Dark Exciton Preparation in a Quantum Dot by a Longitudinal Light Field Tuned to Higher Exciton States
| Autor: | Tilmann Kuhn, M. Holtkemper, Guillermo Federico Quinteiro, Doris E. Reiter |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter::Other Exciton FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Laser Condensed Matter::Mesoscopic Systems and Quantum Hall Effect law.invention Pulse (physics) Condensed Matter::Materials Science law Quantum dot Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Atomic physics Exciton ground state Mixing (physics) Light field Spin-½ |
| DOI: | 10.48550/arxiv.2003.03205 |
| Popis: | Several important proposals to use semiconductor quantum dots in quantum information technology rely on the control of the dark exciton ground states, such as dark exciton based qubits with a $\mu$s life time. In this paper, we present an efficient way to occupy the dark exciton ground state by a single short laser pulse. The scheme is based on an optical excitation with a longitudinal field component featured by, e.g., radially polarized beams or certain Laguerre-Gauss or Bessel beams. Utilizing this component, we show within a configuration interaction approach that high-energy exciton states composed of light-hole excitons and higher dark heavy-hole excitons can be addressed. When the higher exciton relaxes, a dark exciton in its ground state is created. |
| Databáze: | OpenAIRE |
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