Special features of "ziman"
You may also want to look at the full parameter list of all the buttons and sliders, or at one of the general help files, Sliders, or
Graphs.
THE ENERGY BAND
- The dispersion relation used by "ziman" is
E(k) = (h-bar^2)/(2*m){(k_x)^2[1 - (1/2)(k_x*a/pi)^2] + A*(k_y)^2[1 -
(1/2)(k_y*a/pi)^2]},
and numerical values are appropriate to a lattice constant a=2 angstroms.
- A is the anisotropy parameter. It happens to give the ratio of the xx- to the yy-components of the effective mass at k = 0. The program will accept negative values, though the green contour lines will show only for A > -1.
- The green lines in the right-hand display are equally spaced energy contours, and the violet lines the boundaries of the first Brillouin zone
KEY EQUIVALENTS AND OTHER SHORTCUTS
- run/stop: key equivalent is the spacebar
- initialize: the i-key
- you can destroy the past trajectory, without initializing, with the e-key.
- instead of using the sliders, use a click with the left mouse button to place the electron at the cursor position in reciprocal space.
WARNING
Do not change presets with the program running: "ziman" tends not to feel well after such treatment.