Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-09-27
Phys. Rev. B 72, 235306 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 12 figures
Scientific paper
10.1103/PhysRevB.72.235306
The optical properties of two-dimensional electron gases in ZnSe/(Zn,Be)Se and ZnSe/(Zn,Be,Mg)Se modulation-doped quantum wells with electron densities up to 1.4x10^{12} cm^{-2} were studied by photoluminescence, photoluminescence excitation and reflectivity in a temperature range between 1.6 and 70 K and in external magnetic fields up to 48 T. In these structures, the Fermi energy of the two-dimensional electron gas falls in the range between the trion binding energy and the exciton binding energy. Optical spectra in this regime are shown to be strongly influenced by the Coulomb interaction between electrons and photoexcited holes. In high magnetic fields, when the filling factor of the two-dimensional electron gas becomes smaller than two, a change from Landau-level-like spectra to exciton-like spectra occurs. We attempt to provide a phenomenological description of the evolution of optical spectra for quantum wells with strong Coulomb interactions.
Astakhov Georgy V.
Crooker Scott A.
Keller Dave
Molenkamp Laurens W.
Ossau W.
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