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Variational approach for phonon renormalization effects in photoexcited quantum wires and quantum wells
Author(s) -
Güven K.,
Tanatar B.
Publication year - 1996
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.2221970212
Subject(s) - polaron , physics , renormalization , quantum well , phonon , condensed matter physics , quantum , electron , random phase approximation , quantum electrodynamics , quantum mechanics , laser
We investigate the effects of screening on polaronic corrections to the effective band edge in photoexcited quasi‐one‐dimensional GaAs quantum wires and two‐dimensional quantum wells. We develop a variational method to calculate the polaron energy of a two‐component plasma (electrons and holes) coupled to LO‐phonons. Screening effects are incorporated within a dynamical scheme. We find that the screening effects and finite well width considerably reduce the polaron energy as the plasma density increases. Many‐body corrections beyond the random‐phase approximation are also considered.