| Autor: |
Köppen, Tim, Franz, Dennis, Schramm, Andreas, Heyn, Christian, Gutjahr, Johann, Pfannkuche, Daniela, Heitmann, Detlef, Kipp, Tobias |
| Rok vydání: |
2010 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.83.165307 |
| Popis: |
We report on resonant optical spectroscopy of self-assembled InGaAs quantum dots in which the number of electrons can accurately be tuned to N=0,1,2 by an external gate voltage. Polarization, wave vector and magnetic field dependent measurements enable us to clearly distinguish between resonant Raman and resonant photoluminescence processes. The Raman spectra for N=1 and 2 electrons considerably differ from each other. In particular, for N=2, the quantum-dot He, the spectra exhibit both singlet and triplet transitions reflecting the elementary many-particle interaction. Also the resonant photoluminescence spectra are significantly changing by varying the number of electrons in the QDs. For N=1 we observe strong polaronic effects which are suppressed for N=2. |
| Databáze: |
arXiv |
| Externí odkaz: |
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