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    Technische Physik

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    Prof. Dr. Sebastian Klembt
    Juniorprofessor - Light-Matter Interaction and Topological Photonics

    About

    I am an Assistant Professor (Juniorprofessor) at the Chair for Applied Physics of the Julius-Maximilians-Universität Würzburg. Since 2018, I am pursuing my habilitation in the field of experimental physics. My research focus is to take effects of topological protection known from solid state physics (such as the Quantum Hall or Quantum spin Hall effect) and to bring them to photonic systems. In particular, we have realized the first topological insulator for hybrid light-matter particles: exciton-polaritons. This platform promises unique novel features, new many-body effects and quantum-coherent phenomena in this symbiotic light-matter system. Furthermore, we work on technological implementations of semiconductor based Topological Lasers and Exceptional Point Sensors.

    Research Interests

    Quantum Photonics, Optical Spectroscopy, Light-matter Interactions in Semiconductors, Topological Effects in Photonic Systems, Epitaxy, Technology and Design of Microcavities, Exciton-Polaritons in Lattices, Novel Semiconductor Laser Designs, Novel 2D Semiconductor Materials

    Academic Career

    Since 2020
    Juniorprofessor - Light-Matter Interaction and Topological Photonics, University of Würzburg, Chair for Applied Physics

    Since 2018
     „Akad. Rat auf Zeit“ and Habilitation, University of Würzburg, Chair for Applied Physics

    2016 – 2018 
    Marie-Skłodowska-Curie-Action Fellowship “Topological Polaritons”

    Since 2015
    Group leader, Spectroscopy and Topological Photonics at the Chair for Applied Physics, University of Würzburg

    2013 – 2015
    Postdoctoral Researcher at Institut Néel, CNRS, Grenoble, France with Dr. M. Richard and Dr. Le Si Dang

    2013
    PhD (Dr. rer. nat. with highest honor „summa cum laude“), University of Bremen

    2006 – 2009
    Guest Student and Diploma thesis at ETH Zürich, Switzerland

    Mai 2009
    Diploma in Physics, University of Bremen

     

    Recent Teaching

    SS20: Lecture Phänomene der Physik, Hauptseminar Nanostrukturtechnik, Group seminar Recent Advances in Topological Photonics and Polaritonics, Lab course F-Praktikum: Optical Spectroscopy

    WS19/20: Lecture Physik für Studierende der Medizin im 1. Fachsemester, Group seminar Recent Advances in Topological Photonics and Polaritonics, Lab course F-Praktikum: Optical Spectroscopy

    SS19: Group seminar Recent Advances in Topological Photonics and Polaritonics, Lab course F-Praktikum: Optical Spectroscopy

    WS18/19: Exercise class Optik- und Quantenphysik 1, Lab course F-Praktikum: Optical Spectroscopy

     

    List of Publications (10/2021)

    1. Topological insulator vertical-cavity laser array
      A. Dikopoltsev, T. H. Harder, E. Lustig, O. A. Egorov, J. Beierlein, A. Wolf, Y. Lumer, M. Emmerling, C. Schneider, S. Höfling, M. Segev, and S. Klembt
      Science       373, 6562 (2021).      https://doi.org/10.1126/science.abj2232 (2021)
       
    2. Room temperature topological polariton laser in an organic lattice
      M. Dusel, S. Betzold, T.H. Harder, M. Emmerling, J. Ohmer, U. Fischer, R. Thomale, C. Schneider, S. Höfling, and S. Klembt
      Nano Lett. 21, 15 (2021).      https://doi.org/10.1021/acs.nanolett.1c00661 (2021)
       
    3. Bosonic condensation of exciton–polaritons in an atomically thin crystal
      C. Antón-Solanas, M. Waldherr, M. Klaas, T. H. Harder, H. Cai, S. Klembt, A. V. Kavokin, S. Tongay, K. Watanabe, T. Taniguchi, S. Höfling, C. Schneider
      Nat Mater. 20, 1233 (2021).      https://doi.org/10.1038/s41563-021-01000-8 (2021)
       
