Observation of free and bound excitons associated with the two-dimensional electron gas in modulation-doped heterostructures
- 15 April 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 49 (16) , 11456-11458
- https://doi.org/10.1103/physrevb.49.11456
Abstract
Overlapping bulk and two-dimensional excitons have been observed in modulation-doped heterostructures. Their differing behavior in a magnetic field allows them to be studied separately. Both free and bound excitons, associated with the two-dimensional electron gas, have been observed in the photoluminescence spectra of these structures. These excitons show a reduced binding energy due to screening and are found in a region of the structure where band-gap renormalization occurs due to many-body interactions. The two-dimensional excitons are identified from measurements conducted in applied magnetic fields.Keywords
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