Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.147402
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Funding
- RFBR [13-02-00316-a]
- Samsung GRO Project
- Russian Ministry of Education and Science [11.G34.31.0067]
- Russian Ministry of Education and Science (SPbSU)
- Dmitry Zimin Dynasty Foundation
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The excitations of a two-dimensional electron gas in quantum wells with intermediate carrier density (n(e) similar to 10(11) cm(-2)), i.e., between the exciton-trion and the Fermi-sea range, are so far poorly understood. We report on an approach to bridge this gap by a magnetophotoluminescence study of modulation-doped (Cd,Mn)Te quantum well structures. Employing their enhanced spin splitting, we analyzed the characteristic magnetic-field behavior of the individual photoluminescence features. Based on these results and earlier findings by other authors, we present a new approach for understanding the optical transitions at intermediate densities in terms of four-particle excitations, the Suris tetrons, which were up to now only predicted theoretically. All characteristic photoluminescence features are attributed to emission from these quasiparticles when attaining different final states.
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