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BEGIN:VEVENT
DTSTAMP:20260813T020826Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110119T200000Z
DTEND:20110119T210000Z
UID:event762@bu.edu
URL:http://physics.bu.edu/internal/events/show/762
SUMMARY:Elsa Abreu - Preliminary Oral Examination
DESCRIPTION:\nPart of the Preliminary Oral Exam.\n\nTitle: Ultrafast spectr
	oscopy of strongly correlated systems – VO2 and Sr14Cu24O41\n\nExamining 
	Committee:  Richard Averitt\, Shyamsunder Erramilli\,\nClaudio Chamon\, Rob
	ert Carey\n\nAbstract:\n\n  \nWe use ultrafast spectroscopy in the THz and 
	optical regimes to study the static and dynamic properties of systems with 
	strong electron correlations.\nIn particular\, we are interested in underst
	anding the nature of the metal-insulator transition (MIT) in VO2. We have o
	bserved a large strain induced anisotropy in both the conductivity and the 
	transition temperature of strained VO2 thin films\, probed by THz time doma
	in spectroscopy (Fig.1). These results demonstrate the possibility of strai
	n engineering the properties of VO2\, while shedding a new light onto a lon
	g lasting controversy regarding the structural vs. correlation driven natur
	e of the MIT in this material.\nWe are also interested in probing the dynam
	ics of Sr14Cu24O41\, a quasi-1D compound which exhibits superconductivity w
	hen appropriately doped with Ca. Sr14Cu24O41 consists of stacked layers of 
	alternating 1D CuO2 chains and quasi-1D Cu2O3 ladders. Preliminary results 
	reveal contributions from both chains and ladders dynamics in the temperatu
	re dependent THz response of the material.\n\nBest wishes to Elsa!!!
LOCATION:PRB 365\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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