Multiphoton antiresonance in large-spin systems

Abstract

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.

Submitted to PRB

References in corpus (5)

• Thermally Activated Resonant Magnetization Tunneling in Molecular Magnets: Mn_12Ac and others
• Resonant Tunneling in Truly Axial Symmetry Mn12 Single-Molecule Magnets: Sharp Crossover between Thermally Assisted and Pure Quantum Tunneling
• Oscillatory Tunnel Splittings in Spin Systems: A Discrete Wentzel-Kramers-Brillouin Approach
• Multiphoton antiresonance
• Bohr-Sommerfeld quantization of spin Hamiltonians

Cited by in corpus (5)

• Multiphoton coherent manipulation in large-spin qubits
• Quasienergy description of the driven Jaynes-Cummings model
• Tunable multi-photon Rabi oscillations in an electronic spin system
• Forbidden coherent transfer observed between two realizations of quasi-harmonic spin system
• Resonant single and multi-photon coherent transitions in a detuned regime