Author Affiliations

L.J. Sham,¹ Pochung Chen,² C. Piermarocchi,³ and D.G. Steel⁴

¹Department of Physics, University of California San Diego, La Jolla, CA 92093-0319

²Department of Chemistry, University of California Berkeley, CA 94720-1460

³Department of Physics, Michigan State University, East Lansing, MI 48824-2320

⁴Department of Physics, University of Michigan, Ann Arbor, MI 48109

Phone: 858 534-3269, Fax: 858 534-2232, Phone: 510 643-4304, Fax: 510 643-0003, Phone:517 355-9200 X 2231, Fax: 517 353-4500, Phone: 734 764-4469, Fax: 734 763-9694