34 lines
644 B
Gnuplot
34 lines
644 B
Gnuplot
# default output canvas size: 12.5cm x 8.75cm
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set term lua tikz size 8,6 standalone
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unset key
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unset xtics
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unset ytics
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unset ztics
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unset border
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unset colorbox
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set pointsize 1
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#set xrange [0:4*pi/3]
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#set yrange [-2*pi/sqrt(3):2*pi/sqrt(3)]
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set pm3d depthorder
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# make this odd and divisible by 7 to get the Fermi points
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set isosamples 49
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# rescale x and y components to render the Fermi points better
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# units of 2*pi/3
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set xrange [0:2]
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# units of 2*pi/(3*sqrt(3))
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set yrange [-3:3]
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set view 80,35
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splot sqrt(1+4*cos(pi*x)*cos(pi/3*y)+4*cos(pi/3*y)**2) w pm3d, -sqrt(1+4*cos(pi*x)*cos(pi/3*y)+4*cos(pi/3*y)**2) w pm3d
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#pause mouse close
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