A variational approach produces a nonlocal spin-dependent effective potential between two ground-state Wannier excitons that reduces to the local Heitler-London hydrogen result for heavy holes and yields van der Waals interactions when excited states are included.
(S53) Additionally, the whole expression is multiplied by the momentum and frequency conservation deltas,πΏ K1+K2,K β² 1+Kβ² 2 and πΏπ1+π2,πβ² 1+πβ² 2, respectively
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Variational and field-theoretical approach to exciton-exciton interactions and biexcitons in semiconductors
A variational approach produces a nonlocal spin-dependent effective potential between two ground-state Wannier excitons that reduces to the local Heitler-London hydrogen result for heavy holes and yields van der Waals interactions when excited states are included.