Non-Equilibrium Quantum Phenomena: Rydberg Bosons, Dirac Fermions and Beyond
| Date/Time: | Thursday, 13 Oct 2016 from 4:10 pm to 5:00 pm |
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| Location: | Physics 18/19 |
| Phone: | 515-294-7377 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
Abstract: The challenge to push the gigahertz switching speed-limit of today's electronic devices into the terahertz regime underlies the entire field of information processing, storage, communication as well as integrated multi-functional systems. One key fundamental issue is how photoexcitations evolve in time into Coulomb-bound, collective excitations and unbound charge carrier transport. Up to now, the initial quantum dynamics following photoexcitation remains inaccessible in many newly-discovered, exotic materials despite of their significant potential for photovoltaic, quantum and optoelectronic technologies. In this talk, I will discuss to implement an emerging theme: use ultrashort and low-energy laser pulses to both probe and control non-equilibrium quantum dynamics under salient conditions of femtosecond in time and milli-electron volts (terahertz) in energy. I will elaborate two recent examples in our program, from the quantum formation pathways of the birth of Rydberg bosons in the hybrid perovskites to control coherent Dirac fermion transport in topological insulators. Finally I will briefly discuss long-term vision and far-reaching consequence of this cross-cutting theme in future science and technology.
*Dr. Wang is a candidate for promotion from Associate Professor to Full Professor