Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-01-24
Phys. Rev. Lett. 106, 250602 (2011)
Physics
Condensed Matter
Quantum Gases
4 pages, 4 figures plus supplementary material (2 pages, 1 figure), published version
Scientific paper
10.1103/PhysRevLett.106.250602
We consider a cloud of fermionic atoms in an optical lattice described by a Hubbard model with an additional linear potential. While homogeneous interacting systems mainly show damped Bloch oscillations and heating, a finite cloud behaves differently: It expands symmetrically such that gains of potential energy at the top are compensated by losses at the bottom. Interactions stabilize the necessary heat currents by inducing gradients of the inverse temperature 1/T, with T<0 at the bottom of the cloud. An analytic solution of hydrodynamic equations shows that the width of the cloud increases with t^(1/3) for long times consistent with results from our Boltzmann simulations.
Mandt Stephan
Rapp Akos
Rosch Achim
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