Horst Störmer

Horst Störmer is a German physicist renowned for his experimental discovery of the fractional quantum Hall effect, a groundbreaking phenomenon in condensed matter physics. His work, conducted at the renowned Bell Labs in collaboration with Daniel Tsui and under the theoretical guidance of Robert Laughlin, revealed new states of matter where electrical conductance is quantized in fractional units. This discovery fundamentally altered the understanding of quantum mechanics in two-dimensional electron systems and earned him a share of the Nobel Prize in Physics in 1998. Störmer's career has spanned prestigious industrial research and academia, significantly advancing the field of mesoscopic physics.

Early life and education

Horst Störmer was born in Frankfurt am Main in the post-war nation of West Germany. He developed an early interest in the sciences, which led him to pursue physics at the University of Frankfurt. For his graduate studies, he moved to the University of Stuttgart, where he completed his doctorate in 1977 under the supervision of Hans-Joachim Queisser. His doctoral research focused on the optical properties of semiconductors, laying a crucial experimental foundation for his future work. Following his PhD, Störmer was awarded a fellowship that brought him to the United States to conduct postdoctoral research at the famed Bell Laboratories in New Jersey.

Career and research

Störmer's association with Bell Labs proved to be the defining period of his scientific career, as he joined the institution as a permanent staff member in 1978. At Bell Labs, a historic hub for innovation that also nurtured figures like John Bardeen and Arno Penzias, Störmer worked within the forefront of solid-state physics research. He specialized in studying the behavior of electrons confined in extremely pure semiconductor structures, particularly those made from materials like gallium arsenide. His experimental expertise in molecular-beam epitaxy and low-temperature physics allowed him to probe the quantum world with unprecedented precision. In 1997, he transitioned to academia, becoming a professor of physics and applied physics at Columbia University and an adjunct director at Lucent Technologies' research division.

Discovery of the fractional quantum Hall effect

The pivotal discovery occurred in 1982 while Störmer and his colleague Daniel Tsui were conducting experiments at the ultra-low temperatures and high magnetic fields available at Bell Labs. They were investigating the integer quantum Hall effect, a phenomenon discovered earlier by Klaus von Klitzing. In their meticulous measurements on a two-dimensional electron gas in a gallium arsenide heterostructure, they observed plateaus in the Hall conductance at fractional values of the fundamental constant e²/h. This unexpected result, the fractional quantum Hall effect, defied existing theoretical models. The theoretical explanation was soon provided by Robert Laughlin, who described the new state as a quantum fluid of electrons where excitations carried fractional charges. This trio's work unveiled the new physics of topological order and anyons.

Awards and honors

For the discovery of the fractional quantum Hall effect, Störmer received the highest scientific accolades. In 1998, he was awarded the Nobel Prize in Physics jointly with Daniel Tsui and Robert Laughlin. His earlier honors included the prestigious Oliver E. Buckley Condensed Matter Prize of the American Physical Society in 1984. He is also a recipient of the Franklin Institute's Benjamin Franklin Medal and the German Physical Society's Robert Wichard Pohl Prize. Störmer is an elected member of several esteemed academies, including the United States National Academy of Sciences, the American Academy of Arts and Sciences, and the German Academy of Sciences Leopoldina.

Personal life

Horst Störmer has maintained a private personal life alongside his distinguished public career. He became a naturalized citizen of the United States following his long residency and scientific work there. He is married and has two children. Since his retirement from active research and teaching at Columbia University, he has continued to reside in the United States. Störmer is also known for his engagement in scientific outreach, often speaking about the importance of fundamental research and the unexpected paths to major discovery.

Category:German physicists Category:Nobel laureates in Physics Category:Bell Labs people Category:Columbia University faculty Category:1949 births Category:Living people