Density Matrix Equation for a Bathed Small System and its Application to Molecular Magnets

Understand

The technique of density matrix equation (DME) for a small system interacting with a bath is explained in detail.

• Special attention is given to the nonsecular DME that is needed in the vicinity of overdamped tunnelling resonances in molecular magnets (MM).
• The relaxation terms of the DME for MM are represented in the universal form that does not employ any unknown spin-lattice coupling constants and absorbs the information about the spin Hamiltonian in the exact basis states and transition frequencies.
• This makes adding new types of anisotropy easy and error-free.