Prof. Dr. Klaus von Klitzing, the director of the Max Planck Institute for Solid State Research in Stuttgart, is also well known for the discovery of the Integer Quantum Hall Effect, for which he was awarded the Nobel Prize in Physics in 1985. He visited AIST on January 29th and 30th and gave a lecture on 30th titled “Fundamental Constants: The basis for a New SI”.
The quantized Hall resistance is used for the primary standards of electrical resistance in many developed countries nowadays. In his lecture, not only did he explain the quantum Hall effect from his many years research but also how the surrounding physics has contributed to the SI units and will have an effect to SI redefinition. The talk included NMIJ’s activities and contributions to the SI and dissemination of the units to industry.
He also visited research laboratories of Electricity and Magnetism Division, Temperature and Humidity Division Material Properties Division and Time and Frequency Division. He and NMIJ researchers enjoyed discussion for many hours on the research and development of the quantum Hall effect resistance standard, the single electron pump, the Josephson effect voltage standard, the Johnson noise thermometry, the laser interferometer that measures the shape of silicon spheres (International Avogadro Project) and the ytterbium and strontium optical lattice clocks and so forth.