Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 40: Electronic Structure of Magnetism, Micromagnetism, Computational Magnetism (organized by MA)

TT 40.4: Talk

Tuesday, March 17, 2015, 10:15–10:30, H 0112

Non-harmonic quantum dynamics of single spin systems — •Mario Krizanac, David Altwein, Elena Vedmedenko, and Roland Wiesendanger — Institute of Applied Physics and Interdisciplinary Nanoscience Center Hamburg , Germany

The time evolution of single quantum spins became accessible to the experimental observation in the last years [J. Phys. D:Appl. Phys.44(2011)]. Therefore, it was our motivation to study the dynamics of single quantum spin systems with uniaxial anisotropy in an external magnetic Bz-field from a theoretical perspective within the Schroedinger formalism. It has been found that the spin dynamics shows a very complicated non-harmonic periodicity. The period depends on the ratio of the external magnetic Bz-field and the uniaxial anisotropy in Sz direction. We observed two cases, the first one of very high periodicity and a second one of low periodicity. The conditions for these cases can be formulated in the form of a simple equation, which can be easily generalized to describe these conditions for single quantum spin systems of any size.

Atomic magnetism revealed by spin-resolved scanning tunnelling spectroscopy [J. Phys. D: Appl. Phys.44(2011)] Jens Wiebe, Lihui Zhou and Roland Wiesendanger Institute of Applied Physics, Hamburg University, Jungiusstrasse 11, D-20355 Hamburg, Germany