Author Affiliations

Christine Y. Wang,^1,* L. Kuznetsova,² L. Diehl,² F. Kärtner,³ M. A. Belkin,² H. Schneider,⁴ H. C. Liu,⁵ and Federico Capasso²

¹Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

²School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA

³Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

⁴Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden-Rossendorf, 01314 Dresden, Germany

⁵Institute for Microstructural Sciences, National Research Council, Ottawa K1A 0R6, Ontario, Canada

^*Corresponding author: wang@fas.harvard.edu