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

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

2008-05-05

arxiv.org/abs/0805.0391v1

Advances in Chemical Physics, edited by S. A. Rice and A. R. Dinner (John Wiley & Sons, Inc., Hoboken, NJ, USA, 2011), vol. 14

Physics

Condensed Matter

Statistical Mechanics

47 one-column PRE-style pages, 7 figures

Scientific paper

10.1002/9781118135242.ch4

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. The Mathematica code is available from the author.

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