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Heinrich Rohrer

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Heinrich Rohrer was a highly influential Swiss physicist. He spent his career exploring the fundamental properties of the physical world. Rohrer is most famous for his work in microscopy. Specifically, he helped design the scanning tunneling microscope, known as the STM. This device allowed scientists to see and interact with matter at the atomic level. His invention fundamentally changed the field of nanotechnology and surface science.

The STM works by using a very sharp probe to scan a surface. This process relies on a phenomenon called quantum tunneling. In the STM, a tiny tip moves incredibly close to a sample. An electrical current flows between the tip and the surface. This current happens because electrons can "tunnel" through a small gap. By measuring this current, the microscope can map the tiny bumps and shapes of atoms. This mechanism allows for a level of detail that light microscopes cannot achieve.

Rohrer's journey in physics began in Switzerland. He was born in Buchs, St. Gallen, on June 6, 1933. He grew up in the countryside before moving to Zürich in 1949. In 1951, he enrolled at the Swiss Federal Institute of Technology, also known as ETH. There, he studied under famous scientists like Wolfgang Pauli and Paul Scherrer. His early research involved cryogenic engineering, which is the study of very low temperatures. He specifically measured how superconductors change length during a magnetic-field-induced transition.

During his doctoral studies, Rohrer learned the importance of precision. His measurements were extremely sensitive to any movement. Even the tiny vibrations of a city could ruin his data. To solve this, he conducted most of his research at night. He waited until the city was asleep to ensure a quiet environment. This discipline helped him master the delicate nature of experimental physics. His studies were later interrupted by his service in the Swiss mountain infantry.

In 1963, Rohrer joined the IBM Research Laboratory in Rüschlikon. He worked under the direction of Ambros Speiser. His early years at IBM involved studying Kondo systems. These systems involve how magnetic impurities affect the electrical resistance of metals. He also studied magnetic phase diagrams and critical phenomena. In 1974, he took a sabbatical year at the University of California, Santa Barbara. During this time, he studied nuclear magnetic resonance with researchers Vince Jaccarino and Alan King.

Rohrer's most significant achievement arrived in the mid-1980s. He worked on the development of the STM until 1982. For this work, he was awarded the Nobel Prize in Physics in 1986. He shared the prize with Gerd Binnig, who co-designed the microscope. The third recipient of the prize was Ernst Ruska. In 1986, Rohrer was also appointed as an IBM Fellow. He served as the leader of the physics department at IBM from 1986 to 1988.

Today, Rohrer's legacy is honored through several scientific channels. The Heinrich Rohrer Medal is awarded every three years. This medal is presented by the Surface Science Society of Japan. IBM Research – Zurich and the Swiss Embassy in Japan also participate. Ms. Rohrer also helps present the medal in his memory. This award recognizes excellence in the field he helped build. Rohrer passed away at his home in Wollerau, Switzerland, in 2013 at the age of 79.

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