Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.3: Poster

Tuesday, March 9, 2010, 16:00–19:00, Lichthof

Second Josephson oscillations — •Martin P. Strzys and James R. Anglin — Technische Universität Kaiserslautern, FB Physik, 67663 Kaiserslautern, Germany

A four-mode Bose-Hubbard model with two highly differing tunneling rates is considered as a model for two quantum systems in thermal contact. In addition to coherent particle exchange a novel slow second Josephson mode, which is not predicted by linear Bogoliubov theory, can be identified by a series of Holstein-Primakoff transformations. This energy exchange mode can be interpreted as heat exchange between the subsystems, is in close analogy to second sound in liquid helium, and may shed light on the emergence of thermodynamics in mesoscopic systems.