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Polaronic Effects on Exciton States with Different Angular Momenta
Author(s) -
Iadonisi G.,
Bassani F.,
Strinati G.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221530219
Subject(s) - exciton , binding energy , bipolaron , polaron , ionic bonding , physics , ground state , atomic physics , polar , electron , condensed matter physics , basis (linear algebra) , phonon , biexciton , chemistry , quantum mechanics , ion , geometry , mathematics
It is shown that exciton states with various total angular momenta ( L = 0, 1, 2, 3) are differently affected by the interaction with LO phonons in polar materials. In particular, a dependence is found of the binding energy on the value of L not expected on the basis of the statically screened electron‐hole attraction. Calculations for CuCl and other ionic compounds show that the lowest L = 1 state ( n = 2) is less bound than the corresponding exciton state with static screening. This effect, which is opposite to the polaronic effect on the ground state, is still present for L ≧ 2 but it decreases with increasing L . The computed binding energies of 2p excitons compare favorably with the available experimental data. The method is also applied to the calculation of bipolaron binding energies.