Square well lines potential
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The square well lines (SWL) potential is given by [1] Eq. 5:
![{\displaystyle \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 }](https://wikimedia.org/api/rest_v1/media/math/render/svg/726887e0229ddb15dbaee2fb1b061e507de00da4)
where is the Heaviside step distribution.
