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DTSTAMP:20261018T141017Z
LAST-MODIFIED:20190228T144552Z
DTSTART:20190228T160000Z
DTEND:20190228T170000Z
UID:event2122@bu.edu
URL:http://physics.bu.edu/internal/events/show/2122
SUMMARY:Seeing beyond the light: Vison and photon electrodynamics in quantu
	m spin ice
DESCRIPTION:Featuring Attila Szabó\, University of Cambridge\nHosted by: S
	iddhardh Morampudi\n\nPart of the Condensed Matter Theory Seminar Series.\n
	\nUnderstanding the nature and behaviour of excitations in quantum spin liq
	uids\, and in topological phases of matter in general\, is of fundamental i
	mportance and has proved crucial for experimental detection and characteris
	ation of candidate materials. Current theoretical and numerical techniques\
	, however\, have limited capabilities\, especially when it comes to studyin
	g gapped excitations. In this talk\, I will discuss a semiclassical numeric
	al method\, based on large-$S$ path integral approach\, to study a wide cla
	ss of systems whose spin liquid behaviour is underpinned by perturbative ri
	ng-exchange Hamiltonians. Our method can readily access both thermodynamic 
	and spectral properties.\n\nI will focus in particular on quantum spin ice 
	and its photon and vison excitations. After benchmarking the method against
	 existing results on photons\, we used it to characterise visons and their 
	thermodynamic behaviour. We find that visons form a weak electrolyte -- in 
	contrast to spinons in classical spin ice --\, that is\, vison pairs are th
	e dominant population at low temperatures. This is reflected in the behavio
	ur of thermodynamic quantities\, such as pinch point motifs in the relevant
	 correlators. Moreover\, visons appear to strongly hybridise with the photo
	n background\, a phenomenon that gravely affects the way these quasiparticl
	es may show up in inelastic response measurements.\n\nWe believe that gener
	alisations of our method can substantially extend our understanding of quas
	iparticles and their interplay in quantum spin ice and other quantum spin l
	iquids\, quantum dimer models\, and lattice gauge theories in general.
LOCATION:PRB 261\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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