College of Science

SEMINAR: Ryan Smith [Lawrence Berkeley Laboratory]

Fast and Small: Ultrafast Spectroscopies of Nanoscale Materials

Apr 18, 2014 3:50 PM to Apr 18, 2014 5:00 PM at Building 4, Room 1-314

Ryan SmithAs the size of solid state devices trends toward the single-atom limit, quantum confinement gives rise to many exciting challenges that arise at the intersection of solid state electronics and modern optics. Short pulses of laser light (shorter than 10-12 seconds) are ideally suited for studying and controlling processes in low-dimensional materials. I will discuss my work using optical techniques in infrared pump-probe and THz time-domain spectroscopy revealing ultrafast carrier dynamics in materials such as semiconductor quantum wells, quantum dots, and graphene. Within these different systems, we will explore themes of fundamental processes such as electron-hole pair excitation, carrier transport, recombination, and Coulomb-induced nonlinearities, and will relate these processes to applications such as photovoltaic energy and nanoscale devices.

Dr. Ryan Smith is a postdoctoral researcher in the Materials Sciences Division at Lawrence Berkeley National Laboratory. He uses short-pulsed lasers to study extremely fast fundamental processes in solid state nanomaterials, leading to the development of technologies such as solar cells and high-performance computation.

3:50 p.m. Refreshments
4:00 p.m. Seminar