Magneto-optical properties of charged excitons in quantum dots
| Autor: | Pierre Petroff, Winston V. Schoenfeld, Alexander O. Govorov, A. V. Chaplik, A. V. Kalameitsev, D. Haft, Richard J. Warburton, C. Schulhauser, K. Karrai, Jorge M. Garcia |
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| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Photoluminescence Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter::Other Exciton FOS: Physical sciences Charge (physics) Curvature Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Magnetic field Magneto optical Condensed Matter::Materials Science Condensed Matter - Strongly Correlated Electrons Quantum dot Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Diamagnetism |
| Zdroj: | Scopus-Elsevier Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 4 páginas, 3 figuras.-- PACS number(s): 78.67.Hc, 73.40.Rw, 78.66.Fd We present results on the influence of a magnetic field on excitons in semiconductor quantum dots, concentrating on the diamagnetic curvature. We use samples with a bimodal ensemble photoluminescence (PL) and we find that for the low-energy PL branch, the diamagnetic curvature is independent of charge, yet for the high-energy branch, the diamagnetic curvature is strongly reduced with excess charge. Guided by model calculations, we interpret the two classes as typical of the strong and intermediate confinement regimes. In the light of this, we predict that in the weak confinement regime the excitonic diamagnetic shift is strongly dependent on surplus charge, corresponding to a reversal in sign of the conventional diamagnetic shift for neutral excitons. This work was supported by the DFG (Grant No. SFB348) and EPSRC. One of us, A.O.G., acknowledges financial support from the Rufus Putnam Visiting Professorship and the Volkswagen Foundation. |
| Databáze: | OpenAIRE |
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