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Deutsch Intern
    Technische Physik

    Prof. Dr. Sebastian Klembt

    Prof. Dr. Sebastian Klembt

    Juniorprofessor – Light-Matter Interaction and Topological Photonics
    Group Leader
    Technische Physik
    University of Würzburg
    Am Hubland
    97074 Würzburg
    Germany
    Building: P1 (Physik)
    Room: A022

    Google Scholar: Account

    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.

    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

    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

    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

    Optical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths
    Ł. Dusanowski, C. Nawrath, S. L. Portalupi, M. Jetter, T. Huber, S. Klembt, P. Michler, and S. Höfling
    Nat. Commun. 13, 748 (2022), DOI: 10.1038/s41467-022-28328-2

    Electro-optical Switching of a Topological Polariton Laser
    P. Gagel, T. H. Harder, S. Betzold, O. A. Egorov, J. Beierlein, H. Suchomel, M. Emmerling, A. Wolf, U. Peschel, S. Höfling, C. Schneider, and S. Klembt
    ACS Photonics 9, 405 (2022), DOI: 10.1021/acsphotonics.1c01605

    Topologischer Laser mit vertikalen Resonatoren
    T. H. Harder, S. Höfling, and S. Klembt
    Phys. Unserer Zeit 53, 6 (2022), DOI: 10.1002/piuz.202270104

    Polariton condensates for classical and quantum computing
    A. Kavokin, T. C. H. Liew, C. Schneider, P. G. Lagoudakis, S. Klembt, and S. Höfling
    Nat. Rev. Phys. 4, 435 (2022), DOI: 10.1038/s42254-022-00447-1

    Crossover from exciton-polariton condensation to photon lasing in an optical trap
    M. Pieczarka, D. Biegańska, C. Schneider, S. Höfling, S. Klembt, G. Sęk, and M. Syperek
    Opt. Express 30, 17070 (2022), DOI: 10.1364/OE.452918

    Brightening of a dark monolayer semiconductor via strong light-matter coupling in a cavity
    H. Shan, I. Iorsh, B. Han, C. Rupprecht, H. Knopf, F. Eilenberger, M. Esmann, K. Yumigeta, K. Watanabe, T. Taniguchi, S. Klembt, S. Höfling, S. Tongay, C. Antón-Solanas, I. A. Shelykh, and C. Schneider
    Nat. Commun. 13, 3001 (2022), DOI: 10.1038/s41467-022-30645-5

    Bosonic condensation of exciton-polaritons in an atomically thin crystal
    C. Antón-Solanas, M. Waldherr, M. Klaas, H. Suchomel, T. H. Harder, H. Cai, E. Sedov, S. Klembt, A. V. Kavokin, S. Tongay, K. Watanabe, T. Taniguchi, S. Höfling, and C. Schneider
    Nat. Mater. 20, 1233 (2021), DOI: 10.1038/s41563-021-01000-8

    Bloch Oscillations of Hybrid Light‐Matter Particles in a Waveguide Array
    J. Beierlein, O. A. Egorov, T. H. Harder, P. Gagel, M. Emmerling, C. Schneider, S. Höfling, U. Peschel, and S. Klembt
    Adv. Opt. Mater. 9, 2100126 (2021), DOI: 10.1002/adom.202100126

    Propagative Oscillations in Codirectional 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. Höfling, and S. Klembt
    Phys. Rev. Lett. 126, 75302 (2021), DOI: 10.1103/PhysRevLett.126.075302

    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, 1514 (2021), DOI: 10.1126/science.abj2232

    Room-Temperature Topological Polariton Laser in an Organic Lattice
    M. Dusel, S. Betzold, T. H. Harder, M. Emmerling, J. Beierlein, J. Ohmer, U. Fischer, R. Thomale, C. Schneider, S. Höfling, and S. Klembt
    Nano Lett. 21, 6398 (2021), DOI: 10.1021/acs.nanolett.1c00661

    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
    ACS Photonics 8, 3193 (2021), DOI: 10.1021/acsphotonics.1c00950

    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
    ACS Photonics 8, 1377 (2021), DOI: 10.1021/acsphotonics.0c01958

    Light detection nears its quantum limit
    S. Klembt
    Nature 597, 483 (2021), DOI: 10.1038/d41586-021-02489-4

    Effects of the Linear Polarization of Polariton Condensates in Their Propagation in Codirectional Couplers
    E. Rozas, A. Yulin, J. Beierlein, S. Klembt, S. Höfling, O. A. Egorov, U. Peschel, I. A. Shelykh, M. Gundin, I. Robles-López, M. D. Martín, and L. Viña
    ACS Photonics 8, 2489 (2021), DOI: 10.1021/acsphotonics.1c00746

