September 28, 2009
Pushing The Cold Frontier In An Orderly Fashion
Rather than reducing disorder, physicists find a way to simply move it somewhere else
Physicists are continually reaching new lows as they reduce the temperatures of samples in their laboratories. But even nano-kelvins are not low enough to overcome the entropy (a measure of the disorder in a system) that stands between them and the discovery of exotic states of ultra-cold matter. Now physicists at two Italian universities have developed a technique that siphons entropy out of a collection of atoms in much the same way that a kitchen refrigerator removes heat from the food stored inside. The new method is described in Physical Review Letters and highlighted in the September 28 issue of Physics.
The novel technique should work with other combinations of atoms as well, offering researchers a new tool to aid them in their pursuit of physics at ultra-low temperatures and entropies.
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