Khakhor Pattakhovich Abdurakhmanov

	Full Name:	Qaxxor Pattakhovich Abdurakhmanov
	Date of Birth:	May 8, 1941
	Place of Birth:	Tashkent
	Academic Title:	Doctor of Physical and Mathematical Sciences, Professor
	Education:	Tashkent State University, 1960–1966
	Field:	Theoretical Physics
	Specialization:	Physics

   **Qaxxor Pattakhovich Abdurakhmanov** is Doctor of Physical and Mathematical Sciences, Professor. He is a recipient of the “Labor Glory” Order, the “For Faithful Services” Order, the “Master of His Profession” badge, the First Class “Honored Worker of Labor” chest badge, and the medal commemorating the 25th anniversary of the Constitution of the Republic of Uzbekistan. He is one of the eminent scientists, respected teachers, caring leaders, and sincere individuals who made a significant contribution to the development of physics, addressing theoretical and practical challenges in national science and higher education, and training scientific‑pedagogical specialists.
   **Qaxxor Pattakhovich Abdurakhmanov** was born on May 8, 1941, in a working‑class family in Tashkent. From 1948 to 1958 he studied at Secondary School No. 1 in Tashkent. He began his labor activity at the Tashkent transport machinery plant, working as a lathe toolmaker. As a 2nd‑class lathe machinist, he worked in this role for two years.
   From 1960 to 1966 he studied at the Department of Theoretical Physics, Faculty of Physics, Tashkent State University (now Uzbekistan National University).
In 1966, Abdurakhmanov successfully defended his diploma thesis in the field of semiconductor physics and was invited to work as a junior specialist at the Department of Theoretical Physics.
From 1966 to 1971 he was a postgraduate researcher and doctoral candidate at Tashkent State University. His internship (1966–1968) took place at the Semiconductor Institute of the USSR Academy of Sciences in Leningrad, and from 1968 to 1971 he was a postgraduate at the Laboratory of Diffusion Processes, Leningrad Institute of Physics and Technology of the USSR Academy of Sciences.
From 1971 to 1981, he held positions as Junior Researcher, Senior Researcher, and Head of the Semiconductor Physics Problem Laboratory at Tashkent State University.
From 1978 to 1981, he served as Senior Lecturer in the Department of Semiconductor and Dielectric Physics at Tashkent State University.
From 1981 to 1987, he was Head of the Semiconductor Laboratory at the Institute of Applied Physics under Tashkent State University.
From 1987 to 1991, he served as Deputy Director for Scientific Affairs at the Institute of Applied Physics.
From 1991 to 1995, he headed the Semiconductor Laboratory at the same applied physics institute.
From 1995 to 2002, he served as Director of the “MELMA” state small enterprise — the Microelectronics and Special Instruments Scientific Production Center under the Committee for Science and Technology and the Ministry of Internal Affairs of Uzbekistan.
In December 2002, Q.P. Abdurakhmanov was appointed Head of the Department of Physics at Tashkent University of Information Technologies through a competitive selection. From 2012 until October 28, 2016, he worked as Professor of the Physics Department. In 2016–2017 he served as Acting Head of the Department, and since October 15, 2017, he has been a Professor in the Department of Physics.

At the TATU ceremony honoring academic achievements

   Q.P. Abdurakhmanov began his scientific career while he was a 3rd‑year student in the Department of Theoretical Physics. In 1964 he was sent on a scientific trip to the “Pulsar” Scientific‑Production Association in Moscow to master tunnel diode technology.
In 1965, as a 5th‑year student, he was again dispatched—this time to the Moscow Electronic‑Technology Scientific Production Association and the X. Pigelman Radiotechnical Plant in Tallinn—to develop theoretical and production technologies for silicon‑based integrated circuit elements. The work conducted during these trips formed the basis for a major contract report for the Department of Theoretical Physics and for his diploma thesis.
From 1968 to 1981, he conducted theoretical and experimental research on the density distribution of quantum states near the conduction and valence bands in gallium arsenide and silicon. Q.P. Abdurakhmanov is a founder of the tunneling spectroscopy method. He was the first in the world to experimentally observe the small subgap volt‑ampere characteristics of metal‑semiconductor tunnel structures and Josephson contacts at very low temperatures (1–4.2 K). He developed technology for fabricating ideal metal‑semiconductor (M–S) tunnel contacts based on gallium arsenide and silicon.
Based on analysis of electron tunneling in metal–semiconductor contacts, he was the first to experimentally determine properties of quantum state density distribution near band edges in n‑ and p‑type GaAs and Si semiconductors, the formation and addition kinetics of impurity energy bands to the conduction band, critical concentrations for Mott transitions, the emergence of state‑density tails near band edges, mechanisms for zero‑bias anomaly in impurity potential, energy dependence of effective masses and tunneling probability, and shifts of band edges. He was the first to observe Fermi energy “jump‑like” changes in heavily doped GaAs and Si (8×10¹⁸ to 6.25×10¹⁹ cm⁻³). Q.P. Abdurakhmanov founded a new scientific direction studying quantum state distributions at semiconductor band edges and established a scientific school.
In 1973, he defended his Candidate’s (PhD) dissertation on “Density of Quantum States Near Band Edges in Gallium Arsenide” at the Specialized Academic Council of Leningrad Polytechnic Institute.
In 1981, he established the Semiconductor Laboratory at the Institute of Applied Physics under Tashkent State University and led it until 1995.

