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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260801T031355Z
LAST-MODIFIED:20151007T192737Z
DTSTART:20151009T160000Z
DTEND:20151009T173000Z
UID:event1503@bu.edu
URL:http://physics.bu.edu/internal/events/show/1503
SUMMARY:Breakdown of the topological classification for gapped phases of no
	ninteracting fermions by quartic interactions
DESCRIPTION:Featuring Christopher Mudry\, PSI\, Switzerland\n\nPart of the 
	Biophysics/Condensed Matter Seminar Series.\n\nThe conditions for both the 
	stability and the breakdown of the\n  topological classification of gapped 
	ground states of noninteracting fermions\, the tenfold way\, in the presenc
	e of quartic fermion-fermion interactions are given for any dimension of sp
	ace. This is achieved by encoding the effects of interactions on the bounda
	ry gapless modes in terms of boundary dynamical masses. Breakdown of the no
	ninteracting topological classification occurs when the quantum nonlinear s
	igma models  for the boundary dynamical masses favor quantum disordered pha
	ses. For the tenfold way\, we find that (i) the noninteracting topological 
	classification Z2 is always stable\, (ii) the noninteracting topological cl
	assification Z in even dimensions is always stable\, (iii) the noninteracti
	ng topological classification Z in odd dimensions is unstable and reduces t
	o ZN that can be identified explicitly for any dimension and any defining s
	ymmetries. We also apply our method to the three-dimensional topological cr
	ystalline insulator SnTe from the symmetry class AII+R\, for which we estab
	lish the reduction from Z to Z8 of the noninteracting topological classific
	ation.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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