Klaus von Klitzing

Klaus von Klitzing (born 28 June 1943) is a German physicist best known for his discovery of the integer quantum Hall effect, a fundamental quantum phenomenon in two-dimensional electron systems subjected to strong magnetic fields and low temperatures, where the Hall resistance takes on precise quantized values that depend solely on fundamental constants. This breakthrough, published in 1980, revolutionized condensed matter physics and metrology by providing an exact standard for electrical resistance, enabling highly precise measurements of the fine-structure constant without reference to material properties. For this work, Klitzing was awarded the Nobel Prize in Physics in 1985, becoming the first and only recipient that year.

Born in Schroda (now Środa Wielkopolska, Poland), then part of Germany, Klitzing earned his Abitur in Quakenbruck in 1962 before studying physics at the Technical University of Braunschweig, where he obtained his diploma in 1969 with a thesis on lifetime measurements in indium antimonide. He then pursued his Ph.D. at the University of Würzburg, completing it in 1972 with research on the galvanomagnetic properties of tellurium in strong magnetic fields, followed by his habilitation there in 1978. Early in his career, Klitzing conducted research at the Clarendon Laboratory in Oxford (1975–1976) and the High Magnetic Field Laboratory in Grenoble (1979–1980), focusing on semiconductor physics and quantum transport phenomena.