Prof. David Weiss – Pennsylvania State University
“How to and why make a one-dimensional gas”
Abstract: I will explain the physics of 1D Bose gases, and describe experiments that confirm the longstanding exact theory. I will then describe how we create quantum Newton’s cradles, a more perfect version of the well-known momentum lecture demonstration. We observe negligible approach to equilibrium even after each atom in the 1D gas has undergone thousands of collisions. That is, the motion never becomes chaotic. We show experimentally that even a slight relaxation of certain criteria that make the gas one-dimensional allows it to thermally equilibrate.
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