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Temperature dependence of the excitonic transitions in GaAsGaAlAs superlattices under a weak electric field
Author(s) -
Depeyrot J.,
Tronc P.,
Umdenstock E.,
Palmier J. F.,
Etienne B.
Publication year - 1994
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.2221830211
Subject(s) - superlattice , exciton , electric field , condensed matter physics , thermal equilibrium , boltzmann distribution , boltzmann constant , field (mathematics) , thermal , physics , distribution function , materials science , quantum mechanics , thermodynamics , mathematics , pure mathematics
The temperature variations (between 9 and 80 K) of the ratio ϱ = I −1 / I 0 of the intensities of the −1 and 0 peaks of the Wannier‐Stark ladder in a GaAsGa 0.65 Al 0.35 As superlattice under an electric field are interpreted. The model is based on the thermal equilibrium between the two populations of excitons. The filling rate of every excitonic levels is given by the Maxwell‐Boltzmann distribution function. A discrepancy appears at low temperatures ( T < 50 K); the excitons are trapped into the direct state rather than in the crossed one, showing that the equilibrium statistics are not respected.