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SUMMARY:Probing molecular excitons with ultrafast nonlinear spectroscopy -
  Professor Jacob Krich\, University of Ottowa
DTSTART:20160517T133000Z
DTEND:20160517T143000Z
UID:TALK66072@talks.cam.ac.uk
CONTACT:Stuart Higgins
DESCRIPTION:When a molecule absorbs light\, it creates an exciton -- a cha
 rge-neutral excitation often described as the bound state of an electron a
 nd a hole. Efficient operation of photosynthesis and organic photovoltaics
  relies on the transport of excitons. Recent experiments have found eviden
 ce for long-lived quantum coherence in exciton transport in photosynthetic
  systems\, but the microscopic origin of these coherences is disputed. I w
 ill discuss a set of experimental methods to understand properties of exci
 ton dynamics\, including quantum process tomography (QPT) -- which can ful
 ly characterize exciton transport even in the presence of decoherence and 
 relaxation -- and a simpler pump-probe technique to separate electronic fr
 om vibrational effects. I will describe how to perform both types of exper
 iments on the single-exciton space of small organic systems using nonlinea
 r ultrafast spectroscopy. I will discuss the first experimental demonstrat
 ion of the QPT technique and ongoing work to realize the pump-probe techni
 que. 
LOCATION:Kapitza Building Seminar Room\, Cavendish Laboratory\, Department
  of Physics
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