Observation of preformed electron-hole Cooper pairs in highly excited ZnO
| Autor: | Versteegh, M.A.M., van Lange, A.J., Stoof, H.T.C., Dijkhuis, J.I., Nanophotonics, Theoretical Physics, Sub Physics of Condensed Matters begr, Sub Cond-Matter Theory, Stat & Comp Phys |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
Superconductivity Condensed Matter::Quantum Gases Condensed matter physics business.industry Condensed Matter::Other Exciton Electron hole Electron Condensed Matter Physics Electronic Optical and Magnetic Materials Semiconductor Excited state Condensed Matter::Superconductivity Bound state Cooper pair business |
| Zdroj: | Physical review. B, Condensed matter and materials physics, 85(19), 195206. American Physical Society |
| ISSN: | 1098-0121 |
| Popis: | Electrons and holes in a semiconductor form hydrogen-atom-like bound states, called excitons. At high electron-hole densities the attractive Coulomb force becomes screened and excitons can no longer exist. Bardeen-Cooper-Schrieffer theory predicts that at such high densities co-operative many-body effects can at low temperatures induce a bound state, an electron-hole Cooper pair, comparable to an electron-electron Cooper pair in a superconductor. Here we report the first observation of preformed electron-hole Cooper pairs in a semiconductor. By measuring stimulated emission from a dense electron-hole gas in ZnO, we have explored both the crossover from the electron-hole plasma to the preformed Cooper-pair regime, and the crossover from the exciton to the preformed Cooper-pair regime. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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