Hybrid Quantum Dot-2D Electron Gas Devices for Coherent Optoelectronics
  We present an inverted GaAs 2D electron gas with self-assembled InAs quantum dots in close proximity, with the goal of combining quantum transport with quantum optics experiments. We have grown and characterized several wafers -- using transport, AFM and optics -- finding narrow-linewidth optical dots and high-mobility, single subband 2D gases. Despite being buried 500 nm below the surface, the dots are clearly visible on AFM scans, allowing precise localization and paving the way towards a hybrid quantum system integrating optical dots with surface gate-defined nanostructures in the 2D gas. 
F. Dettwiler, P. Fallahi, D. Scholz, E. Reiger, D. Schuh, A. Badolato,   W. Wegscheider, and D. M. Zumb\"uhl
cond-mat.mes-hall