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, photoinduced defects in the intermediate strength charge density wave bromide-bridged platinum linear chain (PtBr) have been examined by resonance Raman and electron paramagnetic resonance spectroscopies.
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TL;DR: In this article, the geometries, the linear (α) and third-order (γ) polarizabilities of several bipolaron model compounds and cyanines were computed using the semi-empirical AM1 parameterization.
Abstract: The geometries, the linear (α) and third-order (γ) polarizabilities of several bipolaron model compounds and cyanines are computed using the semi-empirical AM1 parameterization. The effects of aromaticity, charge localization and bond length alternation are considered.
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TL;DR: In this paper, a variational calculation was performed to probe the existence of Fr{´o´hlich bipolarons in polar semiconductors. But they were only able to interpolate between the weak and strong coupling limits of the electron-phonon interaction and were not aware of any existing materials at these parameter values.
Abstract: Following a resurgence of interest in dilute superconductivity in polar semiconductors, we perform a variational calculation to probe the existence of Fr{\"o}hlich bipolarons in these materials. Our solution is capable of interpolating between the weak- and strong-coupling limits of the electron-phonon interaction. We predict bipolaron formation in solely the strong-coupling regime, and we are not aware of any existing materials at these parameter values. However, imposing an extrinsic electron size constraint to mimic confinement on the sub-micron scale produces binding in new parts of the phase diagram, including at weak coupling, within reach of the near-ferroelectric perovskites.
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TL;DR: In this paper, the motion of a bipolaron under an external electric field is theoretically investigated in a conjugated polymer with magnetic impurities, and it is shown that the bipolaron can pass through the magnetic impurity, or break down into two polarons with different spins, depending on the width of the impurity region.
Abstract: Both polarons and bipolarons are composite particles with internal structures in nondegenerate conjugated polymers. A bipolaron is a spinless species with charge ±2|e|, while a polaron is a spin-bearing one (spin 1/2, charge ±|e|). Serving as charge carriers, they play an important role in the transport properties of polymer-based optoelectronic devices. By using a nonadiabatic dynamic method, the motion of a bipolaron under an external electric field is theoretically investigated in a conjugated polymer with magnetic impurities. Our results show that a bipolaron can pass through the magnetic impurities, or break down into two polarons with different spins, or be trapped by the magnetic impurities, depending on the width of the impurity region. When the width of the impurity region is comparable to the polaron width, the bipolaron is transformed into two polarons easily. As a polaron and a bipolaron possess different spin characteristics, the decomposition of bipolarons induced by the magnetic impurities ...
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TL;DR: In this article , numerically exact simulations of the Bose one-component plasma with pairwise Coulomb interactions among particles and a uniform neutralizing background have been presented, where the Coulomb potential causes the weakly interacting limit to be approached at high density.
Abstract: We present results of numerically exact simulations of the Bose one-component plasma, i.e., a Bose gas with pairwise Coulomb interactions among particles and a uniform neutralizing background. We compute the superconducting transition temperature for a wide range of densities, in two and three dimensions, for both continuous and lattice versions of the model. The Coulomb potential causes the weakly interacting limit to be approached at high density, but gives rise to no qualitatively different behavior, vis-à-vis the superfluid transition, with respect to short-ranged interactions. Our results are of direct relevance to quantitative studies of bipolaron mechanisms of (high-temperature) superconductivity.