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VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260814T100512Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20120309T170000Z
DTEND:20120309T180000Z
UID:event853@bu.edu
URL:http://physics.bu.edu/internal/events/show/853
SUMMARY:Spontaneous quantum Hall effect and fractionalization in itinerant 
	chiral magnets
DESCRIPTION:Featuring Ivar Martin\, Los Alamos National Laboratory\nHosted 
	by: Claudio Chamon\n\nPart of the Biophysics/Condensed Matter Seminar Serie
	s.\n\nAbstract:\nWhen electrons move in a magnetic material\, their transpo
	rt can be profoundly affected by scattering off magnetic ions. Converse is 
	also true: Itinerant electrons themselves can define the magnetic state int
	o which the system orders. Even though typically these magnetic states are 
	simple ­ e.g. ferromagnetic or antiferromagnetic ­ sometimes\, comp
	lex chiral magnetism can appear. In this talk I will present several exampl
	es of two- and three-dimensional itinerant models of magnetism that exhibit
	 complex non-coplanar ordering even in the absence of spin orbit interactio
	n; I will describe possible material realizations. Non-coplanar itinerant m
	agnets are expected to exhibit highly unusual transport phenomena that stem
	 from a quantum coherent effect of non-coplanar magnetic ordering on electr
	ons\, which is similar to the Aharonov-Bohm effect.  It can lead to th
	e spontaneous quantum Hall effect and ground-state electrical and spin curr
	ents. The equivalent strength of the orbital magnetic field can exceed 104 
	Tesla. The stable topological excitations (magnetic vortices) in these stat
	es can carry fractional electronic charge and spin and realize anyonic exch
	ange statistics.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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