35 lines
666 B
TeX
35 lines
666 B
TeX
\documentclass{standalone}
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\usepackage{tikz}
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\def\pole#1{
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\draw#1++(0.1,0.1)--++(-0.2,-0.2);
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\draw#1++(-0.1,0.1)--++(0.2,-0.2);
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\draw[color=red, line width=1pt]#1circle(0.3);
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}
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\begin{document}
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\begin{tikzpicture}
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% branch cut
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\fill[color=gray](-3.3,-0.1)--++(3.3,0)--++(0,0.2)--++(-3.3,0)--cycle;
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% axes
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\draw(-3.3,0)--++(6.6,0);
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\draw(0,-3.3)--++(0,6.6);
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% -ik0^2
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\pole{(0,-2)}
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% other poles
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\input{poles.tikz}
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% contour
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\draw[color=red, line width=1pt](-3.3,-0.3)--++(3.3,0);
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\draw[color=red, line width=1pt](0,-0.3)..controls(0.3,-0.3)and(0.3,0.3)..(0,0.3);
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\draw[color=red, line width=1pt](-3.3,0.3)--++(3.3,0);
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\end{tikzpicture}
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\end{document}
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