Ultrafast optical measurements of spin polarization in semiconductors
University of Michigan
We are interested in understanding mechanisms that generate and manipulate electron spin polarization in non-magnetic materials using applied electric fields. In this talk, I will describe optical techniques that can measure the magnitude and direction of spin-orbit fields and electrically-generated spin polarization in non-magnetic semiconductors  and the modification of the electron spin precession frequency in a bulk semiconductor using an applied in-plane electric field . These techniques can sensitively measure and distinguish changes in the electron g-factor from changes in the effective magnetic fields produced by spin-orbit splitting and nuclear spin polarization. I will also discuss our recent development of resonant and time-resolved spin noise spectroscopy, which uses a train of short laser pulses to measure the spin correlation function with a temporal resolution that is limited by the optical pulse duration .
 B. M. Norman et al., Phys. Rev. Lett 112, 056601 (2014)
 M. Luengo-Kovac et al., Phys. Rev. B 91, 201110(R) (2015)
 B. C. Pursley et al., arXiv:1508.07383.
2400 Computer and Space Sciences
College Park, MD 20742