Scientific Interests

Prof. Kossacki’s main research interests are related to excitons and charged excitons in 2D systems such as semiconductor quantum wells and layered materials (TMDs), as well as magnetospectroscopy of II-VI quantum wells, quantum dots (QD), and nanostructures with diluted magnetic semiconductors, in particular QDs with individual magnetic ions. He studied magneto-Raman in graphene and magnetospectroscopy of TMD materials (including contribution to the discovery of single-photon sources in WSe2). He initiated ultrafast magnetospectroscopy at the University of Warsaw, measurements in nanosecond pulsed magnetic field, manipulation of single magnetic ion in semiconductor quantum dots and the first demonstration of the coherent precession of an individual Mn spin in the QD. He has also experience in time-resolved spectroscopy of intervalley relaxation of bright and dark excitons in TMDs.

He is a co-author of more than 200 peer-reviewed papers and one book chapter. He is currently a referee in more than 6 journals including Nature Nanotechnology, Nature Materials, Nature Communications and Physical Review Letters. He is a scientific expert for various National Research Agencies (in Poland, Germany and France). He was Chairman of the International School and Conference on the Physics of Semiconductors “Jaszowiec” in Krynica 2012, a member of the program committee of the 20th International Conference on “High Magnetic Fields in Semiconductor Physics”, (HMF-20, in Chamonix Mont-Blanc, France 2012), member of the international advisory committee of the International Conference on II-VI Compounds (since 2013). He was president of the Polish Physics Olympiad (2011-2019) and a member of the Polish Physical Society.

Selected Publications:

Magnetospectroscopy of carbon based nanoallotropes and layered semiconductors

  • Carrier Relaxation in Epitaxial Graphene Photoexcited Near the Dirac Point, S. Winnerl, M. Orlita, P. Plochocka, P. Kossacki, M. Potemski, T. Winzer, E. Malic, A. Knorr, M. Sprinkle, C. Berger, W.A. de Heer, H. Schneider, M. Helm, Phys. Rev. Lett. 107, 237401 (2011)
  • Tuning the Electron-Phonon Coupling in Multilayer Graphene with Magnetic Fields C. Faugeras, M. Amado, P. Kossacki, M. Orlita, M. Sprinkle, C. Berger, W.A. de Heer, M. Potemski, Phys. Rev. Lett 103, 186803 (2009)
  • Slowing hot-carrier relaxation in graphene using a magnetic field P. Plochocka, P. Kossacki, A. Golnik, T. Kazimierczuk, C. Berger, W.A. de Heer, M. Potemski, Phys. Rev. B, 80, 245415 (2009)
  • Magneto-Raman Scattering of Graphene on Graphite: Electronic and Phonon Excitations C. Faugeras, M. Amado, P. Kossacki, M. Orlita, M. Kuhne, A.A.L. Nicolet,Y.I. Latyshev, M. Potemski, Phys. Rev. Lett. 107, 036807 (2011)
  • Electronic excitations and electron-phonon coupling in bulk graphite through Raman scattering in high magnetic fields, Kossacki, C. Faugeras, M. Kuhne, M. Orlita, A.A.L. Nicolet, J.M. Schneider, D.M. Basko, Y.I. Latyshev, M. Potemski, Phys. Rev. B 84, 235138 (2011)
  • Tuning Valley Polarization in a WSe2 Monolayer with a Tiny Magnetic Field,  Smolenski, M. Goryca, M. Koperski, C. Faugeras, T. Kazimierczuk, A. Bogucki, K. Nogajewski, P. Kossacki, M. Potemski, PHYSICAL REVIEW X 6, 021024 (2016)
  • Single photon emitters in exfoliated WSe2 structures, Koperski, K. Nogajewski, A. Arora, V. Cherkez, P. Mallet, J.=Y. Veuillen, J. Marcus, P. Kossacki, M. Potemski, Nat. Nano. 10,503 (2015)


Quantum dots with single magnetic ions as a new solotronic systems

  • Magnetic ground state of an individual Fe2+ ion in strained semiconductor nanostructure,  Smoleński, T. Kazimierczuk, J. Kobak, M. Goryca, A. Golnik, P. Kossacki, W. Pacuski,  Nature Comm.  7, 10484 (2016 )
  • Spin-lattice relaxation of an individual Mn2+ ion in a CdTe/ZnTe quantum dot,  Goryca, M. Koperski, T. Smolenski, Ł. Cywinski, P. Wojnar, P. Plochocka, M. Potemski, P. Kossacki, PHYSICAL REVIEW B  92, 045412 (2015)
  • Designing quantum dots for solotronics, Kobak, T. Smoleński, M. Goryca, M. Papaj, K. Gietka, A. Bogucki, M. Koperski, J.-G. Rousset, J. Suffczyński, E. Janik, M. Nawrocki, A. Golnik, P. Kossacki, W. Pacuski,  Nature Comm. 5, 3191 (2014)
  • Micropillar Cavity Containing a CdTe Quantum Dot with a Single Manganese Ion,  Pacuski, T. Jakubczyk, C. Kruse, J. Kobak, T. Kazimierczuk, M. Goryca, A. Golnik, P. Kossacki, M. Wiater, P. Wojnar, G. Karczewski, T. Wojtowicz, and D. Hommel,  Crystal Growth & Design 14, 988 (2014)
  • Coherent Precession of an Individual 5/2 Spin, Goryca, M. Koperski, P. Wojnar, T. Smoleński, T. Kazimierczuk, A. Golnik, and P. Kossacki,  Phys. Rev. Lett. 113, 227202  (2014)


Coupled quantum dots

  • Optical Manipulation of a Single Mn Spin in a CdTe-Based Quantum Dot,  Goryca, T. Kazimierczuk, M. Nawrocki, A. Golnik, J.A. Gaj, P. Kossacki, P. Wojnar, G. Karczewski, Phys. Rev. Lett. 103, 087401 (2009)
  • Excitation mechanisms of individual CdTe/ZnTe quantum dots studied by photon correlation spectroscopy, Suffczynski, T. Kazimierczuk, M. Goryca, B. Piechal, A. Trajnerowicz, K. Kowalik, P. Kossacki, A. Golnik, K.P. Korona, M. Nawrocki, J.A. Gaj, G. Karczewski, Phys. Rev. B 74,  085319 ( 2006)
  • Optically induced energy and spin transfer in nonresonantly coupled pairs of self-assembled CdTe/ZnTe quantum dots, T. Kazimierczuk, J. Suffczynski, A. Golnik, J.A. Gaj, P. Kossacki, P. Wojnar, Phys. Rev. B 79, 153301 (2009)
  • Brightening of dark excitons in a single CdTe quantum dot containing a single Mn2+ ion, M. Goryca, P. Plochocka, T. Kazimierczuk, P. Wojnar, G. Karczewski, J.A. Gaj, M. Potemski, P. Kossacki, Phys. Rev. B 82, 165323 (2010)
  • Picosecond charge variation of quantum dots under pulsed excitation
    Kazimierczuk, M. Goryca, M. Koperski, A. Golnik, J. A. Gaj, M. Nawrocki, P. Wojnar, and P. Kossacki, Phys. Rev. B 81, 155313 (2010)


Diluted magnetic semiconductors and quantum wells

  1. Influence of s,p-d and s-p exchange couplings on exciton splitting in Zn1−xMnxO
    Pacuski, J. Suffczyński, P. Osewski, P. Kossacki, A. Golnik, J. A. Gaj, C. Deparis, C. Morhain, E. Chikoidze, Y. Dumont, D. Ferrand, J. Cibert, and T. Dietl
    Phys. Rev. B 84, 035214 (2011)
  2. Light and electric field control of ferromagnetism in magnetic quantum structures
    Boukari, P. Kossacki, M. Bertolini, D. Ferrand, J. Cibert, S. Tatarenko, A. Wasiela, J.A. Gaj, T. Dietl, Phys. Rev. Lett 88 (2002)
  3. Neutral and positively charged excitons: A magneto-optical study of a p-doped Cd1-xMnxTe quantum well
    Kossacki, J. Cibert, D. Ferrand, Y.M. d’Aubigne, A. Arnoult, A. Wasiela, S. Tatarenko, J.A. Gaj, Phys. Rev. B  60,  16018-16026 (1999).
  4. Effect of the s,p-d exchange interaction on the excitons in Zn1-xCoxO epilayers
    Pacuski, D. Ferrand, J. Cibert, C. Deparis, J.A. Gaj, P. Kossacki, C. Morhain,
    Phys. Rev. B 73, 035214 (2006)
  5. Radiative behavior of negatively charged excitons in CdTe-based quantum wells:
    A spectral and temporal analysis, Ciulin, P. Kossacki, S. Haacke, J.D. Ganiere, B. Deveaud, A. Esser, M. Kutrowski, T. Wojtowicz,   Phys. Rev. B  62, 16310-16313 (2000)
  6. Ordered magnetic phase in Cd1-xMnxTe/Cd1-y-zMgyZnzTe : N heterostructures: magnetooptical studies, Kossacki, D. Ferrand, A. Arnoult, J. Cibert, S. Tatarenko, A. Wasiela, Y.M. d’Aubigne, J.L. Staehli, J.D. Ganiere, W. Bardyszewski, K. Swiatek, M. Sawicki, J. Wrobel, T. Dietl,   Physica E  6, 709-712 (2000)
  7. p-type doping of II-VI heterostructures from surface states: Application to ferromagnetic Cd1-xMnxTe quantum wells, Maslana, P. Kossacki, M. Bertolini, H. Boukari, D. Ferrand, S. Tatarenko, J. Cibert, J.A. Gaj,  Appl. Phys. Lett. 82, 1875-1877 (2003)
  8. Observation of strong-coupling effects in a diluted magnetic semiconductor
    Pacuski, P. Kossacki, D. Ferrand, A. Golnik, J. Cibert, M. Wegscheider, A. Navarro-Quezada, A. Bonanni, M. Kiecana, M. Sawicki, T. Dietl, Phys. Rev. Lett. 100, 037204 (2008)
  9. Optical studies of charged excitons in II-VI semiconductor quantum wells
    Journal of Phys. – cond. mat. 15, R471-R493 (2003)
  10. Parabolic quantum wells of diluted magnetic semiconductor Cd1-xMnxTe
    Wojtowicz, M. Kutrowski, M. Surma, K. Kopalko, G. Karczewski, J. Kossut, M. Godlewski, P. Kossacki, N.T. Khoi,  Appl. Phys. Lett. 68, 3326-3328 (1996)
  11. Light controlled and probed ferromagnetism of (Cd,Mn)Te quantum wells
    Kossacki, A. Kudelski, J.A. Gaj, J. Cibert, S. Tatarenko, D. Ferrand, A. Wasiela, B. Deveaud,  T. Dietl,  Physica E 12, 344-350 (2002)
  12. Femtosecond study of the interplay between excitons, trions, and carriers in (Cd,Mn)Te quantum wells, Plochocka,  P. Kossacki, W. Maslana,  J. Cibert, S. Tatarenko, C. Radzewicz, J.A. Gaj,  Phys. Rev. Lett. 92, 177402 (2004)
  13. Magnetization Dynamics Down to a Zero Field in Dilute (Cd,Mn)Te Quantum Wells
    Goryca, D. Ferrand, P. Kossacki, M. Nawrocki, W. Pacuski, W. Maslana,  J.A. Gaj, S. Tatarenko, J. Cibert, T. Wojtowicz, G. Karczewski, Phys. Rev. Lett. 102, 046408 (2009)
  14. Photoluminescence of p-doped quantum wells with strong spin splitting
    Kossacki, H. Boukari, M. Bertolini, D. Ferrand, J. Cibert, S. Tatarenko, J.A. Gaj, B. Deveaud, V. Ciulin, M. Potemski, Phys. Rev. B  70, 195337 (2004)
  15. Exciton-exciton interaction and biexcitons in the presence of spin-polarized carriers
    Kossacki, P. Plochocka, B. Piechal, W. Maslana, A. Golnik, J. Cibert, S. Tatarenko, J.A. Gaj,  Phys. Rev. B  72, 035340 (2005)
  16. Faraday rotation in a study of charged excitons in Cd(1-x)Mn(x)Te
    Maslana, W. Mac, J.A. Gaj, P. Kossacki, A. Golnik, J. Cibert, S. Tatarenko, T. Wojtowicz, G. Karczewski, J. Kossut,   Phys. Rev. B 63,  165318  (2001)
  17. Excitonic giant zeeman effect in GaN : Mn(3+)
    Pacuski, D. Ferrand, J. Cibert, J.A. Gaj, A. Golnik, P. Kossacki, S. Marcet, E. Sarigiannidou, H. Mariette,  Phys. Rev. B 76, 165304  (2007)


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