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VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260919T212633Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110309T160000Z
DTEND:20110309T170000Z
UID:event783@bu.edu
URL:http://physics.bu.edu/internal/events/show/783
SUMMARY:SU(2)-invariant spin liquids on the triangular lattice with spinful
	 Majorana excitations
DESCRIPTION:Featuring Rudro Rana Biswas\, Harvard University\n\nPart of the
	 Condensed Matter Theory Seminar Series.\n\nAbstract: In this talk I will d
	escribe a new class of spin liquids with global SU(2) spin rotation symmetr
	y in spin 1/2 systems on the triangular lattice\, which have real Majorana 
	fermion excitations carrying spin S = 1. The simplest translationally-invar
	iant mean-field state on the triangular lattice breaks time-reversal symmet
	ry and is stable to fluctuations. It generically possesses gapless excitati
	ons along 3 Fermi lines in the Brillouin zone. These intersect at a single 
	point where the excitations scale with a dynamic exponent z = 3. An externa
	l magnetic field has no orbital coupling to the SU(2) spin rotation-invaria
	nt fermion bilinears that can give rise to a transverse thermal conductivit
	y\, thus leading to the absence of a thermal Hall effect. The Zeeman coupli
	ng is found to gap out two-thirds of the z = 3 excitations near the interse
	ction point and this leads to a suppression of the low temperature specific
	 heat\, the spin susceptibility and the Wilson ratio. I will also describe 
	physical properties in the presence of weak disorder and discuss possible c
	onnections to recent experiments on organic insulators.\n\nReference:  arXi
	v:1102.3690
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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