Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum gases: Bosons I
Q 12.6: Talk
Monday, March 18, 2013, 15:30–15:45, E 001
One-dimensional many-body quantum transport of Bose-Einstein condensates: a Truncated Wigner Approach — •Julien Dujardin1, Arturo Argüelles1, Alejandro Saenz2, and Peter Schlagheck1 — 1Département de Physique, Université de Liège, 4000 Liège, Belgium — 2Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
We study the transport properties of an ultracold gas of Bose-Einstein condensed atoms that is coupled from a magnetic trap into a one-dimensional waveguide. Our central motivation in the context of such guided atom lasers [1] is to explore the role of atom-atom interaction in many-body transport processes across finite scattering regions resembling tunnel junctions or quantum dots. Our theoretical approach to solve this problem is based on the Truncated Wigner Method [2] for which we assume the system to consist of two semi-infinite non-interacting leads and a finite interacting scattering region. The condensed and non-condensed fractions of the atomic density, the current, and the transmission in the steady-state regime are computed and compared with mean-field predictions as well as with numerical results obtained with the matrix-product state (MPS) method.
[1] W. Guerin et al., Phys. Rev. Lett. 97, 200402 (2006).
[2] C. W. Gardiner et al., J. Phys. B 35, 1555 (2002); A. Sinatra et al., J. Phys. B. 35, 3599 (2002) .