Square well lines potential
The square well lines (SWL) potential is given by [1] Eq. 5:
- Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\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 }
where Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle H()} is the Heaviside step distribution.