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TT: Fachverband Tiefe Temperaturen

TT 12: Quantum Dynamics, Decoherence and Quantum Information (organized by DY)

TT 12.4: Vortrag

Montag, 31. März 2014, 10:30–10:45, HÜL 186

Coherence phase diagram and a quench dynamics of a spin-boson model. — •Oleksiy Kashuba¹, D.M. Kennes², M. Pletyukhov², V. Meden², and H. Schoeller² — ¹Institut für Theoretischen Physik, Technische Universität Dresden — ²Institut für Theorie der Statistischen Physik, RWTH Aachen

We study the non-Markovian dynamics of the small dissipative quantum system coupled to an thermodynamically equilibrated environment. The memory effects probed by the quenching of the coupling strength. We discovered the contra-intuinive tendency of the system to the enhancement of the coherence in response to stronger memory of the incoherent behaviour before the quench. Studying the dynamics of the system at different coupling and temperatures we revealed several distinct "phases" by discriminating between the dynamics on intermediate and long time scales. Surprisingly, elevated temperature can render the system "more coherent" by inducing a transition from the partially coherent to the coherent regime.