Affiliations

• ¹ Department of Physics, University of California, San Diego, CA, USA. Department of Physics, Columbia University, New York, NY, USA. db3056@columbia.edu.
• ² Department of Physics, University of California, San Diego, CA, USA.
• ³ Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain. Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain.