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Formation of Intermediate Coupling Optical Polarons and Bipolarons in Two-Dimensional Systems
TLDR
In this article, the formation of the optical polaron and bipolaron in two-dimensional (2D) systems were studied in the intermediate electron-phonon coupling regime.Abstract:
he formation of the optical polaron and bipolaron in two-dimensional (2D) systems are studied in the intermediate electron-phonon coupling regime. The total energies of 2D polaron and bipolaron are calculated by using the Buimistrov-Pekar method of canonical transformations and analyzed in the weak, intermediate and strong coupling regimes. It is shown that the electron-phonon correlation significantly reduces the total energy of 2D polaron in comparison with the energy of the strong-coupling (adiabatic) polaron. A charge carrier in polar crystals remains localized in a 2D potential well when the electron-phonon coupling constant $\alpha$ is greater than the critical value $\alpha_{c}\simeq2.94$, which is much lower than a critical value of the electron-phonon coupling constant $\alpha$ for a 3D system. The critical values of the electron-phonon coupling constant $\alpha$ and the parameter of Coulomb repulsion between two carriers $\beta=1/(1-\epsilon_{\infty}/\epsilon_{0})$ (where $\epsilon_{\infty}$ and $\epsilon_{0}$ are the high frequency and static dielectric constants, respectively), which determine the bipolaron stability region, are numerically calculated. The obtained results are compared with the ones obtained by using the Feynman path integral method and the modified Lee-Low-Pines unitary transformation method.read more
Citations
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Polarons and bipolarons in two-dimensional systems
TL;DR: In this paper , the potential of pair interaction for the singlet states of polarons was carried out in the region intermediate coupling, and the variational functions have been selected in the form of a multiparameter system of Gaussian functions with exponentially correlated multipliers.
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Energy of interaction between polarons and spatial configuration of bipolaron in two-dimensional systems
ReportDOI
Photoinduced Self-Localized Structural Distortions in YBa2Cu3O7-delta: Direct Evidence of Polarons or Bipolarons
TL;DR: In this article, photo-induced infrared active vibrations (IRAV) modes, associated phonon bleachings, and an electronic transition from a localized gap state peaked at 1050/cm (0.13 eV).
Journal ArticleDOI
Polarons and bipolarons in one-dimensional systems (arbitrary coupling)
TL;DR: In this article , the properties of a one-dimensional polaron and a bipolaron in the region of strong and intermediate coupling were investigated using the variational method using wave functions of various types.
References
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