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Corrections to the W ANNIER ‐Exciton: Second Order Electron‐Hole Interaction
Author(s) -
Demuth M.
Publication year - 1973
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19734850305
Subject(s) - physics , electron , exciton , binding energy , quadratic equation , quantum mechanics , polarization (electrochemistry) , order (exchange) , quantum electrodynamics , condensed matter physics , chemistry , mathematics , geometry , finance , economics
The problem of the optical binding energy of the excition is considered in terms of the many particle theory for the crystal electrons. The kernel of the Bethe‐Salpeter‐Equation for the polarization function is approximated to second order in the screened C OULOMB potential V s . The quadratic terms are studied in order to obtain corrections of the optical binding energy of an exciton. These corrections are discussed and compared with other modifications of the linear V s ‐approximation and with experimental results.