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.
(S92) We will define the term in the curly brackets as W0 cv (𝑧 1, 𝑧2;𝑧 ′ 1, 𝑧′
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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.