    4. Kagome Flatbands for Coherent Exciton-Polariton Lasing
      T. H. Harder, O. A. Egorov, C. Krause, J. Beierlein, P. Gagel, M. Emmerling, C. Schneider, U. Peschel, S. Höfling, and S. Klembt
      https://arxiv.org/abs/2011.10766 (2020)
       
    5. Coherent topological polariton laser
      T. H. Harder, M. Sun, O. A. Egorov, I. Vakulchyk, J. Beierlein, P. Gagel, M. Emmerling, C. Schneider, U. Peschel, I. G. Savenko, S. Klembt, and S. Höfling
      https://arxiv.org/abs/2005.14546 (2020)
       
    6. Propagative oscillations in co-directional polariton waveguide couplers
      J. Beierlein, E. Rozas, O.A. Egorov, M. Klaas, A. Yulin, H. Suchomel, T.H. Harder, M. Emmerling, M.D. Martín, I.A. Shelykh, C. Schneider, U. Peschel, L. Viña, S. Höfing, and S. Klembt
      Physical Review Letters 126, 075302 (2021).      https://doi.org/10.1103/PhysRevLett.126.075302
       
    7. Topological insulator VCSEL array
      A. Dikopoltsev, T. H. Harder, E. Lustig, O. A. Egorov, J. Beierlein, M. Emmerling, C. Schneider, S. Höfling, M. Segev, and S. Klembt
      https://doi.org/10.1364/CLEO_QELS.2020.FM1A.4 (2020)
       
    8. Impact of the Energetic Landscape on Polariton Condensates’ Propagation along a Coupler
      E. Rozas, J. Beierlein, A. Yulin, M. Klaas, H. Suchomel, O. Egorov, I. A. Shelykh, U. Peschel, C. Schneider, S. Klembt, S. Höfling, M. Dolores Martín,* and L. Viña
      Advanced Optical Mater. 8, 2000650 (2020).     https://doi.org/10.1002/adom.202000650
       
    9. Spatio-temporal coherence in vertically emitting GaAs-based electrically driven polariton lasers
      H. Suchomel, M. Klaas, S. Betzold, P. Gagel, J. Beierlein, S. Klembt, C. Schneider, and S. Höfling
      Applied Physics Letters 116, 171103 (2020).     https://doi.org/10.1063/5.0007456
       
    10. Exciton-polaritons in flatland: Controlling flatband properties in a Lieb lattice
      T. H. Harder, O. A. Egorov, J. Beierlein, P. Gagel, J. Michl, M. Emmerling, C. Schneider, U. Peschel, S. Höfling, and S. Klembt
      Physical Review B 102, 121302(R) (2020).           arXiv:2002.05405 (2020)
       
    11. Room temperature Organic Exciton-Polariton Condensate in a Lattice
      M. Dusel, S. Betzold, O. A. Egorov, S. Klembt, J. Ohmer, U. Fischer, S. Höfling, and C. Schneider
      Nature Communications 11, 2863 (2020).      arXiv:1907.05065 (2020)
       
    12. Coherence and Interaction in confined room-temperature polariton condensates with Frenkel excitons
      S. Betzold, M. Dusel, O. Kyriienko, C. P. Dietrich, S. Klembt, J. Ohmer, U. Fischer, I. A. Shelykh, C. Schneider, and S. Höfling
      ACS Photonics 7, 384-392 (2020).      doi.org/10.1021/acsphotonics.9b01300
       
    13. Nonresonant spin selection methods and polarization control in exciton-polariton condensates
      M. Klaas, O. A. Egorov, T. C. H. Liew, A. Nalitov, V. Marković, H. Suchomel, T. H. Harder, S. Betzold, E. A. Ostrovskaya, A. Kavokin, S. Klembt, S. Höfling, and C. Schneider
      Physical Review B 99, 115303 (2019).                doi.org/10.1103/PhysRevB.99.115303
       
    14. Magnetic-field-induced splitting and polarization of monolayer-based valley exciton polaritons
      N. Lundt, M. Klaas, E. Sedov, M. Waldherr, H. Knopf, M. Blei, S. Tongay, S. Klembt, T. Taniguchi, K. Watanabe, U. Schulz, A. Kavokin, S. Höfling, F. Eilenberger, and C. Schneider
      Physical Review B 100 (12), 121303 (2019).      https://arxiv.org/abs/1901.05250
       
    15. Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor
      N. Lundt, Ł. Dusanowski, E. Sedov, P. Stepanov, M.M. Glazov, S. Klembt, M. Klaas, J. Beierlein, Ying Qin, S. Tongay, M. Richard, A.V. Kavokin, S. Höfling, and C. Schneider
      Nature Nanotechnology 14, 770–775 (2019).      doi.org/10.1038/s41565-019-0492-0
       
    16. Topologischer Isolator aus Licht und Materie: Festkörperphysik
      S. Klembt, T.H. Harder, and S. Höfling
      Physik in unserer Zeit 50, 11-12 (2019).  doi.org/10.1002/piuz.201970107
       
    17. Counter-directional polariton coupler
      M. Klaas, J. Beierlein, E. Rozas, S. Klembt, H. Suchomel, T.H. Harder, K. Winkler, M. Emmerling, H. Flayac, M.D. Martín, L. Viña, S. Höfling, C. Schneider
      Applied Physics Letters 114, 061102 (2019).        doi.org/10.1063/1.5067247
       
    18. Two-kind boson mixture honeycomb Hamiltonian of Bloch exciton-polaritons
      H. Pan, K. Winkler, M. Powlowski, M. Xie, A. Schade, M. Emmerling, M. Kamp, S. Klembt, C. Schneider, T. Byrnes, S. Höfling, and N. Y. Kim
      Physical Review B 99, 045302 (2019).   doi.org/10.1103/PhysRevB.99.045302
       
    19. Platform for Electrically Pumped Polariton Simulators and Topological Lasers
      H. Suchomel*, S. Klembt*, T. H. Harder, M. Klaas, O. A. Egorov, K. Winkler, M. Emmerling, R. Thomale, S. Höfling, C. Schneider
      Physical Review Letters 121, 257402 (2018).       doi.org/10.1103/PhysRevLett.121.257402
       
    20. Exciton-polariton topological insulator
      S. Klembt, T. H. Harder, O. A. Egorov, K. Winkler, R. Ge, M. A. Bandres, M. Emmerling, L. Worschech, T. C. H. Liew, M. Segev, C. Schneider, S. Höfling
      Nature 562, 552 (2018).                doi.org/10.1038/s41586-018-0601-5
       
    21. Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity
      M. Waldherr, N. Lundt, M. Klaas, S. Betzold, M. Wurdack, V. Baumann, E. Estrecho, A. Nalitov, E. Cherotchenko, H. Cai, E. A. Ostrovskaya, A. V. Kavokin, S. Tongay, S. Klembt, S. Höfling, C. Schneider
      Nature Communications 9, 3286 (2018).               doi.org/10.1038/s41467-018-05532-7
       
    22. Thermal decoherence of a nonequilibrium polariton fluid
      S. Klembt, P. Stepanov, T. Klein, A. Minguzzi, M. Richard
      Physical Review Letters 120, 035301 (2018).       doi.org/10.1103/PhysRevLett.120.035301
       
    23. Evolution of temporal coherence in confined exciton-polariton condensates
      M. Klaas, H. Flayac, M. Amthor, I.G. Savenko, S. Brodbeck, T. Ala-Nissila, S. Klembt,  C. Schneider, S. Höfling
      Physical Review Letters 120, 017401 (2018).       doi.org/10.1103/PhysRevLett.120.017401
       
    24. Observation of macroscopic valley-polarized monolayer exciton-polaritons at room temperature
      N. Lundt, S. Stoll, P. Nagler, A. Nalitov, S. Klembt, S. Betzold, J. Goddard, E. Frieling, A.V. Kavokin, C. Schüller, T. Korn, S. Höfling, C. Schneider
      Physical Review B 96, 241403 (2017).     doi.org/10.1103/PhysRevB.96.241403
       
    25. Polariton condensation in S- and P-flatbands in a two-dimensional Lieb lattice
      S. Klembt, T.H. Harder, O.A. Egorov, K. Winkler, H. Suchomel, J. Beierlein, M.. Emmerling, C. Schneider, S. Höfling
      Applied Physics Letters 111, 231102 (2017).        doi.org/10.1063/1.4995385
       
