Hamburg 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

A: Fachverband Atomphysik

A 36: Ultra-Cold Atoms, Ions and BEC V (with Q)

A 36.4: Vortrag

Freitag, 6. März 2009, 11:45–12:00, VMP 6 HS-C

Temperature gradients in superfluid Bose-Hubbard systems — •Lukas Gilz and James Anglin — Fachbereich Physik, TU Kaiserslautern, 67663 Kaiserslautern

While the interaction of Bose-Einstein-Condensates (BEC) with homogeneous thermal environments has been studied extensively, and phenomena such as condensate growth and decoherence have been well understood, little attention has been payed to the interaction of BECs with inhomogeneous environments. We examine non-equilibrium steady states of cold bosons tunneling between a finite series of potential wells, while interacting at opposite ends of the series with two distinct particle reservoirs, characterized by different temperatures and chemical potentials. We describe the coherent dynamics of the system with a Bose-Hubbard Hamiltonian, and model the interaction with the thermal reservoirs using a quantum kinetic master equation. We derive expressions for the temperature gradient and heat current in the system, in various dynamical regimes.