Polaron in a Quasi 0D Nanocrystal
| Autor: | N. Issofa, V.B. Mborong, A J Fotue, Lukong Cornelius Fai, S Domngang, D Tchassem |
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| Rok vydání: | 2005 |
| Předmět: |
Physics
Condensed matter physics Radius Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Polaron Potential energy Atomic and Molecular Physics and Optics symbols.namesake Maxwell's equations Quantum dot Variational principle symbols Feynman diagram Condensed Matter::Strongly Correlated Electrons Ground state Mathematical Physics |
| Zdroj: | Physica Scripta. 72:333-338 |
| ISSN: | 1402-4896 0031-8949 |
| DOI: | 10.1238/physica.regular.072a00333 |
| Popis: | Polaron states in a spherical quantum dot with a spherical symmetric parabolic confinement potential are investigated applying the Feynman variational principle. Effects of the dot radius on the polaron ground state energy level, the self-action potential energy, the mass and the Frohlich electron–phonon-coupling constant are obtained for a spherical quantum dot. The electron–phonon-coupling amplitude derived from the Maxwell equation in a material medium is used. This yields a better upper bound for strong coupling polaron energy in a spherical quantum dot. The polaron mass, energy and self-action potential energy are found to have a monotonous decrease as the structures' radius increases. As the spherical quantum dot radius is reduced the regimes of weak and intermediate coupling polaron shorten and the strong coupling polaron region broadens and extends into weak and intermediate ones. The main contribution to polaron energy and mass comes from the self-action potential. |
| Databáze: | OpenAIRE |
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