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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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TL;DR: In this paper, the binding energy of optical bipolaron in symmetric quantum dot systems is obtained by computing the energy of the fundamental state, the ground state of the single polaron, and the prime state excited energy.
Abstract: Optical bipolaron’s stability and decoherence confined in the symmetric quantum dot are investigated utilizing the modified Lee, Low, and Pines variational method. The binding energy of optical bipolaron in symmetrical quantum dot systems is obtained by computing the energy of the fundamental state, the energy of the ground state of the single polaron, and the prime state excited energy. The formation of the bipolaron in quantum dot structures is thus obtained. Optical bipolaron stability appears to be quite sensitive to the dimensionality of the quantum dot and the material, where α and η material parameters are considered. By investigating information processing, it is possible to compute Shannon’s entropy to study a qubit’s decoherence when in the superimposed state of the fundamental and the prime state excited. We see that decoherence time grows and shrinks with the dielectric constant and the dispersion coefficient. Thus, there exists a threshold dielectric constant and dispersion coefficient which maximizes decoherence time. This threshold dielectric constant and dispersion coefficient increases with the reduction in electron–phonon coupling. This study gives a guideline for the appropriate materials used in the construction of nanodevice.
01 Jan 2008
TL;DR: In this article, the bipolaron theory of unconventional proximity effects, symmetry and checkerboard modulations of the order parameter and quantum magneto-oscillations discovered recently in cuprates are reviewed.
Abstract: There is compelling evidence for a strong electron-phonon interaction (EPI) in cuprate superconductors from the isotope effects on the supercarrier mass, high resolution angle resolved photoemission spectroscopies (ARPES), a number of optical and neutron-scattering measurements in accordance with our prediction of high-temperature superconductivity in polaronic liquids. A number of observations point to the possibility that high-Tc cuprate superconductors may not be conven- tional Bardeen-Cooper-Schrieffer (BCS) superconductors, but rather derive from the Bose-Einstein condensation (BEC) of real-space pairs, which are mobile small bipolarons. Here I review the bipolaron theory of unconventional proximity effects, the symmetry and checkerboard modulations of the order parameter and quantum magneto-oscillations discovered recently in cuprates.
TL;DR: In this article, the generalized Hubbard model for two CuO2 sheets was used to model the hole magnetic bipolaron inter-sheet decay processes, which can lead to stability of singlet pair state on the background of the singlet short-range RVB-type state of the Cu-spin subsystem.
TL;DR: In this paper, a mixture of bis-Wittig reagents and bis-phosphonate esters containing one or two conjugated double bonds was used to obtain polaronic (radical cation) and bipolaronic (dication) charge states.
Abstract: α,ω-Dithienyl polyenes can be prepared from appropriately substituted 2-thienyl or 3-thienyl carbaldehydes or propenals by condensation with either bis-Wittig reagents or bis-phosphonate esters (Horner–Emmons–Wadsworth modifications) containing one or two double bonds. These polyenes, containing either 3,4,5 or 6 conjugated double bonds, can be oxidatively doped with SbCl5, in solution, forming polaronic (radical cation) and bipolaronic (dication) charge states by successive one-electron transfers. In all cases, the bipolaron is the more stable charge state.
01 Jan 2001
TL;DR: In this article, the authors attributed the softening bipolaron properties to the singlets being formed amongst four-fold degenerate icosahedral orbitals, a type of bipolaron that softens the symmetry-breaking vibrational modes to which they are coupled.
Abstract: Holes in boron carbides pair to form singlet bipolarons on twelve-atom icosahedral structures. Transport occurs by carriers hopping between icosahedra. However, the optical conductivity and the Seebeck coefficients differ qualitatively from expectations for small bipolarons. These novel features are attributed to the singlets being formed amongst four-fold degenerate icosahedral orbitals. In particular, carriers in highly degenerate states can form a novel type of bipolaron, a “softening bipolaron.” Distinctive features of softening bipolarons result from singlets’ softening the symmetry-breaking vibrational modes to which they are coupled.