sw_plotspec

Syntax

[fhandle, phandle] = sw_plotspec(spectra,Name,Value)

Description

[fhandle, phandle] = sw_plotspec(spectra,Name,Value) plots excitation spectrum that is calculated either by spinw.spinwave or spinw.powspec. It can plot dispersion or intensities as line plots or the energy binned spectrum as a color plot. The color plots uses [cm_inferno] as a default colormap. To change the default colormap use the swpref.setpref('colormap',@my_colomap) command. The function is able to plot the spectrum if it is calculated along a path in the Brillouin-zone and display the labels of the high symmetry Brillouon-zone points.

Name-Value Pair Arguments

'mode'

Choose the type of plot using the following strings:

• 'disp' Plot dispersion as line plot.
• 'int' PLot intensity of each mode as line plot.
• 'color' Color plot of energy binned spectrum.
• 'auto' Auto plot mode that tries to determine the best parameteres, default.

'imag'

If true also the imaginary part of the dispersion and the correlation function values will be shown as red lines on top the real values. For color plot if true only the imaginary part of the binned data will be shown. Default value is false.

'aHandle'

Handle of the axis object which will show the plot. If undefined the active axis will be used, see [gca].

'colorbar'

Plot colorbar for dispersion and intensity, default value is true.

'nCol'

Number of colors in the colormap, default value is 500.

'dashed'

If true dashed vertical lines between linear $Q$ segments will be shown. Default is false.

'dE'

If given, a Gaussian will be convoluted with the binned data to simulate finite energy resolution. Only works if mode=3. If zero, no convolution performed. Default value is 0.

'fontSize'

Font size in pt for the labels on the plot, default value is 14 pt.

'colormap'

Colormap for plotting, default value is stored in swpref.getpref('colormap'). For single plot and for multiple plot it will be a continuous scale from white to different color. This is the 'auto' mode. Also colormap can be given directly using standard colormaps as function handles, e.g. @jet. To overplot multiple spectra colormap option will be a matrix, with dimensions [3 nConv], where every column defines a color for the maximum intensity. It is also used for plotting dispersion curves. In case a single color all dispersion curves have the same color (e.g. [255 0 0] for red), or as many colors as dispersion curves in a matrix with dimensions of $[3\times n_{mode}]$ or as a colormap function handle. In this case every mode will have different color and the color is determined from the index of the mode after the colormap is applied. Default value is 'auto'.

'sortMode'

Sorting the modes before plotting. Default is false. Can improve the quality of the dispersion line plots if modes are crossing.

'axLim'

Upper limit for energy axis (for mode 1,2) or color axis (for mode 3), default value is 'auto'. For color plot of multiple spectra the color axis cannot be changed after the plot.

'legend'

Whether to plot legend for multiple convoluted spectras, default value is true.

'title'

If true a title will be added to the figure, default value is true.

'twin'

Select which twins to be plotted for dispersion plots, by default the spectrum corresponding to all twins will be plotted. The dimensions are $[1\times n_{twinToPlot}]$.

'lineStyle'

Line style for line plots (dispersion and intensity), default value {'-' 'o-' '--'} for plotting modes that correspond to line style of $S(Q,\omega)$, $S(Q+k,\omega)$ and $S(Q-k,\omega)$ cross modes in case of incommensurate magnetic systems. For commensurate systems only thte first string in the cell will be considered. For example ‘–’ gives dashed lines.

'lineWidth'

Line width of line plots, default value is 0.5 pt.

'log'

If true, the 10-based logarithmic intensity will be plotted, default value is false.

'plotf'

Function handle of the plot function for color plot. Default is surf.

'maxPatch'

Maximum number of pixels that can be plotted using the [patch] function within [sw_surf]. Using [patch] for color plot can be slow on older machines, but the figure can be exported afterwards as a vector graphics, using the [print] function. Default value is 1000.

'norm'

If true, the convolution with a Gaussian function (in case of non-zero dE parameter) keeps the energy integrated intensity. If false the amplitude is kept constant. Default is determined by the value stored in the input spectra.norm.

'x0'

Row vector with two numbers [x0_min x0_max]. By default the $x$ range of the plot is [0 1] irrespective of the values of the $Q$ values. To change this the lower and upper limits can be given here.

'qlabel'

Provide a list of strings for the special $Q$ points along the path in the Brillouin zone, e.g. {'X' '\Gamma' 'M' 'K' '\Gamma'}.

'dat'

Experimental data points to plot over the calculated spectrum. Can be either the name of a data file that contains the experimentally fitted dispersion (needs to have the same format as the input file of spinw.fitspec see help for details on the file format), or it is a structure that contains the already imported data using the sw_readtable function, e.g.

T = sw_readtable('myExpData.txt','\t');
sw_plotspec(spectra,'dat',T);

'ddat'

Maximum distance between any $Q$ point in the simulated spectrum and an experimental data point in Å$^{-1}$ unit. If an experimental data point is further from any $Q$ point than the given limit, it will be omitted. Default value is 0.01.

Output Arguments

fHandle

Handle of the plot figure.

pHandle

Vector that contains the handle of the graphics objects on the figure.

See Also

spinw.plot | spinw.spinwave | [sw_surf] | [sw_label]