Quantum effects in the narrow gap semiconductor HgCdTe
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
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