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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20261021T144056Z
LAST-MODIFIED:20170405T183521Z
DTSTART:20170413T174500Z
DTEND:20170413T184500Z
UID:event1755@bu.edu
URL:http://physics.bu.edu/internal/events/show/1755
SUMMARY:Metamagnets: How Do They Work?
DESCRIPTION:Featuring Adam Iaizzi\n\nPart of the Departmental Seminars.\n\n
	Dissertation Committee:  Anders Sandvik\, Claudio Chamon\, David Campbell\,
	 Robert Carey\, Shyam Erramilli\n\nAbstract:\n\nA wide variety of physical 
	phenomena can be studied by considering only a lattice of localized spins w
	ith short-range interactions. I present a series of large-scale studies of 
	one such spin model—the J-Q model—conducted using the stochastic series
	 expansion quantum Monte Carlo method. By imposing an external magnetic fie
	ld\, I demonstrate that J-Q model undergoes magnetization jumps to saturati
	on above a critical coupling ratio qmin (below which the transition to satu
	ration is continuous). These jumps are an example of metamagnetism\, a type
	 of first-order quantum phase transition.  Using a high-magnetization expan
	sion\, I determine qmin exactly and show that the magnetization jumps are c
	aused by the onset of bound states of magnons (flipped spins against a full
	y polarized background). I will also discuss the magnetization near saturat
	ion for q
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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