Long-range electron-phonon interactions lead to superlight small bipolarons

Hague, J. P.; Kornilovitch, P. E.; Samson, J. H. and Alexandrov, A. S. (2007). Long-range electron-phonon interactions lead to superlight small bipolarons. Journal of Physics: Conference Series, 92 012118.

DOI: https://doi.org/10.1088/1742-6596/92/1/012118


A finite-range Fröhlich electron-phonon interaction (EPI) with c-axis polarized optical phonons has been identified in cuprate superconductors by photoemission spectroscopy, in agreement with an earlier proposal by Alexandrov and Kornilovitch [1]. In this article, we discuss the consequences of long-range interactions on phonon-mediated local pairing. First, we examine the effects of modifying interaction range and lattice geometries with regard to analytical strong-coupling/non-adiabatic results for ladder systems. To test the applicability of the analytic results to experimentally achievable couplings and phonon frequencies, we apply a continuous time quantum Monte-Carlo algorithm (CTQMC) to the computation of the effective mass and pairing radius of lattice bipolarons. We demonstrate that bipolarons can be simultaneously small and light due to a novel crab-like motion. Such light, small bipolarons are a necessary precursor to high-temperature Bose-Einstein condensation in solids.

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