Colloquium: Sumit Mazumdar

    Date: 
    Thursday, April 3, 2014 - 3:30pm - 5:00pm
    Location: 
    Meinel 307
    Description: 

    "Photophysics of Carbon-based Semiconductors and Carbon Nanostructures"

    Abstract(s): 

    Recent commercialization of flexible, variable-color organic light-emitting diodes based on carbon-based polymers and small molecules has demonstrated the technological impact, current and potential, of these materials. Tremendous progress has also been achieved using their applications as active layers of solar cells, field-effect transistors, photodetectors and optical modulators. Much of the fundamental science of these materials, however, remains still uncharted, in particular because carbon-based semiconductors are different from conventional semiconductors. The origin of this difference lies in the strong repulsive Coulomb interaction between the pi-electrons of carbon-based semiconductors and nanostructures. In this talk I will focus on experimental consequences of strong Coulomb interactions. Examples will be given based on recent experimental results involving single-walled carbon nanotubes, graphene nanofragments and multiple exciton generation in organic molecules. Consequences for device physics will be briefly discussed.

    Speaker Bio(s): 

    Sumit Mazumdar received his Ph.D. in chemistry in 1980 from Princeton University. He is a professor of physics, chemistry and optical sciences at the University of Arizona. He is a fellow of the American Physical Society and the 2006 recipient of the UA's Henry and Phyllis Koffler Prize for Research, Scholarship and Creative Activity. His research interests include theory of strongly correlated electrons, broken symmetry and superconductivity in narrow-band systems, photophysics of carbon-based semiconductors, and organic optoelectronic devices.