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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:14 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Solid State Physics and Materials Science
Title:
Energy-momentum relation for optical polarons confined in a uniaxial anisotropic quantum wire
Authors:
D. E. N. Brancus, L. Ion
Affiliation:
University of Bucharest, Faculty of Physics, Solid State Physics Dept.
E-mail
dane@solid.fizica.unibuc.ro
Keywords:
optical polarons, anisotropic quantum wire, GaN
Abstract:
In the context of the improved Wigner-Brillouin perturbation theory, the energy spectrum of an optical polaron confined in a uniaxial cylindrical quantum wire is obtained. For small momentum values, the results concerning the polaron spectrum are quite similar to that obtained by using the Rayleigh-Schrodinger perturbation theory. However, unlike the isotropic case, in the uniaxial anisotropic quantum wire the conduction electrons interact with the quasi-transverse phonon modes, which results in important modifications of the polaron spectrum in the range of large momentum values: a) the energy-momentum dispersion curve presents a splitting into two branches; b) for energies close to the quasi-transverse-phonon-emission spectrum, the lower polaron branch is pinned to a certain energy value, determining also the existence of a negative polaron effective mass for large momentum values. The general results are particularized for the case of polar semiconductor GaN.
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