Düsseldorf 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Fachverband Atomphysik
A 1: Quantengase (jointly with Q)
A 1.1: Vortrag
Montag, 19. März 2007, 10:30–10:45, 6J
Interference of one-dimensional quasi-condensates — •Sebastian Hofferberth1, Igor Lesanovsky2, Stephanie Manz1, Thorsten Schumm1, and Jörg Schmiedmayer1 — 1Atominstitut der Österreichischen Universitäten, TU-Wien, Stadionallee 2, A-1020 Vienna, Austria — 2Universität Innsbruck, Institute for Quantum Optics and Quantum Information, A-6020 Innsbruck, Austria
Phase fluctuations play an important role in one-dimensional systems, preventing true long range phase order even at zero temperature. We study the thermal phase fluctuations in a one-dimensional Bose gas by coherently splitting a single quasi-condensate and observing interference between the two resulting matter wave packets.
Our interferometer scheme is based on radio-frequency induced adiabatic potentials implemented on an atom chip, which allows us to prepare two quasi-condensates with a defined macroscopic relative phase [1] . The phase fluctuations lead to an intrinsic dephasing over time, which can be extracted from the observed interference patterns [2].
We study the dependence of the dephasing time on the density in the quasi-condensates and the trap parameters. Additionally we investigate how a finite tunnel-coupling between the two systems affects the dynamics of the relative phase.
[1] S. Hofferberth, I. Lesanovsky, B. Fischer, J. Verdu and J. Schmiedmayer, Nature Phys. 2, 710 (2006) [2] V. Gritsev, E. Altman, E. Demler and A. Polkovnikov, Nature Phys. 2, 705 (2006)