Multiphoton antiresonance in large-spin systems

Details Multiphoton antiresonance in large-spin systems Multiphoton antiresonance in large-spin systems

2007-07-13

arxiv.org/abs/0707.2107v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to PRB

Scientific paper

10.1103/PhysRevB.76.054436

We study nonlinear response of a spin $S>1/2$ with easy-axis anisotropy. The response displays sharp dips or peaks when the modulation frequency is adiabatically swept through multiphoton resonance. The effect is a consequence of a special symmetry of the spin dynamics in a magnetic field for the anisotropy energy $\propto S_z^2$. The occurrence of the dips or peaks is determined by the spin state. Their shape strongly depends on the modulation amplitude. Higher-order anisotropy breaks the symmetry, leading to sharp steps in the response as function of frequency. The results bear on the dynamics of molecular magnets in a static magnetic field.

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