Imaging potential energy landscapes with quantum dots

Electric and magnetic field control of InAs quantum dots has been leveraged for sensing in recent years. Self-assembled quantum dots have been used for charge sensing, magnetometry, and thermometry.\footnote{A. N. Vamivakas et. al., Phy. Rev. Lett., 107, 166802 (2011)}$^{,}$\footnote{F. Haupt et. al., Phy. Rev. Applied, 2, 024001 (2014)}$^{,}$\footnote{F. Seilmeier et. al. Phy. Rev. Applied, 2, 024002 (2014)} We extend this sensing platform to measuring potential landscapes in proximal metals using a charge-tunable quantum dot device architecture. The voltage profile is extracted by identifying variations in the charging plateau through non-resonant photoluminescence spectroscopy, and compared with finite element analysis simulations.