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DY: Fachverband Dynamik und Statistische Physik

DY 40: Poster - Quantum Systems/ Stat. Phys./ Diffusive Process

DY 40.8: Poster

Thursday, April 3, 2014, 17:00–19:00, P3

Two-level dynamics in presence of a band-gapped material — •Martin Pietsch, Denis Kast, and Joachim Ankerhold — Institut für Theoretische Physik, Universität Ulm, Albert-Einstein-Allee 11, 89069 Ulm

We studied the dynamics of a single spin that interacts with a bosonic broadband reservoir (spin boson model). The spectrum is Ohmic, but with a gap near a certain frequency. Our numerically exact Path Integral Monte Carlo simulations, including recent extensions [1,2], reveal that the spectral hole imprints its frequency onto the dynamics, thereby prohibiting the fixation of a well-defined coherent-incoherent transition point for increasing system-reservoir coupling. This investigation is motivated by impressive progress in designing photonic bandgap materials during the last years.

[1] D. Kast and J. Ankerhold, Phys. Rev. Lett. 110, 010402 (2013). [2] D. Kast and J. Ankerhold, Phys. Rev. B 87, 134301 (2013).