Exploring the behavior of a gas as it transitions between quantum and classical states

phys.org | 3/15/2019 | Staff
eymira (Posted by) Level 3
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A team of researchers from the MIT-Harvard Center for Ultracold Atoms has developed a way to study and measure gases as they transition between quantum and classical states due to changes in temperature. In their paper published in the journal Physical Review Letters, the group describes experiments they carried out with clouds of lithium-6 atoms and what they found.

Boltzmann gases are made up of particles with negligible volume and perfectly elastic collisions—they are described, naturally enough, by Boltzmann's kinetic theory. In such a gas, particles move around in random fashion and frequently collide. Prior research has shown that if a Boltzmann gas is cooled sufficiently, it undergoes a transformation so radical that it can only be described in quantum terms. Furthermore, if the particles that make up the gas are fermions, the result can be described using Fermi liquid theory. Notably, the process can move in either direction. In this new effort, the researchers have developed a way to monitor and measure the changes that occur as the gas transitions between a quantum state and a classic one.

Order - Transition - Researchers - Quasiparticles - Way

In order to study the transition, the researchers used quasiparticles as a way to measure the properties of the...
(Excerpt) Read more at: phys.org
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