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 article, the perturbation theory was used to calculate the energy bands of the bipolaron and the free-polaron, in order to investigate the stabilities of the singlet and the triplet bipolaron states.
Abstract: We have used the perturbation theory to calculate the energy bands of the bipolaron and the free-polaron, in order to investigate the stabilities of the singlet and the triplet bipolaron states. By analyzing the specific heat and the magnetic susceptibility, we illustrate the importance of the triplet bipolaron state in understanding the experimental data.
1 citations
TL;DR: In this article, chemical structure studies of high-temperature superconductors are elucidated, which show a tendency toward isometric bond order which correlates positively with increasing critical temperature.
Abstract: Critical results from chemical structure studies of high-temperature superconductors are elucidated which show a tendency toward isometric bond order which correlates positively with increasing critical temperature. Evidence from phonon, interstitial charge density, oxygen ordering and pressure effects, and lattice instability studies is summarized, and congruence with configuration interaction symmetry and bipolaron models is noted. Prospective high-temperature superconductors are identified.
1 citations
21 Aug 2020
TL;DR: In this paper, a quinoid-resonant building block thieno[3,4-b]thiophene (TbT) was used to develop a new water-dispersible conducting polymer, PTbT-Me:PSS.
Abstract: Developing stable and solution-processable highly conductive polymers has been the research goal in organic electronics since the first demonstration of metallic conductive polyacetylene. Here, we used a unique quinoid-resonant building block thieno[3,4-b]thiophene (TbT) to develop a new water-dispersible conducting polymer, PTbT-Me:PSS. Linear polymerization and large surfactant counterion, poly(styrenesulfonate) (PSS−), were introduced, which enabled a high electrical conductivity of 68 S cm−1 and exhibited water-dispersible property. Interchain bipolaron was found in PTbT-Me:PSS when compared with polaron in PEDOT:PSS in their conducting mechanism. Moreover, we applied this highly conductive PTbT-Me:PSS as the solution-processed polymer thermoelectric material and a decent power factor of 3.1 μW m−1 K−2 was achieved.
1 citations
TL;DR: In this article, a more realistic model with strong on-site repulsive correlations, the Coulomb and strong finite-range electron-phonon interactions, was proposed, which describes key features of the cuprates, in particular their T values, different isotope effects, normal state pseudogaps, and spectral functions measured in tunnelling and photoemission.
Abstract: Over the last decade several competing models of high-temperature superconductivity were proposed, most of them with short-range interactions. We review a more realistic model with strong on-site repulsive correlations, the Coulomb and strong finite-range electron-phonon interactions. Bipolarons in the model exist in the itinerant Bloch states at temperatures below about half of the characteristic phonon frequency. Depending on the ratio of the inter-site Coulomb repulsion and the polaron level shift, the ground state of the model is a polaronic Fermi (or Luttinger) liquid, bipolaronic high-T c superconductor, or charge-segregated insulator for the strong, intermediate, and weak Coulomb repulsion, respectively. Two particular lattices are analysed in detail: a chain with the finite range electron-phonon interaction and a zig-zag ladder. Charge carriers in the ladder are superlight mobile intersite bipolarons. They propagate coherently without emission or absorption of phonons with about the same mass as single polarons. The model describes key features of the cuprates, in particular their T values, different isotope effects, normal state pseudogaps, and spectral functions measured in tunnelling and photoemission.
1 citations
TL;DR: In this article, the stability of a bipolaron in a single polymer chain coupled with dopants considering up to the nearest-neighbour site diagonal electron phonon (e - p) interactions was examined.
Abstract: The stability of a bipolaron is examined in a single polymer chain coupled with dopants considering up to the nearest-neighbour site diagonal electron - phonon (e - p) interactions. The behaviour of the bipolaron depending on the e - p coupling constant and the on-site Coulomb repulsion is studied within the framework of unrestricted Hartree - Fock theory using an extended Lang - Firsov transformation and a squeeze transformation. It is shown that dopants play an important role in the stabilization of the bipolaron and, moreover, that this stability appears under subtle conditions. In particular, the bipolaron separates into two polarons by the smaller on-site Coulomb interaction in the strong e - p coupling regime.
1 citations