Jim Cao (Extra SIMES Seminar)

Date(s) - Nov 20 2014
3:00 PM - 4:00 PM

Whitney Room, room 310, Bldg. 40


Ultrafast probe using femtosecond electron pulses

Jim Cao

Physics Department and National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32310

In recent years, femtosecond electron pulses have emerged as a powerful tool to probe ultrafast dynamics in matter. They have been used in ultrafast diffraction to reveal the atomic-detail structural dynamics in real time, with a wide range of applications such as monitoring phase transitions in physics and materials science, and examining dynamics of reactions in chemistry and biology. They have also been used in ultrafast electron shadow imaging and deflection measurement to monitor the transient electron field and plasma dynamics. In this talk, I will focus on the development of ultrafast electron probe and its application in our research group. The topics will cover the mechanism of coherent phonon generation, ultrafast photo-induced demagnetization in ferromagnetic materials, photo-induced phase transition in correlated electron materials and the dynamics of warm dense matter.