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Effect of electron-phonon interaction and external magnetic field on the bound state in the Anderson-Holstein model: an improved variational treatment

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Abstract

The single-impurity Anderson-Holstein model is investigated in the presence of a magnetic field by an improved variational method. The phonon degrees of freedom are first eliminated by a modified Lang-Firsov transformation followed by a zero-phonon averaging. The resulting Hamiltonian is then treated by a cluster variational method to study the effects of the electron-phonon interaction and the magnetic field on the ground state energy, local magnetic moment and the binding energy between the magnetic impurity and the conduction electrons.

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Authors and Affiliations

  1. School of Physics, University of Hyderabad, 500046, Hyderabad, India

    Ch. Narasimha Raju & Ashok Chatterjee

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  1. Ch. Narasimha Raju
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  2. Ashok Chatterjee
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Correspondence to Ashok Chatterjee.

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Narasimha Raju, C., Chatterjee, A. Effect of electron-phonon interaction and external magnetic field on the bound state in the Anderson-Holstein model: an improved variational treatment. Eur. Phys. J. B 88, 108 (2015). https://doi.org/10.1140/epjb/e2015-50528-5

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  • DOI: https://doi.org/10.1140/epjb/e2015-50528-5

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