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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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Journal ArticleDOI
TL;DR: The optical absorption spectra of polyacetylene and BF 4 − doped polypyrrole have been found to depend on the pressure in the pressure range below the atmospheric pressure as discussed by the authors.
Journal ArticleDOI
TL;DR: In this article, large-radius translation invariant bipolarons were considered in a one-dimensional Holstein molecular chain and the stability of their stability was evaluated for superconductivity in 1D-systems.
Abstract: Large-radius translation invariant (TI) bipolarons are considered in a one-dimensional Holstein molecular chain. Criteria of their stability are obtained. The energy of a translation invariant bipolaron is shown to be lower than that of a bipolaron with broken symmetry. The results obtained are applied to the problem of superconductivity in 1D-systems. It is shown that TI-bipolaron mechanism of Bose-Einstein condensation can support superconductivity even for infinite chain.
01 Jan 1999
TL;DR: The molecular structures of the polaron and the bipolaron in poly-para-phenylene (PPP) were calculated by an ab initio molec- ular orbital (MO) method with fairly sophisticated approximations as mentioned in this paper.
Abstract: The molecular structures of the model systems of the polaron and the bipolaron in poly-para- phenylene (PPP) were calculated by an ab initio molec- ular orbital (MO) method with fairly sophisticated approximations. The calculated models are monocat- ions, dications, monoanions and dianions of biphenyl, para-terphenyl, para-quaterphenyl, para-quinquephenyl and para-hexaphenyl. The calculations show that the longer the PPP oligomer is, the stronger is the tendency to take on a non-planar twisting structure. This was accounted for by the combination of repulsions between proximate ortho-hydrogen atoms with resonance inter- actions between benzene p MOs. The magnitude of the resonance interactions was assessed by using the sym- metry of benzene p MOs as well as an analytical Huckel solution of the p MO for polyene. In addition, negatively charged polarons and bipolarons were found to have a stronger tendency to take on a planar structure than positively charged ones. This result was also explained by comparing the benzene p HOMO with the benzene p LUMO.
Journal ArticleDOI
TL;DR: An explanation of the spin gap observed by Bucher et al. as mentioned in this paper in the conductivity of YBa2Cu4O8 is given, based on the bipolaron theory of these materials.
Abstract: An explanation of the spin gap observed by Bucher et al. in 1993 in the conductivity of YBa2Cu4O8 is given, based on the bipolaron theory of these materials.
Journal ArticleDOI
TL;DR: In this article, the bound state of two-electrons and the existence of a bipolaron are studied using the expression of the effective potential of interactions in crystals by considering in addition to the electron-lattice, also the electronelectron, i.e. electron-plasma interaction.
Abstract: The bound state of two-electrons and the existence of a bipolaron are studied using the expression of the effective potential of interactions in crystals by considering in addition to the electron-lattice, i.e. electron-phonon interaction, also the electron-electron, i.e. electron-plasma interaction. It is shown that the electron-electron interaction strengthens the bound state, making the potential gap deeper and wider, and leads to the appearance of a supplementary narrow gap, the so-called “plasma gap”. The conditions for the existence of the bound state of two electrons, i.e. a bipolaron, are established and the case of germanium is analyzed in detail. The result of calculating the energy minimum value and the effective potential contains — as limit cases in the single-electron approximation — the well-known results given in literature.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202229
202127
202023
201920
201833