October 21, 2019 @ 11:00 am – 12:00 pm

“Interaction-Driven Phase Transitions in Symmetry Broken CDW Systems Studied by Ultrafast Electron Diffraction”, Faran Zhou, Michigan State University, Monday, October 21, Bldg 432, Conference Room

Spontaneous symmetry breaking process results in the formation of broken-symmetry states like superconductivity, ferromagnetism and charge-density wave. This broken-symmetry state is usually energetically preferred ground state of matter at low temperatures. With a femtosecond laser pulse excitation, a natural result is the excitation of electrons and subsequent lattice heating, which would suppress the ordered broken-symmetry states. For example, it’s common to observe the ultrafast melting of a ferromagnetic order or charge density wave, but very rare to see the other way around — light induced new symmetry broken states like superconductivity. In this talk, I’ll present a case where we observed light induced CDW in CeTe3.