    26. Prototype of a bistable polariton field-effect transistor switch
      H. Suchomel, S. Brodbeck, T.C.H. Liew, M. Amthor, M. Klaas, S. Klembt, M. Kamp, S. Höfling, C. Schneider
      Scientific Reports 7, 5114 (2017).             doi.org/10.1038/s41598-017-05277-1
       
    27. Electrical and optical switching in the bistable regime of an electrically injected polariton laser
      M. Klaas, H. Sigurdsson, T.C.H. Liew, S. Klembt, M. Amthor, F. Hartmann, L. Worschech, C. Schneider, S. Höfling
      Physical Review B 96, 041301 (2017).     doi.org/10.1103/PhysRevB.96.041301
       
    28. Valley polarized relaxation and upconversion luminescence from Tamm-plasmon trion–polaritons with a MoSe2 monolayer
      N. Lundt, P. Nagler, A. Nalitov, S. Klembt, M. Wurdack, S. Stoll, T.H. Harder, S. Betzold, V. Baumann, A.V. Kavokin, C. Schüller, T. Korn, S. Höfling, C. Schneider
      2D Materials 4, 025096 (2017).                 doi.org/10.1088/2053-1583/aa6ef2
       
    29. Exciton-polariton flows in cross-dimensional junctions
      K. Winkler, H. Flayac, S. Klembt, A. Schade, D. Nevinskiy, M. Kamp, C. Schneider, S. Höfling
      Physical Review B 95, 201302 (2017).     doi.org/10.1103/PhysRevB.95.201302
       
    30. Tunable Bragg polaritons and nonlinear emission from a hybrid metal-unfolded ZnSe-based microcavity
      SKSU Rahman, T. Klein, J. Gutowski, S. Klembt, K. Sebald
      Scientific Reports 7, 767 (2017).                               doi.org/10.1038/s41598-017-00878-2
       
    31. Optical probing of the Coulomb interactions of an electrically pumped polariton condensate
      M. Klaas, S. Mandal, T.C.H. Liew, M. Amthor, S. Klembt, L. Worschech, C. Schneider, S. Höfling
      Applied Physics Letters 110, 151103 (2017).        doi.org/10.1063/1.4979836
       
    32. Room-temperature Tamm-plasmon exciton-polaritons with a WSe2 monolayer
      N. Lundt, S. Klembt, E. Cherotchenko, S. Betzold, O. Iff, A. V. Nalitov, M. Klaas, C. P. Dietrich, A.V. Kavokin, S. Höfling, C. Schneider
      Nature communications 7, 13328 (2016).             doi.org/10.1038/ncomms13328
       
    33. Observation of a hybrid state of Tamm plasmons and microcavity exciton polaritons
      SKSU Rahman, T. Klein, S. Klembt, J. Gutowski, D. Hommel, K. Sebald
      Scientific Reports 6, 34392 (2016).           doi.org/10.1038/srep34392
       
    34. Tamm plasmon polaritons in the visible spectral region and its optical properties in ZnSe‐based microcavities
      SKSU Rahman, K. Sebald, J. Gutowski, T. Klein, S Klembt, C. Kruse, D. Hommel
      physica status solidi (c) 13, 498 (2016).                 doi.org/10.1002/pssc.201510296
       
    35. Bragg polaritons in a ZnSe-based unfolded microcavity at elevated temperatures
      K. Sebald, SKSU Rahman, M. Cornelius, T. Kaya, J. Gutowski, T. Klein, A. Gust, D. Hommel, S. Klembt
      Applied Physics Letters 108, 121105 (2016).        doi.org/10.1063/1.4944717
       
    36. Polariton lasing in high-quality selenide-based micropillars in the strong coupling regime T. Klein, S. Klembt, E. Durupt, C. Kruse, D. Hommel, M. Richard
      Applied Physics Letters 107, 071101 (2015).        doi.org/10.1063/1.4928492
       
    37. Tailoring the optical properties of wide-bandgap based microcavities via metal films
      K. Sebald, SKSU Rahman, M. Cornelius, J. Gutowski, T. Klein, S. Klembt, C. Kruse, D. Hommel
      Applied Physics Letters 107, 062101 (2015).        doi.org/10.1063/1.4928604
       
    38. Exciton-polariton gas as a nonequilibrium coolant
      S. Klembt, E. Durupt, S. Datta, T. Klein, A. Baas, Y. Léger, C. Kruse, D. Hommel, A. Minguzzi, M. Richard
      Physical Review Letters 114, 186403 (2015).       doi.org/10.1103/PhysRevLett.114.186403
       
    39. High-power green and blue electron-beam pumped surface-emitting lasers using dielectric and epitaxial distributed Bragg reflectors
      T. Klein, S. Klembt, V.I. Kozlovsky, A. Zheng, M.D. Tiberi, C. Kruse
      Journal of Applied Physics 117, 113106 (2015).  doi.org/10.1016/0022-0248(92)90909-3
       
    40. Fabrication of ZnSe‐based microcavities for lasing in the strong coupling regime and polariton confinement
      T. Klein, S. Klembt, K Sebald, S Figge, A Gust, C Kruse, D Hommel, J. Gutowski, E. Durupt, Le Si Dang, M. Richard
      (invited article) physica status solidi (c) 11, 1267 (2014).  doi.org/10.1002/pssc.201300705
       
    41. II-VI-basierte Mikrokavitäten für den blau-violetten Spektralbereich: Lasing im Bereich schwacher und starker Kopplung
      S. Klembt
      mbv, Mensch-und-Buch-Verlag, Dissertationsschriften (2014)                    Link
       
    42. Blue lasing and strong coupling in ZnSe monolithic microcavities
      K. Sebald, M. Seyfried, S. Klembt, C. Kruse, T. Aschenbrenner, D. Hommel, S. Bley, A. Rosenauer, J. Gutowski
      physica status solidi (c) 10, 1230 (2013).               doi.org/10.1002/pssc.201200745
       
    43. On the structural properties of MgS-rich II–VI-based microcavities
      S. Klembt, K. Frank, G. Qian, T. Klein, A. Rosenauer, D. Hommel, C. Kruse
      Journal of Crystal Growth 378, 270 (2013).          doi.org/10.1016/j.jcrysgro.2012.12.003
       
    44. Strong coupling in monolithic microcavities with ZnSe quantum wells
      K Sebald, M Seyfried, S Klembt, S Bley, A Rosenauer, D Hommel, C. Kruse
      Applied Physics Letters 100, 161104 (2012).        doi.org/10.1063/1.4704188
       
    45. Blue monolithic II-VI-based vertical-cavity surface-emitting laser
      S. Klembt, M. Seyfried, T. Aschenbrenner, K. Sebald, J. Gutowski, D. Hommel, C. Kruse
      Applied Physics Letters 100, 121102 (2012).        doi.org/10.1063/1.3696029
       
    46. Optical polariton properties in ZnSe-based planar and pillar structured microcavities
      K. Sebald, A. Trichet, M. Richard, L.S. Dang, M. Seyfried, S. Klembt, C. Kruse, D. Hommel
      The European Physical Journal B 84, 381 (2011).               doi.org/10.1140/epjb/e2011-20551-9
       
    47. High-reflectivity II-VI-based distributed Bragg reflectors for the blue-violet spectral range
      S. Klembt, H. Dartsch, M. Anastasescu, M. Gartner, C. Kruse
      Applied Physics Letters 99, 151101 (2011).           doi.org/10.1063/1.3644955
       
    48. Optical properties of photonic molecules and elliptical pillars made of ZnSe-based microcavities
      K. Sebald, M. Seyfried, S. Klembt, C. Kruse
      Optics Express 19, 19422 (2011).              doi.org/10.1364/OE.19.019422
       
    49. Band gap bowing of binary alloys: Experimental results compared to theoretical tight-binding supercell calculations for Cd x Zn 1− x Se
      D. Mourad, G. Czycholl, C. Kruse, S. Klembt, R. Retzlaff, D. Hommel, M. Gartner, M. Anastasescu
      Physical Review B 82, 165204 (2010).     doi.org/10.1103/PhysRevB.82.165204