Colloquium: Arvinder Singh Sandhu

    Date: 
    Thursday, September 25, 2014 - 3:30pm - 5:00pm
    Location: 
    Meinel 307
    Description: 

    "Attosecond Spectroscopy of Complex Systems"

    Abstract(s): 

    The advent of attosecond spectroscopy has led to exciting developments in ultrafast science. The unprecedented temporal resolution inherent in this technique has resulted in direct measurement and control of electronic processes on the natural timescale of electrons. The aim of ongoing research is to establish attosecond spectroscopy as an interdisciplinary technique with broad applicability in physics, chemistry and material sciences. My group has made important contributions in extending attosecond spectroscopy into the study of correlated dynamics in molecules and materials. I will present our latest results on the coherent evolution of electron hole near a conical intersection of a polyatomic molecule. Such conical intersections serve as nature’s energy funnels, and the associated charge dynamics are at the heart of many chemical and biochemical processes (e.g., hole migration in peptides, repair of DNA, light-harvesting, etc.). In a similar context, electron-phonon coupling in carbon nanomaterials (e.g., graphene) will also be discussed. I will show that, apart from the sensitive measurements of electron-nuclear or electron-phonon couplings, we can also monitor the evolution of quantum coherence during complex charge transfer dynamics.

    Speaker Bio(s): 

    Arvinder Singh Sandhu is an associate professor in the department of physics and the College of Optical Sciences at the University of Arizona. He obtained a Ph.D. in physics from Tata Institute of Fundamental Research in Mumbai, India, and a M.Sc. in physics from the Indian Institute of Technology in Kanpur, India. Sandhu worked as research associate at JILA at the University of Colorado, Boulder, from 2004 to 2007 before joining the University of Arizona faculty in 2007.

    Sandhu is the recipient of a 2010 CAREER Award from the National Science Foundation, a 2010 Excellence in Undergraduate Physics Teaching Award from the University of Arizona Department of Physics and the 2007 Young Scientist Medal from the Indian National Science Academy in New Delhi, India.

    Sandhu’s research interests are in attosecond and femtosecond spectroscopy, including the topics of electron dynamics in atoms and molecules, strong-field physics, non-adiabatic chemical dynamics, ultrafast processes in nanomaterials, intense laser-plasma physics and nonlinear spectroscopies.