Author Affiliations

Q. Zhong,^1,2 H. Zhao,³ L. Feng,⁴ K. Busch,^5,6 S.K. Ozdemir,⁷ and R. El-Ganainy^1,2

¹Department of Physics, Michigan Technological University, Houghton, MI 49931, USA

²Henes Center for Quantum Phenomena, Michigan Technological University, Houghton, MI 49931, USA

³Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA

⁴Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA

⁵Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik & Photonik, 12489 Berlin, Germany

⁶Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin, Germany

⁷Department of Engineering Science and Mechanics, and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA