As quantum wells

X. Fu,1 Q. Shi,1,* M. A. Zudov,1,† G. C. Gardner,2,3 J. D. Watson,3,4,‡ and M. J. Manfra2,3,4,5 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA 2Microsoft Quantum Lab Purdue, Purdue University, West Lafayette, Indiana 47907, USA 3Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA 4Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA 5School of Electrical and Computer Engineering and School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA