Author Affiliations

E. V. Calman,^1,* L. H. Fowler-Gerace,^1,*,** L. V. Butov,¹ D. E. Nikonov,² I. A. Young,² S. Hu,³ A. Mishchenko,³ and A. K. Geim³

¹Department of Physics, University of California at San Diego, La Jolla, CA 92093, USA

²Components Research, Intel Corporation, Hillsboro, OR 97124, USA

³School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK

^*equal contribution

^** lefowler@eng.ucsd.edu