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Draft:A K Rajagopal

From Wikipedia, the free encyclopedia
A K Rajagopal
Born
Mysore
Known forContributions to density functional theory and quantum information
AwardsFellow of the American Physical Society
Scientific career
FieldsTheoretical solid-state physics
WorkplacesLSU, NRL
ThesisItinerant electron ferromagnetism
Academic advisors
Harvey Brooks
Notable students
Gary S. Grest[1]

Attipat Krishnaswamy Rajagopal (commonly known as A K Rajagopal) is an Indian-American theoretical physicist who has contributed to density functional theory and quantum information science. He is a Fellow of the American Physical Society (elected in 1970) and spent most of his career first at Louisiana State University and then at the United States Naval Research Laboratory.[2]

Early years and education

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Rajagopal was one of four sons and two daughters of A. A. Krishnaswami Ayyangar (1892–1953), an Indian mathematician who taught at the University of Mysore and worked on the history of Indian mathematics.[3] One of his brothers was the poet and scholar A. K. Ramanujan (1929–1993);[4] one of his brothers-in-law was the Indian academic K Bhogishayana (1926-2003). Rajagopal grew up in Mysore, and was an undergraduate at the Department of Physics at Yuvaraja College, Mysore.[3][5] He earned a Master's degree (1960) from the Indian Institute of Science, Bangalore, with a dissertation on lattice vibrations of zinc blende.[2][6] He then went to Harvard University on a Tata Memorial Travel Grant and a Gordon McKay Prize Fellowship, earning a PhD (1965) with a thesis entitled Itinerant electron ferromagnetism,[2][7] supervised by Harvey Brooks.[8]

Career

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Rajagopal held a faculty position in the Department of Physics and Astronomy at Louisiana State University in Baton Rouge for about two decades, from the mid-1960s until 1985.[2][9][10] In 1978 he spent a sabbatical year at the IBM Thomas J. Watson Research Center in Yorktown Heights.[11]

In 1985 he joined the Naval Research Laboratory (NRL) in Washington, D.C., where he conducted theoretical research in condensed matter and statistical physics, including magnetic and superconducting properties of metals and alloys, electron gas theories, long-time relaxation phenomena in complex systems, nanoelectronic structures, nonequilibrium time-dependent density functional theory, Tsallis entropy for nonextensive systems, and later quantum entanglement and information theory.[2] He is now President of the Inspire Institute, a 501(c)(3) nonprofit for scientific research, which was founded in 2006 by a small group of NRL-associated physicists.[2] He has also been an adjunct faculty at the Harish-Chandra Research Institute.[12]

Research

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In the 1970s, Rajagopal contributed to the early development of spin-density-functional theory. His paper with J. Callaway,[13] and his later sole author work[14] is credited as laying the rigorous foundations for relativistic density functional theory.[15][16] He also authored a review of the formalism.[17] Later contributions extended this work toward current-density-functional theory and relativistic formulations, including a 1995 paper with F. A. Buot.[18]

In the last two decades of his career, Rajagopal's research shifted toward quantum information science, including work on quantum entropy, entanglement, the Majorana representation of symmetric multi-qubit states, and generalizations of statistical mechanics (superstatistics) to the quantum domain.[19][20] Two concepts from this period are referred to using his name in the literature: the "Abe–Rajagopal (AR) q-conditional entropy"[21] and the "Rajagopal–Rendell (RR) quantum deficit".[22]

Selected publication

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Awards

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Rajagopal was elected as a Fellow of the American Physical Society in 1970,[23] and a Fellow of the Washington Academy of Sciences in1994.[2] He received a Distinguished Research Master award from Louisiana State University in 1984.[24]

