Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 20: Postersitzung IV (Mesoskopische Systeme, Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen)
TT 20.8: Poster
Donnerstag, 27. März 2003, 14:30–19:00, P2c, P2d
Imaging of Transmission Paths through Open Quantum Dots by Scanning Fourier Spectroscopy — •Y.H. Kim1, H.-J. Stöckmann1, J.P. Bird2, U. Kuhl1, and M. Barth1 — 1AG Quantenchaos, Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg — 2Department of Electrical Engineering and Center for Solid State Electronics Research, Arizona State University, Tempe, AZ 85287-5706, USA
We study the influence of a movable scattering center on the transmission properties, and the wavefunction, of an open microwave cavity. The motivation for this study is provided, in part, by our recent observation that the transmission properties of such cavities are intimately correlated to the presence of recurring wavefunction scars [1], similar to the behavior found previously in open quantum dots [2]. In this Poster, we show that a movable scatterer may be used as a position-selective tool, to suppress the contribution of those wavefunction scars that exhibit an enhancement of their probability density close to where the impurity is located. By employing a technique which we refer to as scanning Fourier spectroscopy, we show how it is possible to image the electron trajectories that dominate the transport behavior, directly from the results of transmission measurements.
[1] Y.-H. Kim, M. Barth, H.-J. Stöckmann and J.P. Bird, Phys. Rev. B65, 165317 (2002)
[2] R. Akis, D. K. Ferry, and J.P. Bird, Phys. Rev. Lett.79, 123 (1997)