Enhanced heat flow in the hydrodynamic-collisionless regime

Details Enhanced heat flow in the hydrodynamic-collisionless regime Enhanced heat flow in the hydrodynamic-collisionless regime

2009-08-12

arxiv.org/abs/0908.1659v1

Physics

Condensed Matter

Quantum Gases

Sumitted to Phys. Rev. Letters, 4 pages, 4 figures

Scientific paper

We study the heat conduction of a cold, thermal cloud in a highly asymmetric trap. The cloud is axially hydrodynamic, but due to the asymmetric trap radially collisionless. By locally heating the cloud we excite a thermal dipole mode and measure its oscillation frequency and damping rate. We find an unexpectedly large heat conduction compared to the homogeneous case. The enhanced heat conduction in this regime is partially caused by atoms with a high angular momentum spiraling in trajectories around the core of the cloud. Since atoms in these trajectories are almost collisionless they strongly contribute to the heat transfer. We observe a second, oscillating hydrodynamic mode, which we identify as a standing wave sound mode.

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