Laser refrigerator cools to 4 degrees above absolute zero
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Koji Usami holding the semiconductor nanomembrane inside its holder
Koji Usami is working in the Quantop laboratories at the Niels Bohr Institute (Photo: Ola J. Joensen/Niels Bohr Institute)
Researchers have succeeded in using a new form of laser cooling to chill a semiconducting membrane to four degrees above absolute zero - the temperature of liquid helium
Article Summary
Researchers at the Niels Bohr Institute have succeeded in using a new form of laser cooling method to cool a two and a half square millimeter semiconducting gallium arsenide (GaAs) membrane with a thickness of 160 nm from room temperature to four degrees above absolute zero - the temperature of liquid helium.
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