Brian Josephson
DOI: 10.1063/PT.5.031125
On this date in 1940, Nobel laureate Brian Josephson was born in Cardiff, Wales. As a PhD student at Cambridge, Josephson predicted that a current that flows indefinitely without any additional voltage applied would be possible across two superconductors coupled by a weak link through quantum tunnelling. This effect, which now bears his name, earned Josephson the 1973 Nobel Prize in Physics, which he shared with Leo Esaki and Ivar Giaever for their own work on quantum tunnelling.
Date in History: 4 January 1940