Scanning-electron-microscope image of part of the SQUID device used to measure the thermal Josephson effect.
(Courtesy: Francesco Giazotto and María José Martínez-Pérez)

Heat flows ‘backwards’ across Josephson junction

Jan 7, 2013

The thermal Josephson effect, which occurs when heat is transported across a gap between two superconductors, has been measured in the lab for the first time. The experiment was done by two physicists in Italy and confirms a theoretical prediction made in 1965. As well as confirming the bizarre prediction that some heat flows from the cold side of the junction to the hot side, the breakthrough could further the development of thermal circuits that use heat in much the same way as charge is used in electronic devices.

Read more: Heat flows 'backwards' across Josephson junction – physics world.

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