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Dynamical magnetic anisotropy in spin-1 molecular systems

Dynamical magnetic anisotropy in spin-1 molecular systems. D. A. Ruiz–Tijerina, P. S. Cornaglia, C. Balseiro, S. E. Ulloa. Date. Electronic transport and QPTs through molecular devices. Stretching singles out the transport axis. Induced anisotropy splits the spin-1 triplet ground state:.

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Dynamical magnetic anisotropy in spin-1 molecular systems

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  1. Dynamical magnetic anisotropy in spin-1 molecular systems • D. A. Ruiz–Tijerina, P. S. Cornaglia, C. Balseiro, S. E. Ulloa Date

  2. Electronic transport and QPTs through molecular devices • Stretching singles out the transport axis. • Induced anisotropy splits the spin-1 triplet ground state: Unitary conductance - Kondo effect Transport blockade

  3. Hamiltonian for the molecule: Model

  4. In the molecule, electron and phonon operators can be decoupled by means of a canonical transformation: When coupled to leads, this strategy becomes impractical from the hybridization to the leads But it does provide us with some insight:

  5. Because of this we expect: • A dynamically-induced splitting of the triplet. • A reduced hybridization w.r.t. the case of A1 = 0. • Anisotropic Kondo physics w/o stretching or compression. • Through a Schrieffer-Wolff transformation we obtain: spin operators of the leads can be negative, zero, positive

  6. We have more available ground states than in the static case:

  7. NRG results:spectral density and zero-bias conductance

  8. NRG results: total effective magnetic moment

  9. NRG results: total effective magnetic moment We estimate the splitting,Δ, from numerical results

  10. Focusing on the 2nd-stage-Kondo region

  11. Agreement of our model with analytic formula

  12. Conclusions • We explore QPTs by varying ANet. • Coupling to vibrations deforms the ground state into the easy-axis regime. • All effects accounted for by means of a Kondo Hamiltonian, with an a net anisotropy term. • Analytical predictions in complete agreement with NRG calculations.

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