1. Early Life and Education
2. Postdoctoral Research and Transition to IBM
3. Collaboration with Binnig and Development of the STM
4. The Scanning Tunneling Microscope
5. Significance and Recognition
6. Personal Life and Legacy

Early Life and Education

Heinrich Rohrer, a Swiss physicist and Nobel Prize laureate in Physics in 1986, was born on June 6, 1933, in Buchs, Switzerland. His father, Hans Heinrich Rohrer, was a traveling salesman for industrial goods, while his mother, Katharina (née Hanppenbein) Rohrer, was a homemaker.

Rohrer excelled in physics and chemistry during his youth, also displaying a strong aptitude for ancient languages like Latin and Greek. After high school, he initially planned to study ancient languages but later changed his mind and enrolled at the Swiss Federal Institute of Technology (ETH) in Zurich to pursue physics and mathematics. His doctoral thesis focused on pressure and volume effects in superconductivity, earning him a Ph.D. in 1960.

Postdoctoral Research and Transition to IBM

Following a year of military service, Rohrer joined Rutgers University in New Brunswick, New Jersey, for postdoctoral research on superconductivity. In 1963, he returned to Zurich and started working at the research laboratory of International Business Machines (IBM).

Collaboration with Binnig and Development of the STM

During his time at IBM, Rohrer's research interests shifted from superconductivity to other areas of solid-state physics, particularly the properties of material surfaces. Gerd Binnig, a recent graduate of the University of Frankfurt, joined Rohrer's team in 1978. Together, they developed a novel approach to surface analysis based on the quantum mechanical effect known as tunneling.

The tunneling effect arises from Heisenberg's uncertainty principle, which states that the position and momentum of a subatomic particle cannot be simultaneously known. As a result, particles like electrons behave more like diffuse "clouds" of matter, allowing them to "tunnel" or pass through two surfaces even when they are not in contact.

The Scanning Tunneling Microscope

Rohrer and Binnig's breakthrough came in the spring of 1981. Using the tunneling effect, they successfully scanned the surface of a calcium-iridium-tin crystal with a sharp probe needle. The resulting "map" revealed microscopic features with atomic-scale resolution, a significant advancement in surface analysis.

Despite technical challenges, such as isolating the experiment from noise and vibrations, Rohrer and Binnig remained optimistic. Their determination led to the development of the scanning tunneling microscope (STM), which revolutionized surface imaging.

Significance and Recognition

The STM opened up unprecedented possibilities for studying the structure of materials at the atomic level. It is now widely used in various fields, including materials science, chemistry, and biology, to investigate the properties of surfaces, interfaces, and nanostructures.

In 1986, Rohrer and Binnig were awarded the Nobel Prize in Physics "for their design of the scanning tunneling microscope." The prize committee recognized the groundbreaking nature of their invention and its potential impact on scientific research.

Personal Life and Legacy

Rohrer married Rosemarie Eggen in 1961, and they had two daughters. Known for his modesty and quiet demeanor, he once remarked, "Those who know me, understand me. For those who don't, it is useless to say anything." Rohrer passed away on May 16, 2013, leaving behind a lasting legacy in the field of nanoscience.

Physics