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First‐Order Mott Transition of the Exciton Gas in GaP
Author(s) -
Maaref H.,
Barrau J.,
Brousseau M.,
Collet J.,
Mazzaschi J.,
Pugnet M.
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.2220880129
Subject(s) - exciton , mott insulator , mott transition , condensed matter physics , phase transition , conductor , excitation , metal–insulator transition , materials science , luminescence , band gap , physics , hubbard model , quantum mechanics , optoelectronics , superconductivity , metallurgy , composite material , metal
The high‐density electron‐hole system in GaP is investigated. The luminescence spectra are discussed as function of the excitation level and temperature. The Mott transition of the exciton gas is observed and the conditions are found for the separation into two phases between 40 and 70 K. A low‐density phase is an insulator: a high‐density phase ( n p = 5 × 10 18 cm −3 ) is a conductor.