Author Affiliations

M. Remeika,^a,* A. T. Hammack,^a S. Poltavtsev,^a,1 L. V. Butov,^a J. Wilkes,^b A. L. Ivanov,^b K. L. Campman,^c M. Hanson,^c and A. C. Gossard^c

^aDepartment of Physics, University of California at San Diego, La Jolla, CA 92093-0319, USA

^bDepartment of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom

^cMaterials Department, University of California at Santa Barbara, Santa Barbara, CA 93106-5050, USA

¹On leave from the Spin Optics Laboratory, St-Petersburg State University, St-Petersburg, Russia

^*Corresponding author: remeika@physics.ucsd.edu