Bipolaron formation in the presence of magnetic impurities

Neil McCulloch; Eitan Abraham

doi:10.1016/j.physc.2009.07.005

Bipolaron formation in the presence of magnetic impurities

Neil McCulloch, Eitan Abraham

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

2 Citations (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 language	English
Pages (from-to)	1966-1969
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	469
Issue number	21
DOIs	https://doi.org/10.1016/j.physc.2009.07.005
Publication status	Published - 1 Nov 2009

Keywords

Bipolaron
Kondo
Polaron
Polyacetylene
QMC
SSH

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10.1016/j.physc.2009.07.005

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title = "Bipolaron formation in the presence of magnetic impurities",

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. {\textcopyright} 2009 Elsevier B.V. All rights reserved.",

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AU - McCulloch, Neil

AU - Abraham, Eitan

PY - 2009/11/1

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N2 - 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.

AB - 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.

KW - Bipolaron

KW - Kondo

KW - Polaron

KW - Polyacetylene

KW - QMC

KW - SSH

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DO - 10.1016/j.physc.2009.07.005

M3 - Article

SN - 0921-4534

VL - 469

SP - 1966

EP - 1969

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 21

ER -

Bipolaron formation in the presence of magnetic impurities

Abstract

Keywords

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