Abstract
The excitations of a two-dimensional electron gas in quantum wells with intermediate carrier density (ne ∼ 1011 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.
Original language | English |
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Article number | 147402 |
Pages (from-to) | 1-5 |
Number of pages | 5 |
Journal | Physical Review Letters |
Volume | 112 |
Issue number | 14 |
Early online date | 8 Apr 2014 |
DOIs | |
Publication status | Published - 11 Apr 2014 |
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Daniel Wolverson
- Department of Physics - Professor
- Centre for Sustainable Chemical Technologies (CSCT)
- Centre for Nanoscience and Nanotechnology
- Condensed Matter Physics CDT
- Condensed Matter and Quantum Materials
- Institute of Sustainability and Climate Change
- NanoBioPhotonics
Person: Research & Teaching, Core staff, Affiliate staff