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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260919T212631Z
LAST-MODIFIED:20130430T123331Z
DTSTART:20130503T180000Z
DTEND:20130503T190000Z
UID:event1104@bu.edu
URL:http://physics.bu.edu/internal/events/show/1104
SUMMARY:Defects in Topologically Ordered Quantum Matter
DESCRIPTION:Featuring Maissam Barkeshli\, Stanford University\n\nPart of th
	e HET Seminar Series.\n\nAbstract: Topologically ordered states are quantum
	 states of matter with various exotic properties such as topological ground
	 state degeneracies\, and quasiparticles with fractional quantum numbers an
	d fractional statistics. At long wavelengths\, these are described by topol
	ogical quantum field theories (TQFTs). In this talk\, I will describe a new
	 aspect of topologically ordered states---the twist defects. Twist defects 
	are extrinsic point defects in a topologically ordered state that couple to
	 its topological properties. A simple example includes the end-points of a 
	branch cut in a bilayer system\, around which the two layers are exchanged.
	 Such defects\, named ``genons"\, turn out to have rich topological propert
	ies and may be realizable in several physical systems. The concept of genon
	s and twist defects thus provides a new direction in the study of topologic
	al states of matter and topological quantum computation. In this talk I wil
	l first review the basic properties of genons and more general twist defect
	s\, and discuss recent proposals of realizing genons in fractional Chern in
	sulators (i.e. lattice fractional quantum Hall states) and conventional bil
	ayer quantum Hall states. I will also provide a unified description of the 
	most generic topological defects in Abelian topological states.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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