Topic
Bipolaron
About: Bipolaron is a research topic. Over the lifetime, 1335 publications have been published within this topic receiving 29154 citations. The topic is also known as: bipolarons.
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TL;DR: In this paper, the exact polaron and bipolaron Green's functions for a model with a highly inhomogeneous electron-boson coupling were derived, where the polaron ground-state energy and quasiparticle weight are similar to those of the Holstein polaron with equal effective coupling.
Abstract: We derive the exact polaron and bipolaron Green's functions for a model with a highly inhomogeneous electron-boson coupling , where . While the polaron ground-state energy and quasiparticle weight are similar to those of the Holstein polaron with equal effective coupling, the polaron dispersion is very different. Unlike that of a Holstein polaron, which is monotonically increasing with the polaron momentum, the polaron dispersion in this case is folded inside the Brillouin zone. For strong coupling, the polaron and bipolaron effective masses increase linearly with the effective coupling and exhibit no isotope effect, as opposed to an exponential increase and a strong isotope effect, in the Holstein model. As a result, this model exhibits strongly bound yet light bipolarons at strong couplings. Generalizations are discussed.
10 citations
TL;DR: In this paper, structural changes were found by an X-ray scattering study in β-vanadium bronze compounds, having a localized one-dimensional electron system, which were attributed to a possible ordering of the bipolarons which are expected to be formed on vanadium chains by strong electron-phonon coupling.
10 citations
TL;DR: In this article, the ground state remains spherical for small values of the electron-electron Coulomb repulsion in the Pekar-Tomasevich approximation of the bipolaron.
Abstract: We consider the bipolaron in the Pekar--Tomasevich approximation and address the question whether the ground state is spherically symmetric or not. Numerical analysis has, so far, not completely settled the question. Our contribution is to prove rigorously that the ground state remains spherical for small values of the electron-electron Coulomb repulsion.
10 citations
TL;DR: In this article, the authors obtained the dynamic equations for a polaron and bipolaron in a DNA duplex on the basis of Holstein-Hubbard Hamiltonian and showed that in a Poly A/Poly T duplex especially stable is a bipolaron state in which holes are localized on different chains of the duplex.
Abstract: Dynamical equations for a polaron and bipolaron in a DNA duplex are obtained on the basis of Holstein-Hubbard Hamiltonian. It is shown that in a Poly A/Poly T duplex especially stable is a bipolaron state in which holes are localized on different chains of the duplex. With the use of the polaron and bipolaron free energy, the temperature of bipolaron decay is found to be Td ≈ 350 K which can serve as an approximate estimate of the superconducting transition temperature. The way of constructing superconducting nanowires on the basis of DNA is suggested.
10 citations
TL;DR: In this paper, the temperature dependence of the high-temperature superconductor surface resistance is calculated on the basis of the bipolaron Bose condensation model, and the correlation between the theoretical results and experimental data is discussed.
Abstract: The temperature dependence of the high-temperature superconductor surface resistance is calculated on the basis of the bipolaron Bose condensation model. The correlation between the theoretical results and experimental data is discussed. Several constituents of the residual resistance are described.
10 citations