects in topological insulators. In particular\, th
 ese states emerge on a grain boundary\, a ubiquitous lattice defect in any
  crystalline material\, thereby providing a novel and experimentally acces
 sible route to topological semi-metals. The underlying mechanism is the hy
 bridization of spinon modes bound to the grain boundary\, whose generality
  suggests that new states of matter can emerge in any topological band ins
 ulator where lattice dislocations bind localized topological modes.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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