(Physicist, MBA)

## Electron interference effects in HgCdTe

Quantum effects in the narrow gap semiconductor Hg$$_{0.8}Cd$$_{0.2}Te 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