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.
Elliott, Intensity of optical absorption by excitons, Physical Review108, 1384 (1957)
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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.