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BEGIN:VEVENT
DTSTAMP:20260915T200532Z
LAST-MODIFIED:20140826T145914Z
DTSTART:20140903T130000Z
DTEND:20140903T140000Z
UID:event1323@bu.edu
URL:http://physics.bu.edu/internal/events/show/1323
SUMMARY:Transport in Dirac materials exposed to strong electromagnetic radi
	ation
DESCRIPTION:Featuring Dr. Sergey Syzranov\, University of Colorado\, Boulde
	r\nHosted by: Anatoli Polkovnikov\n\nPart of the Condensed Matter Theory Se
	minar Series.\n\nAbstract:\nWe study transport in materials with Dirac quas
	iparticle dispersion (such as graphene\, Weyl semimetal\, the surface of a 
	3D topological insulator) in the presence of linearly-polarised electromagn
	etic radiation of very large intensity. We demonstrate that low-energy dyna
	mics in such materials can be described by an effective time-independent Ha
	miltonian\, characterised by multiple Dirac points in the first Brillouin z
	one. Around each Dirac point the spectrum is anisotropic: the velocity alon
	g the polarisation of the radiation significantly exceeds the velocity in t
	he perpendicular direction. Moreover\, at some Dirac points the transverse 
	velocity oscillates as a function of the radiation intensity. These feature
	s of the spectrum manifest themselves in transport phenomena in the presenc
	e of a strong electromagnetic radiation. For instance\, the conductance of 
	a graphene p-n junction in the regime of strong irradiation depends on the 
	polarisation as $G(\theta)\propto|\sin\theta|^{3/2}$\, where $\theta$ is th
	e angle between the polarisation and the p-n interface\, and oscillates as 
	a function of the radiation intensity.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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