Parameter definitions for "ziman"
It's probably useful to look first at the special features page. You may also want to look at one of the general help files, Sliders, or
Graphs.
Inputs
- SLIDERS
- E_x: x-component of the applied DC electric field, in units of 10^6 Volts/meter.
- E_y: y-component of the applied DC electric field, in units of 10^6 Volts/meter.
- B_z: magnitude of the applied magnetic field, in units of tesla: the field is perpendicular to the plane of the screen (z-direction)
- k_x: x-component of the initial wave vector: more easily entered by a click at the appropriate point on the screen with the left mouse button.
- k_y: y-component of the initial wave vector: more easily entered by a click at the appropriate point on the screen with the left mouse button.
- anisotropy: anisotropy parameter, a measure of the relative strength of the k_y and k_x dependencies of the energy E(k). For details, see special features. (Unrestricted, but green contour lines show only for A > -1.)
- speed: varies the animation rate in the displays. The displays are updated every 0.3 x (speed) picoseconds of simulation time. The clock properly scales with the simulation whatever the speed setting. (Restricted to positive values.)
- MENUS
- zone scheme: allows the use, in the right hand display, of either of two zone schemes:
- reduced: electron wave vector is always reduced to the first Brillouin zone, -(pi/a) < k_x, k_y < (pi/a) by the addition of a suitable reciprocal lattice vector.
- repeated: electron is allowed to move continuously in k-space through the periodic extension of the E(k), originally defined in the first Brillouin zone, to all of k-space.
- TOGGLES
- run/stop: starts and stops the animation: key equivalent is the spacebar
- BUTTONS
- initialize: resets the wave vector to the initial value in the k_x, k_y sliders. Key equivalent is the i-key, or a single click (left button) on a desired initial k. Program can be initialized "on the fly" (without stopping).
- presets: Takes you to a tear-off menu with which you may select the presets. For more details, see the preset item in the miscellaneous help file.
- configure:
- real space range: in units of 10^-6 meters, adjusts the area of the real space display to the range -(real space range) < x, y < (real space range). (Restricted to positive values.)
- revert: updates the listed configure parameters to the current values (which may have been changed by a preset command).
- close: closes the configure window.
- help: Opens the help system which you have already found!
- quit: Terminates "ziman".
- KEY ACTIONS
- i-key: is equivalent to the initialize button and the single click (left button) on a desired initial k. The program may be initialized "on the fly" (without stopping).
- e-key: with no panel equivalent, erases the trajectory up to the current time but does not initialize the program or reset the clock.
Outputs
- DISPLAYS
- left side: shows the real space trajectory of the electron. The display may be changed in size with the real space range in the configure dialog.
- right side: shows the k-space trajectory of the electron. The green lines are constant energy contours for the dispersion relation E(k) given in special features.
- READOUTS
- time: reads simulation time, in picoseconds, independent of the choice of the speed parameter. The clock starts at the most recent initialization.
- cursor position: below the real space display it is given in units of 10^-6 meters, and below the k-space display it is given in units of (pi/a).