Author Affiliations

Jie Gu,^1,2 Lutz Waldecker,³ Daniel Rhodes,⁴ Alexandra Boehmke,¹ Archana Raja,⁵ Rian Koots,¹ James C. Hone,⁴ Tony F. Heinz,³ and Vinod M. Menon^1,2,*

¹Department of Physics, City College of New York, 160 Convent Ave., New York, NY 10031, USA

²Department of Physics, Graduate Center of the City University of New York (CUNY), 365 Fifth Ave. New York, NY 10016, USA

³Department of Applied Physics, Stanford University, Stanford, California, 94305 USA

⁴Department of Mechanical Engineering, Columbia University, New York, NY 10027 USA

⁵Kavli Energy Nano Science Institute, University of California, Berkeley, California 94720 USA

^*Corresponding author: vmenon@ccny.cuny.edu