Author Affiliations

N.A. Fromer,^#,*** C. Schüller,^#,* D.S. Chemla,^# T.V. Shahbazyan,^#,** I.E. Perakis,^#,** K. Maranowski,^#,† and A.C. Gossan^#,†

^#Department of Physics, Univ. of California-Berkeley and Materials Sciences Division, Lawrence Berkeley Natl. Lab., Berkeley, CA 94720, USA

^**Department of Physícs and Astronomy, Vanderbilt University, Nashville, TN 37235, USA

^†Department of Electrical and Computer Engineering, Univ. of California-Santa Barbara, CA 93106, USA

^*On leave from Institut für Angewandte Physik and Zentrum für Mikrostrukturforschung, Jun- giusstr. 11, 20355 Hamburg, Germany.

^*** NAFromer@lbl.gov