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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the Su-Schrieffer-Heeger model was used to simulate chain hopping of solitons and polarons in polyacetylene polycarbonates.
Abstract: Interchain hopping of solitons and polarons in polyacetylene is studied by numerical simulation of their motion under an electric field. Use is made of the Su-Schrieffer-Heeger model supplemented with intrachain electron-electron interactions and dopant potentials. We find that charged solitons can hop to the opposite chain by forming bound pairs (bipolarons). For the case of polarons also, hopping in a pair is more favorable than single polaron hopping. Interchain hopping of a polaron pair is more efficient than that of a soliton pair.
2 citations
TL;DR: In this article, the value of the Fragohlich electron-phonon interaction in manganites, cuprates, and some other charge-transfer insulators was calculated and it was shown that this interaction is much stronger than any relevant magnetic interaction.
Abstract: We calculate the value of the Fr\"ohlich electron-phonon interaction in manganites, cuprates, and some other charge-transfer insulators and show that this interaction is much stronger than any relevant magnetic interaction. A polaron shift due to the Fr\"ohlich interaction, which is about 1 eV, suggests that carriers in those systems are small (bi)polarons at all temperatures and doping levels, in agreement with the oxygen isotope effect and other data. An opposite conclusion, recently suggested in the literature, is shown to be incorrect. The frequency and temperature dependence of the optical conductivity of ferromagnetic manganites is explained within the framework of the bipolaron theory.
2 citations
TL;DR: In this paper, the possibility of formation of a new type of polaron based on the quantum aniferromagnet (AF) model is reported, and the energy minimum is found when maximum charge density occurs on every second spin.
Abstract: The possibility of formation of a new type of polaron based on the quantum aniferromagnet (AF) model is reported. We take into account exchange interactions between localized d–d spins of the AF, as well as the p–d interaction of the AF with p-carriers. The energy minimum is found when maximum charge density occurs on every second spin. The formation of such “comb-like” polarons results from the damping of quantum fluctuations and the appearance of Van Vleck-like staggered magnetization. Such polarons tend to form pairs coupled by an AF “glue”.
2 citations
TL;DR: Based on Lee-Low-Pines (LLP) unitary transformation, the authors adopts the variational method of the Pekar type and gets the energy and wave functions of the ground state and the first excited state of strong-coupling bipolaron in two-dimensional quantum dot in electric field, thus constructs a bipolaron qubit.
Abstract: Based on Lee-Low-Pines (LLP) unitary transformation, this article adopts the variational method of the Pekar type and gets the energy and wave functions of the ground state and the first excited state of strong-coupling bipolaron in two-dimensional quantum dot in electric field, thus constructs a bipolaron qubit. The numerical results represent that the time oscillation period T
0 of probability density of the two electrons in qubit decreases with the increasing electric field intensity F and dielectric constant ratio of the medium η; the probability density Q of the two electrons in qubit oscillates periodically with the increasing time t; the probability of electron appearing near the center of the quantum dot is larger, while that appearing away from the center of the quantum dot is much smaller.
2 citations
TL;DR: In this paper, normal state resistance data from Bi 2 Sr 2 CaCu 2 O 8 single crystals were fitted to the (bi)polaronic conduction model, R = R 0 (T + σ b T 2 )/(1 + bT ), with satisfactory agreement over a wide temperature range.
Abstract: Normal-state resistance data from Bi 2 Sr 2 CaCu 2 O 8 single crystals were fitted to the (bi)polaronic conduction model, R = R 0 ( T + σ b T 2 )/(1 + bT ), with satisfactory agreement over a wide temperature range. The fluctuating conduction region is found to be much narrower than what is generally assumed in high- T c cuprates. This behavior agrees with the case for a charged Bose-gas. We estimate the effective (bi)polaron mass to be ≈ 4 m e .
2 citations