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Possibility of the Excitonic Phase in Insulators
Author(s) -
Zimmermann R.
Publication year - 1970
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.19700390111
Subject(s) - excitation , exciton , insulator (electricity) , condensed matter physics , band gap , phase (matter) , physics , energy (signal processing) , quantum mechanics , optoelectronics
Applying many‐particle methods the lowest excitation energy of the exciton is calculated for an insulator with small energy gap. Screening is taken into account by means of a self‐consistent k ‐dependent screening function. At the finite critical gap G c the excitation energy vanishes leading to the excitonic phase.