References

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  1. ↑ "Louisiana State University Physics & Astronomy". www.phys.lsu.edu. Retrieved 2026-09-08.
  2. 1 2 3 4 5 6 7 "About Us". Inspire Institute. Archived from the original on 2026-02-01. Retrieved 2026-09-03.
  3. 1 2 "A A Krishnaswami Ayyangar (1892–1953)". MacTutor History of Mathematics Archive. University of St Andrews. Retrieved 2026-09-03.
  4. ↑ A. K. Srinivasan. "Historical work of A. A. K. Ayyangar". Retrieved 2026-09-03.
  5. ↑ "Physics". Yuvaraja College, University of Mysore. Retrieved 2026-09-03.
  6. ↑ Rajagopal, A. K.; Srinivasan, R. (1960-08-01). "Lattice vibrations and specific heat of zinc blende". Zeitschrift fur Physik. 158 (4): 471–482. Bibcode:1960ZPhy..158..471R. doi:10.1007/BF01327023. ISSN 1434-6001.
  7. ↑ Rajagopal, A. K. (1965). Itinerant electron ferromagnetism (Thesis). Harvard University.
  8. ↑ Rajagopal, A. K. (1966-02-04). "Spin Waves in an Interacting Electron Gas". Physical Review. 142 (1): 152. Bibcode:1966PhRv..142..152R. doi:10.1103/PhysRev.142.152. ISSN 0031-899X.
  9. ↑ Grest, G. S.; Rajagopal, A. K. (1974). "Excitation Energy of Liquid Helium II". Progress of Theoretical Physics. 52 (3): 811–. Bibcode:1974PThPh..52..811G. doi:10.1143/PTP.52.811.
  10. ↑ Ngai, K. L.; Rajagopal, A. K.; Rendell, R. W. (1983). "NMR Studies of Hydrogen Diffusion in Palladium and β-LaNi5 Hydrides". Electronic Structure and Properties of Hydrogen in Metals. NATO Conference Series. Vol. 6. Springer, Boston, MA. pp. 473–478.
  11. ↑ Rajagopal, A. K. (1978). "Linear-response functions in spin-density-functional theory". Physical Review B. 17 (7): 2980–2989. Bibcode:1978PhRvB..17.2980R. doi:10.1103/PhysRevB.17.2980.
  12. ↑ Chanda, Titas. "Members, including former adjunct professors". www.hri.res.in. Archived from the original on 2026-05-19. Retrieved 2026-09-08.
  13. ↑ Rajagopal, A. K.; Callaway, J. (1973-03-01). "Inhomogeneous Electron Gas". Physical Review B. 7 (5): 1912–1919. Bibcode:1973PhRvB...7.1912R. doi:10.1103/physrevb.7.1912. ISSN 0556-2805.
  14. ↑ Rajagopal, A K (1978-12-24). "Inhomogeneous relativistic electron gas". Journal of Physics C: Solid State Physics. 11 (24): L943–L948. Bibcode:1978JPhC...11L.943R. doi:10.1088/0022-3719/11/24/002. ISSN 0022-3719.
  15. ↑ Teale, Andrew M.; Helgaker, Trygve; Savin, Andreas; Adamo, Carlo; Aradi, Bálint; Arbuznikov, Alexei V.; Ayers, Paul W.; Baerends, Evert Jan; Barone, Vincenzo; Calaminici, Patrizia; Cancès, Eric; Carter, Emily A.; Chattaraj, Pratim Kumar; Chermette, Henry; Ciofini, Ilaria (2022). "DFT exchange: sharing perspectives on the workhorse of quantum chemistry and materials science". Physical Chemistry Chemical Physics. 24 (47): 28700–28781. Bibcode:2022PCCP...2428700T. doi:10.1039/D2CP02827A. ISSN 1463-9076. PMC 9728646. PMID 36269074.
  16. ↑ Bersson, Jonathan Swift; Kovtun, Mikael; Li, Xiaosong (2026). "Four-component relativistic density functional theory: grid requirements and small-component contributions". Physical Chemistry Chemical Physics. 28 (34): 20519–20531. doi:10.1039/D6CP02182D. ISSN 1463-9076. PMID 42557897.
  17. ↑ Rajagopal, A. K. (1980-01-01). Theory of Inhomogeneous Electron Systems: Spin-Density-Functional Formalism. pp. 59–193. doi:10.1002/9780470142608.ch2. ISSN 1934-4791. {{cite book}}: |journal= ignored (help)
  18. ↑ Rajagopal, A. K.; Buot, F. A. (1995-03-01). "Variational principles for ensembles of quantum states". Physical Review A. 51 (3): 1770–1775. Bibcode:1995PhRvA..51.1770R. doi:10.1103/PhysRevA.51.1770. ISSN 1050-2947. PMID 9911783.
  19. ↑ "A. K. Rajagopal — ResearchGate profile". Retrieved 2026-09-03.
  20. ↑ Rajagopal, A.K.; Abe, Sumiyoshi (2004-06-01). "Statistical mechanical foundations of power-law distributions". Physica D: Nonlinear Phenomena. 193 (1–4): 73–83. arXiv:cond-mat/0303064. Bibcode:2004PhyD..193...73R. doi:10.1016/j.physd.2004.01.010. ISSN 0167-2789.
  21. ↑ "Google Scholar search on Abe–Rajagopal q-conditional entropy". scholar.google.com. Retrieved 2026-09-08.
  22. ↑ "Google Scholar on Rajagopal–Rendell quantum deficit". scholar.google.com. Retrieved 2026-09-08.
  23. ↑ "APS Fellows archive". www.aps.org. Retrieved 2026-09-08.
  24. ↑ "Distinguished Research Master Award". www.lsu.edu. Retrieved 2026-09-08.
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