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Evidence of two disorder scales in Ga(AsBi)

: Imhof, S.; Wagner, C.; Chernikov, A.; Koch, M.; Kolata, K.; Köster, N.S.; Chatterjee, S.; Koch, S.W.; Lu, X.; Johnson, S.R.; Beaton, D.A.; Tiedje, T.; Rubel, O.; Thränhardt, A.


Physica status solidi. B 248 (2011), No.4, pp.851-854
ISSN: 0031-8957
ISSN: 0370-1972
Journal Article
Fraunhofer ENAS ()

Temperature-dependent photoluminescence in a Ga(AsBi) structure is modelled in an excitonic hopping model and compared to experiment. It is shown that theory and experiment cannot be brought into agreement when using a single energy scale. Thus, a second energy scale is introduced, resulting in a good agreement between theory and experiment. The two scales are identified with spatially large alloy disorder and additional cluster states subdividing this first scale.