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Is polaron effect important for resonant Raman scattering in self-assembled qua...
Vasilevskiy, Mikhail; Miranda, R. P.While the diagonal (or intra-level) interaction of a confined exciton with optical phonons in selfassembled quantum dots (SAQD’s) is rather weak, the non-diagonal one can lead to a considerable change of the exciton spectrum and the formation of a polaron. An impact of this effect on resonant inelastic light scattering is studied theoretically. The polaron spectrum is obtained by numerical diagonalisation of th...
Polaron effect on Raman scattering in semiconductor quantum dots
Vasilevskiy, Mikhail; Miranda, R. P.; Anda, Enrique; Makler, SergioStrong coupling of a confined exciton to optical phonons in semiconductor quantum dots (QDs) leading to the formation of a polaron is considered for a model system including two lowest exciton states and several optical phonon modes. Both intra- and inter-level terms are taken into account. The Hamiltonian has been exactly diagonalized including a finite number of phonons allowed for each mode, large enough to ...
Mixed optical phonon modes in semiconductor nanocrystals synthesized in porous ...
Belogorokhov, Alexander; Belogorokhova, Lyuba; Miranda, R. P.; Vasilevskiy, Mikhail; Gavrilov, S. A.This work is devoted to experimental and theoretical studies of optical phonons confined in CdS nanocrystals grown inside a porous alumina matrix. The complete sets of phonon modes, confined in a spherical quantum dot and in a cylindrical quantum wire, are considered in the framework of a continuum model, which allows the mixing of all the expected types of vibrations. It is shown that the calculated phonon-rel...
Finite-size scaling study of the ballistic deposition model in (1+1)-dimensions
Miranda, R. P.; Ramos, Marta M. D.; Cadilhe, A. M.We performed extensive Monte Carlo simulations of the ballistic deposition model in (1 + 1)-dimensions for several system sizes up to 1280 lattice constants, on the square lattice. Though the ballistic deposition model is generally accepted to belong to the Kardar Parisi-Zhang (KPZ) universality class, strong corrections to scaling prevent numerical estimates of the exponents close to the asymptotic values. We ...
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