Using lasers to slow down atoms is a technique that has been used for a long time already: If one wants to achieve low-temperature world records in the range of absolute temperature zero, one resorts to laser cooling, in which energy is extracted from the atoms with a suitable laser beam.
Recently, such techniques have also been applied to small particles in the nano- and micro-metre range. This already works quite well for individual particles — but if you want to cool several particles at once, the problem turns out to be much more difficult. Prof. Stefan Rotter and his team at the…
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News Source: www.sciencedaily.com