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| Solomon Pekar | |
|---|---|
| Name | Solomon Pekar |
| Birth date | 1927 |
| Birth place | Kyiv, Ukrainian SSR, Soviet Union |
| Death date | 2007 |
| Death place | Toronto, Ontario, Canada |
| Nationality | Soviet Union → Canada |
| Fields | Theoretical chemistry, quantum chemistry, solid state physics |
| Alma mater | University of Kyiv; Institute of Chemical Physics (Moscow) |
| Known for | Semiempirical methods, exciton theory, electron correlation in solids |
| Awards | D.I. Mendeleev Medal, Fellow of the Royal Society of Canada |
Solomon Pekar was a Soviet-born theoretical chemist and physicist noted for seminal work on electronic excitations, semiempirical quantum methods, and many-body effects in condensed matter. His research bridged quantum mechanics-based approaches and phenomenological models used across molecular spectroscopy, solid state physics, and materials science. Pekar held positions in leading Soviet institutions before emigrating to Canada where he continued influential theoretical and pedagogical work.
Pekar was born in Kyiv and received early schooling amid the interwar period and the upheavals of World War II. He undertook undergraduate and graduate studies at the University of Kyiv where he trained in physical chemistry and quantum theory under mentors associated with the Ukrainian Academy of Sciences. For doctoral work he moved to the Institute of Chemical Physics in Moscow, collaborating with researchers linked to the Soviet Academy of Sciences and participating in research programs connected to the postwar expansion of theoretical studies in the Soviet Union. His formative years overlapped with contemporaries active in the development of quantum electrodynamics, many-body theory, and the theory of semiconductors.
Pekar held research and professorial posts at leading Soviet laboratories including the Institute of Chemical Physics and affiliated institutes of the Moscow State University research network. He later accepted a faculty appointment in Canada, joining a department associated with University of Toronto-level research and collaborating with scholars from the National Research Council of Canada and other North American centers. Throughout his career he visited and lectured at institutions such as the Massachusetts Institute of Technology, the University of California, Berkeley, the Max Planck Society institutes in Germany, and research centers connected to the Royal Society of Canada. He participated in conferences convened by organizations including the International Union of Pure and Applied Chemistry and the International Conference on Chemical Physics.
Pekar made foundational contributions to the theory of electronic excitations in molecules and solids, developing models that clarified the role of electron–phonon coupling and polarization effects in dielectrics and molecular crystals. He advanced semiempirical quantum chemistry by formulating practical approximations that connected the Hartree–Fock method and perturbative corrections used in studies of molecular orbitals, optical absorption, and charge transport. His work on excitons built on and extended concepts associated with Yakov Frenkel and Lev Landau, producing treatments that have been applied to organic semiconductors, polaron problems, and low-dimensional materials such as graphene-family systems.
Pekar developed theoretical tools for describing electron correlation in extended systems, interfacing with methods related to Green's functions, the Bethe–Salpeter equation, and diagrammatic techniques popularized by figures like Lev Keldysh and Miguel A. Neirotti. His semi-microscopic approaches influenced computational strategies used in the modeling of optical spectra and nonlinear optics in complex media. He also contributed to understanding impurity states, exciton localization, and the interaction of electronic excitations with defects, linking to experimental programs in Raman spectroscopy, photoluminescence, and electron energy loss spectroscopy.
Pekar authored and coauthored numerous papers in leading journals and several books that became standard references for theorists and experimentalists working on excitation phenomena. His monographs presented rigorous treatments of exciton theory, polaron dynamics, and the semiempirical approximation schemes that bridge ab initio and phenomenological descriptions. He published in venues associated with the American Chemical Society, the American Physical Society, and European publishers connected to the Springer and North-Holland families, and contributed chapters to edited volumes alongside scholars from the Institute for Advanced Study and major universities. His texts were cited in studies of molecular crystals, optical properties of solids, and the theoretical foundations for modern organic electronic devices.
Pekar received recognition both within the Soviet Academy of Sciences system and internationally after moving to Canada. He was awarded honors such as the D.I. Mendeleev Medal and was elected a Fellow of the Royal Society of Canada. He received institutional awards and visiting fellowships from organizations including the National Science Foundation, the Royal Society (London) exchange programs, and research grants administered through the Canadian Institutes of Health Research-adjacent physical sciences initiatives. His work was recognized by citation-based honors within communities tied to chemical physics and materials science.
Pekar's career spanned Cold War-era Soviet research networks and the transnational collaborations of late 20th-century science. He maintained ties with colleagues from the Moscow State University tradition while mentoring generations of students in Toronto and elsewhere who went on to positions at institutions such as the University of British Columbia, the Princeton University chemistry department, and European centers including ETH Zurich and the Université Paris-Sud. His theoretical frameworks continue to inform modern research on excitonic devices, organic photovoltaics, and low-dimensional materials studied at centers like the Max Planck Institute for Solid State Research and the IBM Research laboratories. Pekar is remembered through citations, memorial lectureship events, and ongoing use of his semiempirical methods in computational chemistry and condensed matter curricula.
Category:1927 births Category:2007 deaths Category:Theoretical chemists Category:Canadian chemists Category:Soviet emigrants to Canada