Ultrafast Dynamics in Complex Materials

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Date/Time:Monday, 27 Sep 2010 from 4:10 pm to 5:10 pm
Location:Physics, Room 5
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Toni Taylor (Los Alamos National Laboratory)

I will discuss the development and application of novel optical spectroscopic techniques to the study of ultrafast dynamics in complex materials. I will first describe all-optical pump probe and optical-pump far-infrared probe experiments for the investigation of correlated electron materials such as heavy fermions, superconductors, magnetic materials and graphene. The experimental techniques are discussed followed by a brief review of ultrafast electron dynamics in conventional wide band metals that serves as a starting point in understanding dynamics in more complex systems. Our results show that, in general, ultrafast optical spectroscopy provides a sensitive method to probe the dynamics of quasiparticles at the Fermi level. We have further extended these measurements to reveal dynamics in structured materials such as metamaterials where the materials are designed to control the electromagnetic interactions.