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DTSTART:20180325T030000
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DTSTAMP:20260424T151941Z
UID:5a0c1fc69d449503941809@ist.ac.at
DTSTART:20171127T113000
DTEND:20171127T123000
DESCRIPTION:Speaker: Justin Song\nhosted by Maksym Serbyn\nAbstract: The wi
 nding of Bloch wavefucntions in topological materials can produce a wealth
  of new phenomena. For example\, carriers in gapped two-dimensional Dirac 
 materials possess Berry curvature that enable Hall currents in the absence
  of an applied magnetic field. Another striking example are three-dimensio
 nal topological semimetals where the winding of Bloch wavefunctions produc
 es topological surface states that exhibit an unusual open surface Fermi a
 rcs.I will discuss new types of carrier dynamics that can emerge in Dirac/
 Weyl materials that reveal a new kind of opto-electronics. One salient exa
 mple is how photoresponse in GDMs with narrow bandgaps is enhanced by Berr
 y curvature. In these materials\, that include G/hBN\, or dual-gated Bilay
 er graphene\, even a small number of photoexcited carriers can carry large
  anomalous Hall currents - orders of magnitude larger than those previousl
 y observed in TMDs - enabling a new "Berry transport" regime to be accesse
 d. Another example is the unusual optical response of Fermi arc surface st
 ates. Hosted on particular surface terminations of topological semimetals\
 , I will discuss how Fermi arcs in Dirac and Weyl semimetals possess disti
 nctly anisotropic optical responses that are locked to the direction of th
 e crystal axes. These responses range from an unconventional and large lin
 ear dichroic behavior in the Fermi arcs of Dirac semimetals to a hyperboli
 c dispersions for the collective modes in Weyl semimetal surfaces\, and un
 derscore the essential role that Fermi arc surface states play in the opto
 -electronics of topological semimetals.1 Justin\, Song\, Institute of High
  Performance Computing\, A*STAR\, Singapore\, and2 Justin\, Song\, Divisio
 n of Physics and Applied Physics\, Nanyang Technological University\, Sing
 apore
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:sdanzing@ist.ac.at
SUMMARY:Justin Song: Opto-­electronics in topological materials
URL:https://talks-calendar.ista.ac.at/events/962
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