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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: In this paper, a phase diagram for the charge and spin dynamics of an interacting gas of small (bi)polarons across the discontinuous conducting transition is proposed for understanding the long-standing conundrum of Mooij correlations.
Abstract: We performed electron spin-resonance (ESR), magnetic, and optical absorption studies of a model system used to investigate the metal-insulator transition in a deformable lattice. The ESR and magnetic studies revealed that the small polarons have no correlation to the conductivity below or above the mobility edge. The conducting transition is marked by the appearance of an asymmetric ESR signal simultaneously with a significant suppression of the small bipolaron optical absorption band indicating that the extended states result from an abrupt dissociation of the small bipolarons. Immediately above the mobility edge competing phases of extended states, small polarons, and small bipolarons coexist. We propose a phase diagram for the charge and spin dynamics of an interacting gas of small (bi)polarons across the discontinuous conducting transition that has implications for understanding the long-standing conundrum of Mooij correlations.

2 citations

Journal ArticleDOI
TL;DR: In this article, the spin and charge pseudogap features in high T c cuprate can be traced back to the dynamical properties on small clusters (consisting of Cu ions together with their ligand O ions environments) which make up the overall structure of these materials.
Abstract: The spin as well as charge pseudogap features in the high T c cuprate can be traced back to the dynamical properties on small clusters (consisting of Cu ions together with their ligand O ions environments) which make up the overall structure of these materials. These ligand complexes being deformable, causes the itinerant electrons on the Cu ions to enter into resonating bipolaron states via binary collision processes, similar to the Feshbach resonance in ultra-cold fermionic gases. We illustrate such resonant pairing on an isolated cluster and discuss how, upon coupling together such clusters, the local physics evolves into global macroscopic features, such as lattice mediated driven superconducting, respectively insulating, states of such resonating bipolarons.

2 citations

Journal ArticleDOI
TL;DR: In this article, a model dendrimers based on bis-(diphenylamino)stilbene repeat units have been synthesized and shown to have very stable bipolaronic charge states.
Abstract: Model dendrimers based on bis-(diphenylamino)stilbene repeat units have been synthesized and shown to have very stable bipolaronic charge states. Calculations at the AM-1 level predict two orders magnitude enhancement in the third-order nonlinearity in going from the neutral to bipolaron state. Measurement of two-photon cross-sections for PPV dimers with attached diphenylamino donor groups show enhanced two-photon cross-sections for ns pulses. Preliminary evaluation of one of the model dendrimers indicates even larger two-photon cross-sections are possible.

2 citations


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