Stability of trions in strongly spin-polarized two-dimensional electron gases
- National High Magnetic Field Laboratory, MS E536, Los Alamos, New Mexico 87545 (United States)
- Department of Physics, University of California, Santa Barbara, California 93106 (United States)
- Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
Low-temperature magnetophotoluminescence studies of negatively charged excitons (X{sub s}{sup -} trions) are reported for n-type modulation-doped ZnSe/Zn(Cd,Mn)Se quantum wells over a wide range of Fermi energy and spin splitting. The magnetic composition is chosen such that these magnetic two-dimensional electron gases are highly spin polarized even at low magnetic fields, throughout the entire range of electron densities studied (5x10{sup 10} to 6.5x10{sup 11} cm-2). This spin polarization has a pronounced effect on the formation and energy of X{sub s}{sup -}, with the striking result that the trion ionization energy (the energy separating X{sub s}{sup -} from the neutral exciton) follows the temperature- and magnetic field-tunable Fermi energy. The large Zeeman energy destabilizes X{sub s}{sup -} at the {nu}=1 quantum limit, beyond which a separate photoluminescence peak appears and persists to 60 T, suggesting the formation of spin-triplet charged excitons. (c) 2000 The American Physical Society.
- OSTI ID:
- 20216883
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 61, Issue 24; Other Information: PBD: 15 Jun 2000; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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