Solar charging device for rechargeable batteries of mobile radio stations operating in UHF band: SZU‑15

Image of ocular blood vessels captured by a hardware‑software television microscope mounted on a Karl‑Zeiss surgical table at the Ophthalmology Department Clinic of the Tashkent Institute for Advanced Medical Training

During installation of a solar illumination system on the model of the Tashkent TV tower at TATU’s Fergana branch

   Based on scientific findings, Q.P. Abdurakhmanov supervised doctoral dissertations of Q.P. Abdurakhmanov (1990) and Sh.B. Utamuradova (2015). Under his leadership, such scholars as Sh. Mirakhmedov (1978), S.I. Vlasov (1979), A.Ya. Kvurt (1984), Sh.B. Utamuradova (1987), T.A. Umarov (1987), M.D. Khodjaev (1991), Q.X. Khodjaev (1991), X.U. Sagdullaev (1993), S.Q. Persheev (1995) defended their Candidate dissertations; Sh.B. Utamuradova (2015), S.S. Beknazarova (2015) defended doctoral theses; and O.O. Ochilova (2018), X. Yoʻldoshev (2019) defended their PhD theses in Philosophy.

Inventions

• Abdurakhmanov K.P., Kamilov T.S., Isayev M.Sh. "Method for manufacturing semiconductor photoelectric devices". Author's Certificate No. 3364320.

for manufacturing semiconductor photoelectric devices". Author's Certificate No. 3364320.

• Abdurakhmanov K.P., Adambaev K., Kamilov T.S., Khudayberdiyev S.S. "Method for manufacturing a radiation receiver". Author's Certificate No. 307138.
• Abdurakhmanov K.P., Ochilov O., Strizhevsky A.G. "Mobile solar charging device". Utility Model Patent No. FAP 00374, 2008.
• Abdurakhmanov K.P., Ochilov O., Strizhevsky A.G. "Mobile solar charging device". Utility Model Patent No. FAP 00482, 2009.
• Abdurakhmanov K.P., Ochilov O., Ochilova O.O. "Educational device for remote demonstration of interference phenomena in optics". Utility Model Patent No. FAP 00435, 2009.
• Abdurakhmanov K.P., Ochilov O., Ochilova O.O. "Device for comparative analysis of an object by the image of its surface". Invention Patent No. FAP 04195, 2010.
• Abdurakhmanov K.P. "Technology for industrial production of technical silicon by electric arc melting, protected as know-how". Intellectual Property. Object of intellectual property. Registration No. 04 2008. Center for Professional Evaluation.
• Abdurakhmanov K.P., Khamidov V.S., Bendik V. "eStudy.uz" distance learning system. Certificate for software product DGU No. 01979 (20100099) dated 01.07.2010.
• Abdurakhmanov K.P., Beknazarova S.S. "Software for PC 'MediaCourse Builder'". Certificate for software product No. DGU 02563 dated 11.07.2012.
• Abdurakhmanov K.P., Beknazarova S.S. Software for PC "Test Portal". Certificate for software product No. DGU 02535 dated 08.06.2012.
• Abdurakhmanov K.P., Beknazarova S.S. Electronic media course in physics. Certificate for software product No. 1356 dated 02.09.2013.
• Abdurakhmanov K.P., Azamatov Z.T., Ochilov O., Kanunikov V.V., Groshev I. "Aerodynamic engine". Author's Certificate Reg. No. 1AR201-305-17 dated 12.12.2013.
• Abdurakhmanov K.P., Tigai O.E., Bendik V.A., Khamidov V.S. Constructor of electronic educational complexes "E-TechBook". Certificate for software product No. 2283 dated 24.02.2015. Avtor.uz.
• Abdurakhmanov K.P., Azamatov Z.T., Kulagin I.A., Khusainov I.A. "Program for generating and simulating Fourier representations of laser interferograms". Intellectual Property Certificate No. DGU 04829, 2017.
• Abdurakhmanov K.P., Usmanov B.Sh., Takhirov U.Kh. "Solar drying installation". Patent application for a utility model. No. FAR 20190018 dated 01.02.2019.
• Abdurakhmanov K.P., Davronbekov D., Israilov Zh., Kiriakidi A., Tillaboev B., Elkin D., Davronbekov N. "Model for registering users of the IMEI information system". Intellectual Property Certificate No. DGU 06874 dated 17.07.2019.
• Abdurakhmanov K.P., Davronbekov D., Israilov Zh., Fayzullayev N., Davronbekov O. Calculation of IMEI of mobile terminal V1.0. Intellectual Property Certificate No. DGU 06201 dated 08.04.2019.