Bipolaron formation in the presence of magnetic impurities

Neil McCulloch, Eitan Abraham

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The formation of bipolarons in the presence of magnetic impurities is studied theoretically. We use the extended Hubbard Su-Schrieffer-Heeger (SSH) model with Brazovskii-Kirova and Kondo interaction terms. Parameters are chosen suitably for cis-polyacetylene. A Quantum Monte Carlo (QMC) algorithm is used to study the equilibrium lattice structure and charge distribution as a function of doping level and Kondo exchange integral. The magnetic impurities can have a destructive effect on bipolaron stability, instead favouring the two polaron configuration. However by suitably adjusting the doping level, bipolarons can be stabilized over a wide range of impurity strength. © 2009 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1966-1969
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume469
Issue number21
DOIs
Publication statusPublished - 1 Nov 2009

Keywords

  • Bipolaron
  • Kondo
  • Polaron
  • Polyacetylene
  • QMC
  • SSH

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