BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260912T123444Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20120907T160000Z
DTEND:20120907T170000Z
UID:event936@bu.edu
URL:http://physics.bu.edu/internal/events/show/936
SUMMARY:Ultrafast Broadband Electrodynamics of Carbon Nanostructures: From 
	Inverted Dirac Fermions to Dark Excitons 
DESCRIPTION:Featuring Jigang Wang\, Iowa State University\nHosted by: Richa
	rd Averitt\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\nAb
	stract:\nThe dynamical and nonlinear properties of low-dimensional solids a
	re fundamental in materials physics yet transformative in photonic technolo
	gy today. Although there have been well-established static transport and li
	near optical properties in 2D graphenes and 1D carbon nanotubes\, nonlinear
	 transient phenomena and quantum processes at fs time scales have been much
	 less addressed. Particularly\, this field of research offers technological
	-relevant functions that are distinctly different from either bulk solids o
	r simple molecules\, e.g.\, dark states of 1D excitons and inverted Dirac f
	ermions. The recent development of ultrafast laser sources and spectroscopy
	 tools facilitates understanding these issues via resolving dynamic informa
	tion often hidden in stationary measurements. In this talk\, I will present
	 two examples of applying them in exploring carbon nanostructures: (1) demo
	nstration of stimulated near-infrared emission from population inversion of
	 Dirac fermions in graphene; (2) discovery of the dark excitonic ground sta
	tes in single-walled carbon nanotubes. Finally\, I will also discuss techno
	logical implications and some other opportunities in this highly interdisci
	plinary field of research\, which are enabled by the experimental concepts 
	and capabilities revealed.Brief biosketchJigang Wang is an assistant profes
	sor in the Department of Physics and Astronomy at Iowa State University and
	 staff scientist in Ames laboratory of US department of Energy. He is an ex
	pert in experimental condensed matter physics\, focusing on ultrafast laser
	 spectroscopy and femtosecond quantum phenomena in nanostructures and stron
	gly correlated electron materials. His current projects include ultrafast m
	agnetism in correlated electrons\, dynamics of iron pnictide superconductor
	s\, nonlinear optics in metamaterials\, ultrabroadband electrodynamics in c
	arbon nanotubes and graphenes. He is recipient of the NSF CAREER award. He 
	received his Ph.D. from Rice University and joined Lawrence Berkeley Nation
	al Laboratory as Physicist Postdoctoral Fellow.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR