Sergej Flach

Sergej Flach (born 1963 in Dresden) is a theoretical physicist whose research has spanned a number of scientific fields in his career. With about 240 publications to his name, his research has been cited over 16,000 times giving him an h-index of 58 and i10-index of 174.[1] He is a member of the American Physical Society, German Physical Society, Korean Physical Society, and New Zealand Institute of Physics.[2] He is an editorial board member of Chaos (2016-)[3] and was an editorial board member of Physical Review E (2009-2011).

Sergej Flach
Born1963
Dresden, Germany
Alma materTU Dresden
AwardsStefanos Pnevmatikos International Award, Alexander von Humboldt Foundation Fellow (Sonderstipendiat), Prize of the Joint Institute for Nuclear Research
Scientific career
FieldsCondensed matter, photonics, statistical physics, nonlinear dynamics and chaos
InstitutionsInstitute for Basic Science
Doctoral advisorsJürgen Schreiber, Paul Ziesche
Other academic advisorsNikolay Plakida, Wolfgang Götze, Chuck Willis
WebsiteIBS Center for Theoretical Physics of Complex Systems

He is the founding director of the Center for Theoretical Physics of Complex Systems at the Institute for Basic Science (IBS), a professor at the University of Science and Technology, and an honorary research fellow at the New Zealand Institute for Advanced Study in Massey University.

Education

He received his Masters (Diplom) in 1986 and PhD (Promotion) and Habilitation in theoretical physics in 1989 and 1998, respectively, at TU Dresden, Germany. His PhD thesis focused on the analysis of long time correlations of the lattice dynamics of crystals close to structural phase transitions and attempts to explain the central peak phenomenon observed e.g. in SrTiO3 and BaTiO3.

Career

During his Promotion study, he was a research assistant at TU Dresden until 1992, in which he started postdoc work in the Physics Department at Boston University. The independent postdoc was funded with a postdoctoral fellowship from the Deutsche Forschungsgemeinschaft (German Research Foundation). His host was Prof. Chuck Willis and Flach worked on the observation and properties of discrete breathers - generic exact localized solutions of broad classes of nonlinear lattice wave systems. In 1994, he was a guest scientist at Max Planck Institute for the Physics of Complex Systems in Dresden and later his position changed to become the head of visitors program in 1997. In 2012, he was a physics professor at the Centre for Theoretical Chemistry and Physics part of the New Zealand Institute for Advanced Study in Massey University Albany campus[4] until 2016.

He moved to South Korea to become director of the Center for Theoretical Physics of Complex Systems at the Institute for Basic Science (IBS) in 2014. The goals of the center include being a renowned laboratory for quantum dynamics and nonlinear classical nano-structured systems and research the interfaces of applied and computational theoretical condensed matter physics and optics.[5] The following year he became a professor at the University of Science and Technology (UST) in Daejeon and in 2017 renewed his connection with Massey University as an honorary research fellow.

In addition to writing academic journal publications, Flach has contributed as an editorial board member of Chaos (2016- ) and Physical Review E (2009-2011). He has also co-edited a book[6] and guest edited special journal issues.[7][8] And he has written sections[9][10] or chapters[11][12][13] in books, three issues of Physics Reports[14][15][16] and one issue of Reviews of Modern Physics.[17]

Known for
  • Discrete breathers: contributions to theoretical and experimental observation of localizing classical and quantum interacting waves on lattices[18]
  • Hamiltonian ratchets: derived symmetries of driven systems in space-time and controlled ways of breaking to obtain transport[19]
  • Q-breathers: contributions to the explanation of the Fermi-Pasta-Ulam paradox of statistical physics using periodic orbit theories[20][21]
  • Fano resonances in nanoscale structures: contributions to explanation and observation of Fano resonances in various settings of nanoscale devices, in particular photonic and plasmonic ones[22]
  • Universal destruction of Anderson localization for classical interacting waves: computational and analytical contributions to the explanation of universal dynamics of nonlinear disordered waves[23]
  • Flatband networks: introduced compact localized state based classifications[24]

Honors and awards

References
  1. "Sergej Flach - Google Scholar Citations". Google Scholar. Retrieved 21 April 2022.
  2. "Prof. Dr. Sergej Flach". Center for Theoretical Physics of Complex Systems. Institute for Basic Science. Retrieved 28 May 2018.
  3. "Editorial Board". Chaos: An Interdisciplinary Journal of Nonlinear Science. Retrieved 4 June 2018. Editors: Sergej Flach (Institute for Basic Science, Daejon, Korea) Nonlinear classical and quantum waves in condensed matter and photonics, out-of-equilibrium nonlinear classical and quantum dynamics
  4. "Prof. Sergej Flach (Professor in Physics)". Centre for Theoretical Chemistry and Physics. Massey University. Retrieved 29 May 2018.
  5. "Center for Theoretical Physics of Complex Systems: DirectorSergej FLACH". Institute for Basic Science. Retrieved 28 May 2018.
  6. Denz, Cornelia; Flach, Sergej; Kivshar, Yuri, eds. (2010). "16". Nonlinearities in Periodic Structures and Metamaterials (Monograph). Springer Series in Optical Sciences. Vol. 150. Bibcode:2010npsm.book.....D. doi:10.1007/978-3-642-02066-7. ISBN 978-3-642-02066-7. Retrieved 29 May 2018.
  7. Kivshar, Y. S.; Flach, S. (June 2003). Kivshar, Yuri S.; Flach, Sergej (eds.). "Focus Issue: Nonlinear Localized Modes: Physics and Applications". Chaos. 13 (2): 586–587. doi:10.1063/1.1577332. hdl:1885/15904. PMID 12777123. Retrieved 4 June 2018.
  8. Flach, Sergej; Mackay, Robert S., eds. (1 August 1998). "Localization in Nonlinear Lattices". Physica D: Nonlinear Phenomena. 119 (1–2): 1–238. Retrieved 4 June 2018.
  9. Flach, Sergej; Willis, C. R. (March 1998). Campbell, David K. (ed.). Discrete Breathers. Physics Reports. Vol. 295. pp. 181–264. arXiv:patt-sol/9704004. doi:10.1016/S0370-1573(97)00068-9. S2CID 119409330.
  10. Flach, Sergej; Zolotaryuk, Y. (2001). Kramer, Bernhard (ed.). Discrete Breathers in Condensed Matter (Monograph). Advances in Solid State Physics. Vol. 41. Springer Berlin Heidelberg. pp. 315–327. doi:10.1007/3-540-44946-9_26. ISBN 978-3-540-44946-1.
  11. FlachEmail, Sergej (2015). "1". In Garreau, Jean-Claude; Besse, Christophe (eds.). Nonlinear Optical and Atomic Systems. Lecture Notes in Mathematics. Vol. 2146. pp. 1–48. arXiv:1405.1122. doi:10.1007/978-3-319-19015-0_1. ISBN 978-3-319-19014-3. S2CID 117455634.
  12. Flach, Sergey; Gorbach, Andrey (2008). "1". Discrete Breathers with Dissipation. Lecture Notes in Physics. Vol. 751. Springer. pp. 1–32. CiteSeerX 10.1.1.576.9004. doi:10.1007/978-3-540-78217-9_11. ISBN 978-3-540-78216-2.
  13. Flach, Sergej (2004). "1". In Dauxois, Thierry; Litvak-Hinenzon, Anna; MacKay, Robert; Spanoudaki, Anna (eds.). Energy Localisation and Transfer. Advanced Series in Nonlinear Dynamics. Vol. 22. World Scientific. pp. 1–71. doi:10.1142/9789812794864_0001. ISBN 978-981-238-742-4.
  14. Flach, Sergej; Willis, Charles R. (March 1998). "Discrete breathers". Physics Reports. 295 (5): 181–264. arXiv:patt-sol/9704004. doi:10.1016/S0370-1573(97)00068-9. S2CID 119409330.
  15. Flach, Sergej; Gorbach, Andrey (October 2008). "Discrete breathers — Advances in theory and applications". Physics Reports. 467 (1–3): 1–116. Bibcode:2008PhR...467....1F. doi:10.1016/j.physrep.2008.05.002. ISSN 0075-8450.
  16. Denisov, Sergey; Flach, Sergej; Hänggi, Peter (20 May 2014). "Tunable transport with broken space–time symmetries". Physics Reports. 538 (3): 77–120. arXiv:1311.1086. Bibcode:2014PhR...538...77D. doi:10.1016/j.physrep.2014.01.003. S2CID 17507982.
  17. Miroshnichenko, Andrey E; Flach, Sergej; Kivshar, Yuri .S (11 August 2010). "Fano resonances in nanoscale structures". Reviews of Modern Physics. 82 (3): 2257–2298. arXiv:0902.3014. Bibcode:2010RvMP...82.2257M. CiteSeerX 10.1.1.248.1827. doi:10.1103/RevModPhys.82.2257. S2CID 16405447.
  18. Laptyeva, Tetyana V.; Ivanchenko, M. V.; Flach, Sergej (2014). "Nonlinear lattice waves in heterogeneous media". Journal of Physics A: Mathematical and Theoretical. 47 (49): 493001. arXiv:1407.1441. Bibcode:2014JPhA...47W3001L. doi:10.1088/1751-8113/47/49/493001. S2CID 118380040.
  19. Denisov, S.; Flach, Sergej (30 October 2001). "Dynamical mechanisms of dc current generation in driven Hamiltonian systems". Physical Review E. 64 (5): 056236. arXiv:nlin/0104006. Bibcode:2001PhRvE..64e6236D. doi:10.1103/PhysRevE.64.056236. PMID 11736083. S2CID 17609553.
  20. Flach, Sergej; Ivanchenko, M. V.; Kanakov, O. I. (2 August 2005). "q-Breathers and the Fermi-Pasta-Ulam problem". Physical Review Letters. 95 (6): 064102. arXiv:nlin/0504036. Bibcode:2005PhRvL..95f4102F. doi:10.1103/PhysRevLett.95.064102. PMID 16090957. S2CID 25619536.
  21. Flach, S.; Ivanchenko, M. V.; Kanakov, O. I. (2006). "q-breathers in Fermi-Pasta-Ulam chains: Existence, localization, and stability". Physical Review E. 73 (3): 036618. arXiv:nlin/0508039. Bibcode:2006PhRvE..73c6618F. doi:10.1103/PhysRevE.73.036618. PMID 16605688. S2CID 222178175.
  22. Miroshnichenko, Andrey E; Flach, Sergej; Kivshar, Yuri .S (11 August 2010). "Fano resonances in nanoscale structures". Reviews of Modern Physics. 82 (3): 2257–2298. arXiv:0902.3014. Bibcode:2010RvMP...82.2257M. CiteSeerX 10.1.1.248.1827. doi:10.1103/RevModPhys.82.2257. S2CID 16405447.
  23. Ivanchenko, M. V.; Laptyeva, Tetyana; Flach, Sergej (9 December 2011). "Anderson Localization or Nonlinear Waves: A Matter of Probability". Physical Review Letters. 107 (24): 240602. arXiv:1108.0899. Bibcode:2011PhRvL.107x0602I. doi:10.1103/PhysRevLett.107.240602. PMID 22242983. S2CID 15280335.
  24. Bodyfelt, Joshua D.; Leykam, Daniel; Danieli, Carlo; Yu, Xiaoquan; Flach, Sergej (5 December 2014). "Flatbands under Correlated Perturbations". Physical Review Letters. 113 (23): 236403. arXiv:1407.8345. Bibcode:2014PhRvL.113w6403B. doi:10.1103/PhysRevLett.113.236403. PMID 25526142. S2CID 27809768.
  25. "Recipients". Stefanos Pnevmatikos International Award. Retrieved 28 May 2018. Sergej FLACH: "For his many contributions in the theory of discrete breathers in discrete nonlinear Hamiltonian systems, with applications to localized modes in atomic and molecular crystals and to coupled arrays of Josphson junctions."
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