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DY: Fachverband Dynamik und Statistische Physik

DY 6: Statistical Physics far from Thermal Equilibrium - Part II

DY 6.5: Vortrag

Montag, 31. März 2014, 16:15–16:30, ZEU 160

Quantum critical temperature of a modulated oscillator — Lingzhen Guo¹, Vittorio Peano², •Michael Marthaler¹, and Mark Dykman³ — ¹Institut für Theoretische Festkörperphysik, KIT, Karlsruhe — ²Institute for Theoretical Physics II, University of Erlangen-Nuremberg, Erlangen — ³Department of Physics,Department of Physics and Astronomy, Michigan State University, East Lansing

We show that the rate of switching between the vibrational states of a modulated nonlinear oscillator is characterized by a quantum critical temperature T_c∝ ℏ² . The rate is independent of T for T<T_c. Above T_c there emerges a quantum crossover region where the slope of the logarithm of the distribution over the oscillator states displays a kink and the switching rate has the Arrhenius form with the activation energy independent of the modulation. The results demonstrate the limitations of the real-time instanton theory of switching in systems lacking detailed balance.