1. K-State home
  2. »Physics
  3. »News & Events
  4. »Colloquia
  5. »Fall 2014
  6. »Hui Zhao

Department of Physics

Dr. Hui Zhao
University of Kansas
 
 Hui Zhao
 
Nonlinear optical studies of electronic transport in semiconductors
102 Cardwell Hall
October 27, 2014
4:30 p.m.

 

Electronic transport on nanometer dimensions is of fundamental importance in semiconductor nano-electronics. In this talk I will discuss our recent experimental studies of ballistic charge and spin transport on nanometer length scales by using ultrafast nonlinear optical techniques. I will discuss optical injection of ballistic currents through a coherent control technique utilizing quantum interference between one-photon and two-photon absorption pathways. I will then describe how to study the dynamics of these ballistic currents by tracking the position of the carriers with 100-femtosecond temporal resolution and sub-nanometer spatial detection capability. I will discuss second-order nonlinear optical effects induced by the spin and charge currents, and show that these effects can be used for a direct, nondestructive, and real-time imaging of these currents.

 

Hui Zhao is an Associate Professor in the Department of Physics and Astronomy at the University of Kansas.  
Email: huizhao@ku.edu; Web: http://ultrafast.ku.edu