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BEGIN:VEVENT
DTSTAMP:20260804T012851Z
LAST-MODIFIED:20180926T142054Z
DTSTART:20181010T190000Z
DTEND:20181010T200000Z
UID:event2020@bu.edu
URL:http://physics.bu.edu/internal/events/show/2020
SUMMARY:Vestigial orders in electronic correlated systems: nematicity and b
	eyond
DESCRIPTION:Featuring Rafael Fernandes\, University of Minnesota\nHosted by
	: Wanzheng Hu\n\nPart of the Condensed Matter Theory Seminar Series.\n\nA h
	allmark of the phase diagrams of correlated electronic systems is the exist
	ence of multiple electronic ordered states. In many cases\, they cannot be 
	simply described as independent competing phases\, but instead display a co
	mplex intertwinement. A prime example of intertwined states is the case of 
	primary and vestigial phases. While the former is characterized by a multi-
	component order parameter\, the fluctuation-driven vestigial state is chara
	cterized by a composite order parameter formed by higher-order\, symmetry-b
	reaking combinations of the primary order parameter. This concept has been 
	widely employed to elucidate nematicity in both iron-based and cuprate supe
	rconductors. In this talk\, I will present a group-theoretical framework\, 
	supplemented by microscopic calculations\, that extends this notion to a va
	riety of phases\, providing a general classification of vestigial orders of
	 unconventional superconductors and density-waves. Electronic states with s
	calar and vector chiral order\, spin-nematic order\, Ising-nematic order\, 
	time-reversal symmetry-breaking order\, and algebraic vestigial order emerg
	e from this simple underlying principle. I will present a rich variety of p
	ossible phase diagrams involving the primary and vestigial orders\, and dis
	cuss possible realizations of these exotic composite orders in different ma
	terials.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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