Chih-Yung Chen, PhD, studies deep states responsible for the persistent photoconductivity in quantum well structures of Si-doped GaAs, an area of great technological interest because of its potential applications in high-density data storage.
Chen’s lab performed the experiment of Shubnikov-deHaas oscillations in magnetoresistance (MR) on a series of delta- GaAs:Si QW structures. From the Shubnikov-deHaas oscillations the subband structure of the two-dimensional electron gas confined in the well can be determined. Its temperature dependence will provide important information about the height of the recapture barrier that prevents the electrons from recombining with defects and results in persistent photoconductivity.
Recently, Chen joined with Harvey Mudd professors James Eckert and Patricia Sparks to study materials with large magnetoresistance.
- Harvey Mudd Magazine, Fall/Winter 2017 A Quantum Career