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DTSTAMP:20260917T113825Z
LAST-MODIFIED:20160219T182457Z
DTSTART:20160223T190000Z
DTEND:20160223T200000Z
UID:event1545@bu.edu
URL:http://physics.bu.edu/internal/events/show/1545
SUMMARY:Non-perturbative Results for Itinerant Ferromagnetism in Multi-orbi
	tal Systems
DESCRIPTION:Featuring Yi Li\, Princeton\n\nPart of the Biophysics/Condensed
	 Matter Seminar Series.\n\nItinerant ferromagnetism (FM) is intrinsically a
	 strongly correlated phenomenon\, which remains a major challenge of conden
	sed matter physics. Most FM materials are orbital-active with prominent Hun
	d’s coupling. However\, the local physics of Hund’s rule usually does n
	ot lead to the FM long-range order. Furthermore\, the magnetic phase transi
	tions of itinerant electrons are also long-standing problems difficult to h
	andle by using perturbative methods. In this talk\, I will present non-pert
	urbative studies on itinerant FM. Exact theorems are established for a stab
	le itinerant FM phase in a large region of electron densities in multi-orbi
	tal systems\, which provide sufficient conditions for Hund’s rule to buil
	d up global FM coherence. In addition\, thermodynamic properties and magnet
	ic phase transitions of itinerant electrons are studied via sign-problem-fr
	ee quantum Monte Carlo simulations at generic fillings. Without introducing
	 local moments as a priori\, the Curie-Weiss metal behavior is identified i
	n a wide range of temperatures. These results will provide important guidan
	ce to the current experimental search for novel itinerant FM states in a la
	rge class of systems ranging from the transition-metal-oxide heterostructur
	es (e.g. LaAlO3/SrTiO3) to the p-orbital bands in optical lattices filled w
	ith ultra-cold fermions.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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