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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260814T222143Z
LAST-MODIFIED:20150115T143759Z
DTSTART:20150116T170000Z
DTEND:20150116T180000Z
UID:event1386@bu.edu
URL:http://physics.bu.edu/internal/events/show/1386
SUMMARY:Surface Plasmons and Impurity States in Graphene
DESCRIPTION:Featuring Victor Brar\, California Institute of Technology\n\nP
	art of the Biophysics/Condensed Matter Seminar Series.\n\nAbstract:\nGraphe
	ne\, an atomically thin sheet of carbon atoms\, provides a unique platform 
	to study quasiparticle interactions and to create optical metamaterials wit
	h novel properties.  The 2D nature and linear band structure of graphene gi
	ve rise to a semi-metal behavior\, with tunable dielectric properties and a
	 high electron mobility.  In the DC regime\, these properties allow graphen
	e to display novel screening behavior in the presence of charged impurities
	\, which I will show can be probed directly using scanning tunneling spectr
	oscopy (STM).  At optical (mid-IR) frequencies\, the graphene dielectric fu
	nction is strongly perturbed by the presence of collective excitations know
	n as surface plasmon polaritons (SPPs)\, which are optical modes - supporte
	d by free carriers - that are bound to the graphene sheet.  These modes sho
	w a number of remarkable properties\, including a carrier density dependent
	 dispersion relation\, and wavelengths that are more than 100 times shorter
	 than freespace.  I will show how the surface plasmons in graphene can be h
	arnessed to create infrared metasurfaces that have tunable optical properti
	es.  These materials will be shown to exhibit extreme light-matter interact
	ions that can control the macroscopic absorption and emission properties of
	 nanostructured dielectric stacks.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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