Art view of a semiconductor InAs/GaAs quantum dot (In, Ga and As respectively in yellow, blue and purple). Two remote nuclear spins (yellow arrows) are coupled via the spin of an electron delocalized over the quantum dot (red). (Image: University of Basel, Department of Physics)
For the first time, researchers at the University of Basel have coupled the nuclear spins of distant atoms using just a single electron. Three research groups from the Department of Physics took part in this complex experiment, the results of which have now been published Nanotechnology. In most materials, the nuclear spins of neighboring atoms have only a very weak effect on one another, as the tiny nuclei are located deep within the atoms. This is not the case in metals, however, where some of the electrons are able to move freely. The electron spins are able to couple nuclear spins at relatively large distances from one another. Named after four physicists, this RKKY interaction was discovered in the 1950s. Nuclear spins linked by an individual electron spin.
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