Square well lines potential

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The square well lines (SWL) potential is given by [1] Eq. 5:

\Phi_{\mathrm{SWL}}(1,2) = \frac{\epsilon n^2}{L^2} \int_{-L/2}^{L/2}\int_{-L/2}^{L/2} \left[ H(s_2 - r(\lambda, \mu)) -H(s_1 -r(\lambda, \mu)) \right]~{\mathrm d}\mu~{\mathrm d}\lambda

where H() is the Heaviside step distribution.


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