Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 39: Transport: Quantum Coherence and Quantum Information Systems - Theory II

TT 39.8: Vortrag

Dienstag, 1. April 2014, 12:30–12:45, BEY 81

Master equation approach for the description of the dynamics of an holmium atom on Pt(111) — •Christian Karlewski, Michael Marthaler, and Gerd Schön — Institut für Theoretische Festkörperphysik, KIT, 76128 Karlsruhe

We model a holmium atom located on a Pt(111) surface. This system was recently studied experimentally (Nature 503, 242 (2013)). Transitions between the two degenerated ground states are forbidden in first order due to several symmetries (time-reversal, internal symmetries of the total angular momentum, point symmetry of the local environment) yielding long life times. We simulate the dynamics of the whole set of 17 eigenstates (J=8) of the Ho-atom coupled to an environment with a master equation approach. To check the validity of our model it is compared to an experiment in which the system is driven out of equilibrium by a current and relaxes afterwards to one of the two degenerate ground states.