Observation of Coulomb-Assisted Dipole-Forbidden Intraexciton Transitions in Semiconductors
We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum-well sample. Monitoring the excitonic photoluminescence, we observe transient quenching of the \(1s\) exciton emission, which we attribute...
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| creator | Rice, W D Kono, J Zybell, S Winnerl, S Bhattacharyya, J Schneider, H Helm, M Ewers, B Chernikov, A Koch, M Chatterjee, S Khitrova, G Gibbs, H M Schneebeli, L Breddermann, B Kira, M Koch, S W |
| description | We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum-well sample. Monitoring the excitonic photoluminescence, we observe transient quenching of the \(1s\) exciton emission, which we attribute to the terahertz-induced \(1s\)-to-\(2p\) excitation. Simultaneously, a pronounced enhancement of the \(2s\)-exciton emission is observed, despite the \(1s\)-to-\(2s\) transition being dipole forbidden. A microscopic many-body theory explains the experimental observations as a Coulomb-scattering mixing of the 2\(s\) and 2\(p\) states, yielding an effective terahertz transition between the 1\(s\) and 2\(s\) populations. |
| doi_str_mv | 10.48550/arxiv.1203.3994 |
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Monitoring the excitonic photoluminescence, we observe transient quenching of the \(1s\) exciton emission, which we attribute to the terahertz-induced \(1s\)-to-\(2p\) excitation. Simultaneously, a pronounced enhancement of the \(2s\)-exciton emission is observed, despite the \(1s\)-to-\(2s\) transition being dipole forbidden. A microscopic many-body theory explains the experimental observations as a Coulomb-scattering mixing of the 2\(s\) and 2\(p\) states, yielding an effective terahertz transition between the 1\(s\) and 2\(s\) populations.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1203.3994</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Dipoles ; Eigenvectors ; Emission ; Excitons ; Photoluminescence ; Physics - Mesoscale and Nanoscale Physics ; Populations ; Quantum wells</subject><ispartof>arXiv.org, 2012-12</ispartof><rights>2012. 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| subjects | Dipoles Eigenvectors Emission Excitons Photoluminescence Physics - Mesoscale and Nanoscale Physics Populations Quantum wells |
| title | Observation of Coulomb-Assisted Dipole-Forbidden Intraexciton Transitions in Semiconductors |
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