Dynamical magnetic anisotropy and quantum phase transitions in a vibrating spin-1 molecular junction

David Ruiz-Tijerina, Pablo S. Cornaglia, Carlos A. Balseiro, Sergio E. Ulloa

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We study the electronic transport through a spin-1 molecule in which mechanical stretching produces a magnetic anisotropy. In this type of device, a vibron mode along the stretching axis will couple naturally to the molecular spin. We consider a single molecular vibrational mode and find that the electron-vibron interaction induces an effective correction to the magnetic anisotropy that shifts the ground state of the device toward a non-Fermi-liquid phase. A transition into a Fermi-liquid phase could then be achieved, by means of mechanical stretching, passing through an underscreened spin-1 Kondo regime. We present numerical renormalization-group results for the differential conductance, the spectral density, and the magnetic susceptibility across the transition.
    Original languageEnglish
    Article number035437
    JournalPhysical Review B: covering condensed matter and materials physics
    Volume86
    Issue number3
    DOIs
    Publication statusPublished - 23 Jul 2012

    Keywords

    • Kondo effect
    • Quantum phase transitions
    • Molecular junctions

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