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Dynamical screening and self‐energy of excitons in the electron–hole plasma
Author(s) -
Zimmermann R.,
Kilimann K.,
Kraeft W. D.,
Kremp D.,
Röpke G.
Publication year - 1978
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.2220900119
Subject(s) - exciton , physics , plasma , electron , atomic physics , biexciton , bound state , condensed matter physics , quantum mechanics
The dependence of two‐particle energies on plasma density is investigated using Green's functions. An effective exciton equation is derived taking into account dynamically screened potential and one‐particle self‐energies. A variational calculation shows that the bound state levels (exciton energies) remain practically constant whereas the continuum edge (band gap) shifts to lower energies with increasing density, which is in accordance with experimental observations.