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TT: Fachverband Tiefe Temperaturen

TT 26: Quantum Dynamics, Decoherence and Quantum Information (jointly with DY)

TT 26.2: Vortrag

Montag, 16. März 2015, 15:15–15:30, BH-N 334

Dissipative Landau-Zener transitions with longitudinal and transversal noise — •Samaneh Javanbakht, Peter Nalbach, and Michael Thorwart — I. Institut f\"{u}r Theoretische Physik Universit\"{a}t Hamburg Jungiusstra\ss{}e 9, 20355 Hamburg

We have studied the Landau-Zener transition probability in a dissipative environment exhibiting both, longitudinal as well as transversal, noise. We employed the numerically exact quasi-adiabatic path integral as well as the approximate nonequilibrium Bloch equations. We find that transversal noise influences the Landau-Zener probability much stronger than longitudinal noise at equal temperature and system-bath coupling. Furthermore we reveal that transversal noise renormalizes the tunnel coupling independent of temperature. Finally, we observe that longitudinal and transversal noise cannot be treated independently but are correlated. This results in an unexpected dependence on the relative sign of the transversal and the longitudinal system-bath coupling.