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BEGIN:VEVENT
DTSTAMP:20260911T184330Z
LAST-MODIFIED:20130416T202518Z
DTSTART:20130419T160000Z
DTEND:20130419T170000Z
UID:event1039@bu.edu
URL:http://physics.bu.edu/internal/events/show/1039
SUMMARY:Ultrafast spectroscopy of electronic dynamics in complex materials
DESCRIPTION:Featuring Robert A. Kaindl\, Lawrence Berkeley National Lab.\nH
	osted by: Richard Averitt\n\nPart of the Biophysics/Condensed Matter Semina
	r Series.\n\nAbstract:\nThe doping of charges in Mott insulators gives rise
	 to a wealth of new phenomena including high-TC superconductivity\, colossa
	l magnetoresistance or metal-insulator transitions. Self-organized electron
	ically-ordered phases are a recurring feature in such materials\, resulting
	 e.g. in fluctuating stripes whose role for the high-TC mechanism is under 
	debate. However\, the cause-effect relations between low-energy excitations
	 and correlations often remain hidden in time-averaged studies. In this tal
	k\, I will discuss experiments that employ femtosecond mid-IR and X-ray pro
	bes to study intrinsic processes in correlated solids. In particular\, I wi
	ll focus on recent experiments that reveal ultrafast charge localization an
	d lattice coupling in the model stripe-phase nickelate La1.75Sr0.25NiO4\, a
	s dynamical precursors to stripe formation. The onset of electronic localiz
	ation is manifested in the opening of a pseudogap at a crossover temperatur
	e T* far above long-range stripe formation. Ultrafast excitation triggers a
	 sub-picosecond dynamics that exposes a strong and rapid dependence of Fano
	 electron-phonon coupling on the local charge arrangement. These results cl
	arify the role of charge localization in the nickelate pseudogap\, suggesti
	ng new ways to understanding this mysterious phase in a broader class of co
	mplex oxide materials.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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