Eldar Salayev

1933 - 2022

Eldar Salayev (1933–2022): Architect of Azerbaijani Semiconductor Physics

Eldar Yunis oglu Salayev was a towering figure in the scientific landscape of Azerbaijan and the broader Soviet physics community. As a physicist, academician, and long-serving President of the Azerbaijan National Academy of Sciences (ANAS), Salayev bridged the gap between fundamental quantum theory and practical applications in infrared technology and laser physics. His leadership during the transition from the Soviet era to Azerbaijani independence ensured the survival and modernization of the nation’s scientific infrastructure.

1. Biography: Early Life and Career Trajectory

Eldar Salayev was born on December 31, 1933, in the historic city of Nakhchivan, Azerbaijan. His academic journey began at Azerbaijan State University (now Baku State University), where he graduated from the Faculty of Physics in 1956.

His career trajectory was marked by a steady ascent through the Soviet academic hierarchy:

Early Research (1960s): He pursued postgraduate studies at the prestigious Ioffe Physical-Technical Institute in Leningrad (St. Petersburg), a global hub for semiconductor research. He earned his Candidate of Physical and Mathematical Sciences degree in 1963.
Doctoral Success (1970s): In 1975, he defended his doctoral dissertation, becoming a Doctor of Physical and Mathematical Sciences.
Leadership (1983–1997): Salayev served as the President of the Azerbaijan Academy of Sciences for 14 years. This period was perhaps the most challenging in the institution's history, encompassing the collapse of the USSR and the early years of Azerbaijani independence.
Institutional Building: He served as the Director of the Institute of Physics and founded the Special Design Bureau "Cybernetics," which focused on translating theoretical physics into industrial and military hardware.

Salayev passed away on June 20, 2022, in Baku, leaving behind a legacy as one of the most influential Azerbaijani scientists of the 20th century.

2. Major Contributions: Semiconductors and Quantum Electronics

Salayev’s primary scientific contribution lies in the physics of layered semiconductors (specifically A^IIIB^VI type compounds like Gallium Selenide, GaSe, and Gallium Sulfide, GaS).

Anisotropy and Layered Structures: Salayev was a pioneer in studying how the physical properties of crystals change based on their direction (anisotropy). Because layered semiconductors have weak Van der Waals forces between layers, they possess unique optical and electrical properties. Salayev’s work provided the mathematical and experimental framework for understanding these materials.
Photo-electronics and Infrared Technology: He led the development of high-sensitivity photo-detectors operating in the infrared spectrum. These devices were critical for night-vision technology, thermal imaging, and remote sensing.
Nonlinear Optics: Salayev explored the interaction of high-intensity laser light with matter. He contributed to the development of frequency converters—devices that can change the color (wavelength) of laser light, which is essential for medical lasers and telecommunications.
Quantum Electronics: He was instrumental in creating the first semiconductor lasers in Azerbaijan, focusing on their stability and efficiency at various temperature ranges.

3. Notable Publications

Salayev authored over 400 scientific papers and held more than 40 patents (Invention Certificates). While much of his early work was published in Russian-language Soviet journals, his influence reached the international stage through translations and collaborative volumes.

Electronic Properties of Layered Semiconductors (Multiple Papers): His exhaustive studies on the energy band structures of GaSe and GaS remain foundational.
Physics of A^IIIB^VI Compounds (Monograph): A comprehensive look at the group of semiconductors he spent his life studying.
Photo-electric Converters (1970s-80s): A series of technical works detailing the construction of detectors for the infrared range.
Patents: His inventions include "Methods for manufacturing semiconductor photo-detectors" and "Laser-based measuring devices for geological surveying."

4. Awards & Recognition

Salayev’s contributions were recognized by both the Soviet Union and the Republic of Azerbaijan:

State Prize of the Azerbaijan SSR (1972): Awarded for his breakthroughs in the physics of layered semiconductors.
Order of the Red Banner of Labour: A high Soviet civilian honor for his contributions to science and industry.
Shohrat Order (Order of Glory): Awarded by the President of Azerbaijan for his services to the development of national science.
Academician of ANAS: Elected as a full member of the Academy in 1983.
Vavilov Gold Medal: Awarded for his contributions to the field of optics.

5. Impact & Legacy

Salayev’s legacy is twofold: scientific and institutional.

Scientific Impact: He established the "Baku School" of semiconductor physics. His research into layered crystals anticipated the current global interest in 2D materials (like graphene and transition metal dichalcogenides). Modern researchers in nanotechnology frequently cite the fundamental studies conducted by Salayev’s team on the electronic properties of thin-layer crystals.

Institutional Impact: As President of the Academy of Sciences during the 1990s, he prevented the total disintegration of Azerbaijan's scientific community during a time of extreme economic hardship. He championed the idea that science must remain a state priority for a nation to be truly independent.

6. Collaborations

Salayev was a bridge-builder between Baku and the great scientific centers of the world:

The Lebedev Physical Institute (FIAN): He maintained close ties with Nobel laureates such as Nikolay Basov and Alexander Prokhorov (the co-inventors of the laser), collaborating on quantum electronics research.
The Ioffe Institute: He worked with researchers in Leningrad to standardize semiconductor manufacturing processes across the Soviet Union.
Mentorship: Salayev supervised over 40 PhD and Doctor of Science candidates, many of whom now lead research departments in Europe, the United States, and Turkey.

7. Lesser-Known Facts

Space Exploration: Salayev’s infrared sensors were used in the Soviet space program. His work helped equip satellites and orbital stations with the "eyes" necessary to map the Earth's surface and monitor atmospheric conditions.
Defense Contributions: During the Cold War, his laboratory was involved in highly classified projects related to laser-guided systems and infrared countermeasures for the Soviet military.
A Renaissance Man: Despite being a "hard" scientist, Salayev was known for his deep appreciation of Azerbaijani literature and history, often arguing that a true scientist must be grounded in the humanities to understand the ethical implications of their work.
Resilience in Crisis: During the early 1990s, when the Academy's funding was nearly non-existent, Salayev reportedly used his personal influence and connections to secure international grants and industrial partnerships to keep the laboratories running and the young scientists fed.