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.
(S111) Here,π§=(π,K, π), ΛTis the time-ordering operator, andπ β1 Ξ¦ (π§, π§ β²)=π β1 Ξ¦;ππ β² (K)πΏ KK β² πΏ(πβπ β²)
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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.