Ultrafast few-fermion dynamics in single self-assembled InGaAs/GaAs quantum dots
| Autor: | Gerhard Abstreiter, Markus Betz, M. Zecherle, C. Ruppert, E. C. Clark, Jonathan J. Finley |
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| Rok vydání: | 2011 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics education.field_of_study Condensed Matter::Other business.industry Exciton Population Physics::Optics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Quantum dot Picosecond Optoelectronics business education Coherent spectroscopy Ultrashort pulse Biexciton Quantum tunnelling |
| Zdroj: | Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV. |
| ISSN: | 0277-786X |
| Popis: | We review a comprehensive study of the ultrafast optoelectronic properties of a single self-assembled InGaAs/GaAs quantum dot. While manipulation of the artificial atom relies on two widely and independently tunable picoseconds pulse trains, sensitive readout is achieved via the ~pA photocurrent of the diode device. In particular, the absorption changes after occupation of an s-shell exciton reveal a biexciton absorption line as well as previously unobserved p-shell transitions in the presence of s-shell population. In addition, time-resolved data directly maps the picosecond tunneling times of electrons and holes out of the dot. Beyond these incoherent phenomena, we also realize coherent QD manipulations. Those comprise well-known excitonic Rabi-oscillations as well as single-pulse biexciton generation and conditional Rabi-oscillations of the exciton-biexciton transition after deterministic exciton preparation. |
| Databáze: | OpenAIRE |
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