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Ultrafast optical measurements of spin polarization in semiconductors

November 9, 2015 - 11:00am
Speaker: 
Vanessa Sih
Institution: 
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 [1] and the modification of the electron spin precession frequency in a bulk semiconductor using an applied in-plane electric field [2].  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 [3].
[1] B. M. Norman et al., Phys. Rev. Lett 112, 056601 (2014)
[2] M. Luengo-Kovac et al., Phys. Rev. B 91, 201110(R) (2015)
[3] B. C. Pursley et al., arXiv:1508.07383.
2400 Computer and Space Sciences
College Park, MD 20742