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SM ISO690:2012 POKATILOV, Evghenii, BALABAN, Serghei, KLIMIN, Serghei, FOMIN, Vladimir, DEVREESE, Josef T.. Bipolaron binding in quantum wires. In: Physical Review B - Condensed Matter and Materials Physics, 2000, vol. 61, pp. 2721-2728. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.61.2721 |
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Physical Review B - Condensed Matter and Materials Physics | ||||||
Volumul 61 / 2000 / ISSN 1098-0121 /ISSNe 1550-235X | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.61.2721 | ||||||
Pag. 2721-2728 | ||||||
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Rezumat | ||||||
A theory of bipolaron states in quantum wires with a parabolic potential well is developed applying the Feynman variational principle. The basic parameters of the bipolaron ground state (the binding energy, the number of phonons in the bipolaron cloud, the effective mass, and the bipolaron radius) are studied as a function of sizes of the potential well. Two cases are considered in detail: a cylindrical quantum wire and a planar quantum wire. Analytical expressions for the bipolaron parameters are obtained at large and small sizes of the quantum well. It is shown that at (Formula presented) [where (Formula presented) means the radius (half width) of a cylindrical (planar) quantum wire, expressed in Feynman units], the influence of confinement on the bipolaron binding energy is described by the function (Formula presented) for both cases, while at small sizes this influence is different in each case. In quantum wires, the bipolaron binding energy (Formula presented) increases logarithmically with decreasing radius. The shapes and the sizes of a nanostructure, which are favorable for observation of stable bipolaron states, are determined. |
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Cuvinte-cheie GAUSSIAN, Gene Conversion, Cyclotron Frequency |
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