Wave Function Mapping At Fano Resonances And Conductance Switching In Open Quantum Dots

We numerically simulate the effects of a controllable impurity induced by an atomic microscope tip scanned on an open quantum dot with highly transmitting channels. The coupled quantum dot - tip system may result in a transistor like device, for which the conductance switching is a function of the position, spatial dimensions and potential of the perturbation induced by the tip. For realistic dimensions we show that energy shifts of the resonances deliver a bona fide imaging of low energy isolated quantum dot states, as well as of higher energy states coupled to the continuum (Fano resonances). © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.2831293132Marzin, J.Y., Gerard, J.M., (1989) Phys. Rev. Lett., 62, p. 2172Topinka, M.A., LeRoy, B.J., Shaw, S.E.J., Heller, E.J., Westervelt, R.M., Maranowski, K.D., Gossard, A.C., (2000) Science, 289, p. 2323Lundberg, T., Frost, J.E.F., Berggren, K.F., Ji, Z.L., Liang, C.T., Castleton, I.M., Ritchie, D.A., Pepper, M., (1997) Semicond. Sci. Technol., 12, p. 875Mendoza, M., Schulz, P.A., (2003) Phys. Rev. B, 68, p. 205302Crook, R., Smith, C.G., Graham, A.C., Farrer, I., Beere, H.E., Ritchie, D.A., (2003) Phys. Rev. Lett., 91, p. 246803Datta, S., (2000) Superlattices Microstruc., 28, p. 253M. Mendoza and P. A. Schulz, unpublishedBaranger, H.U., Divicenzo, D.P., Jalabert, R.A., Stone, A.D., (1991) Phys. Rev. B, 44, p. 10637Takagaki, Y., Ploog, K.H., (2004) Phys. Rev. B, 70, p. 07330