Energy delta when 2 particles of coordinates \( (\vec{x}_1, \vec{\mu}_1) \) and \( (\vec{x}_2, \vec{\mu}_2) \) switch their positions. \[ \Delta U = 2 \sum_{\vec{k}} w_\alpha(\vec{k}) \vec{k}\cdot(\vec{\mu}_1 - \vec{\mu}_2) \left\{ \Re\left[ \left(e^{i\vec{k}\cdot\vec{x}_2} - e^{i\vec{k}\cdot\vec{x}_1} \right) S^\ast(\vec{k}) \right] + \vec{k}\cdot(\vec{\mu}_1 - \vec{\mu}_2) \left[ 1 - \Re\left( e^{i\vec{k}\cdot\vec{x}_1} e^{-i\vec{k}\cdot\vec{x}_2} \right) \right] \right\} \]
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| class(Abstract_DES_Reci_Visitor), | intent(in) | :: | this | |||
| integer, | intent(in) | :: | ij_components(:) | |||
| type(Concrete_Particle), | intent(in) | :: | particles(:) |
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