Electrical measurement of quantum interference population control in (111) GaAs

Two-color quantum interference control is the interference between absorption pathways, such as one- and two-photon absorption. Depending on the symmetry of the crystal, it can result in a ballistic current being injected or modulation of the carrier population. Previously, population control has been measured using an all-optical technique. We present results of an experiment in which we measured the carrier population modulation electrically using a Au/Ge electrode structure patterned on (111) GaAs. This is a more practical technique for potential applications, such as carrier-envelope phase detection.\footnote{T. M. Fortier, P. A. Roos, D. J. Jones, S. T. Cundiff, R. D. R. Bhat and J. E. Sipe, Phys. Rev. Lett. 92, 147403 (2004)}