Quantum- and electron interference effects

  • Electron interference effects in HgCdTe
  • Cut-Off-Wavelength detector (COW detektor)

  • Electron interference effects in HgCdTe

    Quantum effects in the narrow gap semiconductor Hg0.8Cd0.2Te are one research theme in the group of Prof. Dr. G. Nimtz at the II. Physical Institute of the University of Cologne. Nonclassical conductivity due to electron-electron-interactions in disordered systems (EEW) were measured in HgCdTe at temperatures below 30 K. A double dimension crossover from three-dimensional over two-dimensional to one-dimensional behaviour of the nonclassical conductivity contributions could be observed in a few micrometer large HgCdTe-samples.

    -Double Dimensional Crossovers of Nonclassical Conductivity, Huang et al., Phys. Rev. Lett. 67, 2705, 1991
    -Elektroneninterferenzeffekte und Energierelaxation in HgCdTe, J. Jakumeit, Doktorarbeit an der Universität Köln, Shaker Verlag Aachen, (1994)

  • Cut-Off-Wavelength detector (COW detector)

    The COW detector uses the fact that electrons can pass the one-dimensional channel of a point contact only if the wavelength of the electron becomes smaller than the dimension of the channel. Light absorbtion by electrons decreases the wavelength and leads therefore to a higher current through the point contact. This new detector principle was investigated theoretically and numerically.

    -Electron wave interference effects in CMT and quantum-size devices,G. Nimtz, J. X. Huang, J. Lange, L. Mester, H. Spieker, Semicond. Sci. Technol. 6 (1991), C130
    jakumeit@access.rwth-aachen.de
    Last modified: Mon Sep 17 17:39:29 CEST 2001