Imaging of light induced carrier transport
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Imaging of carrier transport is possible due to contactless carrier
excitation by means of a small light spot or an electron beam. Besides of
electronic transport these techniques allow in addition to investigate other
material properties. This is due to the photo-thermoelectric excitation
mechanism by illumination and heating. This allows not only the
investigation of (thermo-) electric transport but also the imaging of
phonon, heat and photo-electric transport. The particles can be
distinguished by their reaction upon the application of a magnetic field and
by different detection mechanisms.
Different kinds of materials have been investigated in different crystal
orientations and magnetic field geometries: Such are different types of
metals including superconductors, semiconductors in two-dimensional and
three-dimensional geometry, intercrystalline boundaries and multi-layer
systems. This led to the observation of several new phenomena. Such are
Light Induced Electron Focusing (LIEF) at zero magnetic field, Light Induced
Transverse Electron Focusing (LITEF), Light Induced Longitudinal Electron
Focusing (LILEF), Electron Beam- Induced Electron Focusing (EBIEF),
Light Induced Sondheimer Oscillations (LISO), Light Induced Gurevich
Oscillations (LIGO), Light Induced Magneto-quantum Oscillations (LIMO) and
Light-induces Shubnikov-de Haas oscillations (LISHO). A lot of features have
been simulated numerically and the theoretical work mostly allowed to
reproduce the experimental data.
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BÖHM, Andreas, 1999. Imaging of light induced carrier transport [Dissertation]. Konstanz: University of KonstanzBibTex
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