1au=5.2917·10-11m; unit of Fermi velocity: 2.188·106m/s
© C. Lehmann, S. Sinning, P. Zahn, H. Wonn, I. Mertig, Dresden 1996-1998
Another option is the Fermi velocity of the electrons. The velocity at the Fermi surface is indicated by continuously changing colors from low velocity states (blue) to high velocity states (red).
Finally, the character of the electronic states is analyzed. For this purpose an angular momentum expansion of the Bloch functions is used. The square of the expansion coefficients is a measure for the character of the states. For zero expansion coefficients (blue) the considered angular momentum component is absent. For expansion coefficients equal to one (yellow) the considered character dominates. In between is a continuous transition.
An easy introduction to the figures is given in . Numerical details of the visualization are discussed in .
 H. Eschrig, Optimized LCAO Method and the Electronic Structure of
Extended Systems, Akademie-Verlag Berlin (1988)
 M. Richter and H. Eschrig, Solid State Communications 72, 263 (1989)
 C. Lehmann, Staatsexamensarbeit, TU Dresden (1997) (in German)
 P. Zahn, Diplomarbeit, TU Dresden (1994) (in German)
This work was done at the Institut für Theoretische Physik at the TU Dresden.
J. Bergmann († 09 Sept 2010),
last modified Nov 7 2001 (rev. 01 Dec 2011)
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