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Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Bio- and Molecular Magnetism

MA 2.2: Vortrag

Montag, 22. März 2010, 11:00–11:15, H10

Electric quantum control of spins in molecular magnets — •Mircea Trif1, Dimitrije Stepanenko1, Filippo Troiani2, and Daniel Loss11Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — 2CNR-INFM National Research Center S3 c/o Dipartimento di Fisica via G. Campi 213/A, 41100, Modena, Italy

Single molecule magnets show clear signatures of coherent behavior. The control of the spins can allow for the quantum information processing and study of quantum dynamics. Electric fields fields are good for quantum control at the nanoscale. There are many SMMs and it is hard to predict which ones are suitable for control. Here, we provide two tools for the search for suitable SMMs. We analyze the form and mechanisms that lead to spin-electric coupling in the molecules with the shape of regular polygons. We find that the SEC in triangles is governed by the modification of the exchange interaction, while in pentagon the spin-electric coupling proceeds via spin-orbit interaction. The symmetry analysis leaves the coupling constant undetermined, and we apply a Hubbard model to single-molecule magnet to find a connection between the spin-electric coupling and the properties of the chemical bonds in a molecule. We study the experimental signatures of spin-electric coupling in the standard experiments, NMR, ESR, and thermodynamics.

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