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BEGIN:VEVENT
DTSTAMP:20260914T121925Z
LAST-MODIFIED:20160303T194350Z
DTSTART:20160309T160000Z
DTEND:20160309T180000Z
UID:event1563@bu.edu
URL:http://physics.bu.edu/internal/events/show/1563
SUMMARY:Filling constraints for spin-orbit coupled insulators in symmorphic
	 and nonsymmorphic crystals
DESCRIPTION:Featuring Haruki Watanabe\, University of Tokyo\n\nPart of the 
	Condensed Matter Theory Seminar Series.\n\nQuantum spin liquids are exotic 
	insulators in which the electron’s spin\, charge\, and fermionic statisti
	cs are carried by separate excitations. They have received attention for th
	eir potential as a quantum memory and as a parent state for high-temperatur
	e superconductivity. A key principle guiding the search for experimental ca
	ndidate materials is the absence of conventional order in insulators at "fr
	actional" electron filling. Previous results established what constitutes f
	ractional filling\, but assumed the spin rotation symmetry that is typicall
	y broken in real materials by spin-orbit couplings.  In this talk\, assumin
	g the time-reversal symmetry instead of the spin conservation\, we establis
	h useful filling conditions for all 230 space groups. This should aid in th
	e search for quantum spin liquids and topological semimetals.  We will also
	 discuss its implication on noninteracting band structures and introduce a 
	new type of topological crystalline insulator\, which we call `filling-enfo
	rced quantum band insulators’.\n\nRef:\n[1] HW\, H.C. Po\, A. Vishwanath\
	, & M. Zaletel\, PNAS 112\, 14551 (2015)\n[2] H.C. Po\, HW\, M. Zaletel & A
	. Vishwanath\, arXiv:1506.03816
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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