Title: Use of Ultrafast Techniques in Studies of Charge Density Wave Systems
Speaker: Dr. Goran Karapetrov, Department of Materials Science and Engineering, Drexel University
Time: April 19, 2021 03:00 PM Eastern Time (US and Canada)
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https://gmu.zoom.us/j/96920316926?pwd=SjZybGp1N2c2QjBsWFVXcVpOMFc0dz09
Abstract: Studies of correlated electron systems are often focused on the complex interaction of charge, spin, orbital and lattice degrees of freedom. Ultrafast spectroscopies have been primary tools in experimental investigation of the dynamics of complex orders by exciting the system out of equilibrium using the pump pulse and applying variety of probes to see the response. The probing of the excited system can be achieved using optical, electronic and x-ray beams and different techniques provide pieces of the puzzle that one should carefully assemble. On the examples of few dichalcogenide CDW/superconducting materials such as NbSe2 and TiSe2 we will discuss the current understanding of the mechanism of the correlated electronic states and how this knowledge could be applied to more complex materials.
Bio:
Dr. Goran Karapetrov is a member of the faculty at the Department of Physics, Drexel University since 2011. Before joining Drexel, he was a staff member at the Materials Science Division at Argonne National Laboratory working on mesoscopic superconductivity and scanning tunneling microscopy and spectroscopy of superconductors. Dr Karapetrov obtained his diploma from the Department of Low Temperature Physics, Moscow State University, and PhD degree in Physics from Oregon State University.
Dr. Karapetrov’s research focuses on the physics of correlated electron systems such as charge density wave materials and superconductors. In his laboratory at Drexel, he uses both high spatial resolution probes (UHV STM, AFM) and high temporal resolution probes (ultrafast electron diffraction) to study local properties and dynamics of these systems.