Speakers

Speakers

skip to events

calendar tabs

  •  All 
  • Grid
  • Month
  • Week
  • Day
  • (Selected tab) Detail

Event Detail Information

Event Detail Information

Condensed Matter Seminar: “Coupled spin-charge dynamics in semiconductors: from Coulomb drag to spin Hall effect”

Speaker

Giovanni Vignale, Department of Physics, University of Missouri-Columbia

Date Dec 6, 2013
Time 1:00 pm  
Location

190 Engineering Sciences Bldg - corner Goodwin & Springfield

 

Sponsor Physics
Contact Jason Maldonado
Phone 217.300.6431
Event type CM Seminar
Views 7352
Originating Calendar Physics - Condensed Matter Seminar

The recently acquired capability to excite transient spin and electron-hole density gratings in semiconductors quantum wells and monitor their evolution in real time opens new avenues to the study of coupled spin-charge dynamics of electrons in semiconductors.

In this talk I describe some of the physical effects that have been recently observed by this technique: the spin Coulomb drag, the electron-hole Coulomb drag, and the anomalous drift and diffusion caused by spin-orbit interactions. I then discuss a recent theoretical prediction that an electric field  parallel to the wavefronts of an electron-hole grating in a GaAs quantum well generates, via the electronic spin Hall effect, a spin grating.  A detailed study of the coupled spin-charge dynamics for quantum wells grown in different directions reveals rich features, including the possibility of generating a helical spin grating from a density grating.