Author Affiliations

Darren Valovcin,^*,1,2 Qile Wu,^3,4 Shawn Mack,⁵ Art C. Gossard,⁶ Ren-Bao Liu,³ and Mark S. Sherwin^1,2

¹Physics Department, University of California, Santa Barbara, USA

²Institute for Terahertz Science and Technology, University of California, Santa Barbara, USA

³Department of Physics, The Chinese University of Hong Kong, Hong Kong, China

⁴Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China

⁵U.S. Naval Research Laboratory, Washington, D.C., USA

⁶Materials Department, University of California, Santa Barbara, USA

^*Corresponding author: valovcin@phyiscs.ucsb.edu