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Bulletin of the American Physical Society

Finite Difference Time Evolution of the Quantum Wigner Function in the Presence of a Magnetic Field

Timothy Bergstresser, TOMAS B. MATERDEY

Published Mar 18, 2009• 0 citations
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Discrete quantum phase space formalism is used to discuss some basic aspects of the spin tunneling occurring in Fe8 magnetic cluster by means of Wigner functions as well as Husimi distributions. Those functions were obtained for sharp angle states and symmetric combinations of the lowest energy doublet with the application of an external magnetic field. The time evolution of those functions carried out numerically allows one to extract valuable information about the dynamics of the states under consideration, in particular, the coherent oscillations associated with the spin tunneling. It is also shown that an entropy functional constructed out of the discrete Husimi distribution function allows to characterize the spin tunneling.