1204.1108 (David A. Ruiz-Tijerina et al.)

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

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

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.

View original: http://arxiv.org/abs/1204.1108