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: A series of conjugated building blocks based on the thieno[3,4-f][1,2,3, 4,5]pentathiepine (C4S6) core has been synthesized by a new synthetic approach.
21 citations
TL;DR: In this article, the stability of a bipolaron as a function of the strength of the long range Coulomb interaction with and without impurities for both weak and strong electron-phonon coupling was studied.
21 citations
TL;DR: In this article, a mean-field theory for heavy polarons in a one-dimensional Bose gas is presented, which is based on a nonperturbative theory and complemented with exact numerical simulations.
Abstract: Bose polarons, quasiparticles composed of mobile impurities surrounded by cold Bose gas, can experience strong interactions mediated by the many-body environment and form bipolaron bound states. Here we present a detailed study of heavy polarons in a one-dimensional Bose gas by formulating a nonperturbative theory and complementing it with exact numerical simulations. We develop an analytic approach for weak boson-boson interactions and arbitrarily strong impurity-boson couplings. Our approach is based on a mean-field theory that accounts for deformations of the superfluid by the impurities and in this way minimizes quantum fluctuations. The mean-field equations are solved exactly in the Born-Oppenheimer approximation, leading to an analytic expression for the interaction potential of heavy polarons, which is found to be in excellent agreement with quantum Monte Carlo (QMC) results. In the strong coupling limit, the potential substantially deviates from the exponential form valid for weak coupling and has a linear shape at short distances. Taking into account the leading-order Born-Huang corrections, we calculate bipolaron binding energies for impurity-boson mass ratios as low as 3 and find excellent agreement with QMC results.
21 citations
TL;DR: In this article, the out-of-plane resistance and the resistive upper critical field of BSCCO-2212 single crystals with Tc0 91-93 K were measured in magnetic fields up to 50 T over a wide temperature range.
Abstract: The out-of-plane resistance and the resistive upper critical field of BSCCO-2212 single crystals with Tc0 91–93 K have been measured in magnetic fields up to 50 T over a wide temperature range. The results are characterised by a positive linear magnetoresistance in the superconducting state and a negative linear magnetoresistance in the normal state. The zero-field normal-state c-axis resistance, the negative linear normal-state magnetoresistance, and the divergent upper critical field Hc2(T) are explained in the framework of the bipolaron theory of superconductivity.
20 citations
TL;DR: BaTi1−xNbxO3 films, spanning the entire range of x, have been deposited on MgAl2O4 substrates and X-ray diffraction measurements indicate single phase films for all values of x as discussed by the authors, contrary to a previously reported niobium solubility limit.
Abstract: BaTi1−xNbxO3 films, spanning the entire range of x, have been deposited on MgAl2O4 substrates. X-ray diffraction measurements indicate single phase films for all values of x, contrary to a previously reported niobium solubility limit. Films show extreme sensitivity to high temperature oxygen exposure, which destroys conductivity and severely disrupts crystallinity. Under optimum growth conditions increasing x gives rise to a Ti4+ to Ti3+ transformation in the oxidation state accompanied by increased conductivity with a semiconductor-metal transition near x=0.2. Temperature dependent magnetic measurements show an anomalous rise in the spin moment, a feature supportive of the small singlet bipolaron model.
20 citations