    Spatial coherence of room-temperature monolayer WSe2 exciton-polaritons in a trap
    H. Shan, L. Lackner, B. Han, E. Sedov, C. Rupprecht, H. Knopf, F. Eilenberger, J. Beierlein, N. Kunte, M. Esmann, K. Yumigeta, K. Watanabe, T. Taniguchi, S. Klembt, S. Höfling, A. V. Kavokin, S. Tongay, C. Schneider, and C. Antón-Solanas
    Nat. Commun. 12, 6406 (2021), DOI: 10.1038/s41467-021-26715-9

    Topological Defect Engineering and PT Symmetry in Non-Hermitian Electrical Circuits
    A. Stegmaier, S. Imhof, T. Helbig, T. Hofmann, C. H. Lee, M. Kremer, A. Fritzsche, T. Feichtner, S. Klembt, S. Höfling, I. Boettcher, I. C. Fulga, L. Ma, O. G. Schmidt, M. Greiter, T. Kiessling, A. Szameit, and R. Thomale
    Phys. Rev. Lett. 126, 215302 (2021), DOI: 10.1103/PhysRevLett.126.215302

    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 (2020), DOI: 10.1021/acsphotonics.9b01300

    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
    Nat. Commun. 11, 2863 (2020), DOI: 10.1038/s41467-020-16656-0

    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
    Phys. Rev. B 102, 121302 (2020), DOI: 10.1103/PhysRevB.102.121302

    Impact of the Energetic Landscape on Polariton Condensates' Propagation along a Coupler
    E. Rozas, J. Beierlein, A. Yulin, M. Klaas, H. Suchomel, O. A. Egorov, I. A. Shelykh, U. Peschel, C. Schneider, S. Klembt, S. Höfling, M. D. Martín, and L. Viña
    Adv. Opt. Mater. 8, 2000650 (2020), DOI: 10.1002/adom.202000650

    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
    Appl. Phys. Lett. 116, 171103 (2020), DOI: 10.1063/5.0007456

    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, and C. Schneider
    Appl. Phys. Lett. 114, 61102 (2019), DOI: 10.1063/1.5067247

    Nonresonant spin selection methods and polarization control in exciton-polariton condensates
    M. Klaas, O. A. Egorov, T. C. H. Liew, A. V. Nalitov, V. Marković, H. Suchomel, T. H. Harder, S. Betzold, E. A. Ostrovskaya, A. V. Kavokin, S. Klembt, S. Höfling, and C. Schneider
    Phys. Rev. B 99, 115303 (2019), DOI: 10.1103/PhysRevB.99.115303

    Topologischer Isolator aus Licht und Materie
    S. Klembt, T. H. Harder, and S. Höfling
    Phys. Unserer Zeit 50, 11 (2019), DOI: 10.1002/piuz.201970107

    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, Y. Qin, S. Tongay, M. Richard, A. V. Kavokin, S. Höfling, and C. Schneider
    Nat. Nanotechnol. 14, 770 (2019), DOI: 10.1038/s41565-019-0492-0

    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. V. Kavokin, S. Höfling, F. Eilenberger, and C. Schneider
    Phys. Rev. B 100, 121303 (2019), DOI: 10.1103/PhysRevB.100.121303

    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
    Phys. Rev. B 99, 45302 (2019), DOI: 10.1103/PhysRevB.99.045302

    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, and S. Höfling
    Phys. Rev. Lett. 120, 17401 (2018), DOI: 10.1103/PhysRevLett.120.017401

    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, and S. Höfling
    Nature 562, 552 (2018), DOI: 10.1038/s41586-018-0601-5

    Thermal Decoherence of a Nonequilibrium Polariton Fluid
    S. Klembt, P. Stepanov, T. Klein, A. Minguzzi, and M. Richard
    Phys. Rev. Lett. 120, 35301 (2018), DOI: 10.1103/PhysRevLett.120.035301

    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, and C. Schneider
    Phys. Rev. Lett. 121, 257402 (2018), DOI: 10.1103/PhysRevLett.121.257402

    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. V. Nalitov, E. Cherotchenko, H. Cai, E. A. Ostrovskaya, A. V. Kavokin, S. Tongay, S. Klembt, S. Höfling, and C. Schneider
    Nat. Commun. 9, 3286 (2018), DOI: 10.1038/s41467-018-05532-7

    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, and S. Höfling
    Appl. Phys. Lett. 110, 151103 (2017), DOI: 10.1063/1.4979836

    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, and S. Höfling
    Phys. Rev. B 96 (2017), DOI: 10.1103/PhysRevB.96.041301

    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, and S. Höfling
    Appl. Phys. Lett. 111, 231102 (2017), DOI: 10.1063/1.4995385

    Valley polarized relaxation and upconversion luminescence from Tamm-plasmon trion–polaritons with a MoSe 2 monolayer
    N. Lundt, P. Nagler, A. V. Nalitov, S. Klembt, M. Wurdack, S. Stoll, T. H. Harder, S. Betzold, V. Baumann, A. V. Kavokin, C. Schüller, T. Korn, S. Höfling, and C. Schneider
    2d Mater. 4, 25096 (2017), DOI: 10.1088/2053-1583/aa6ef2

    Observation of macroscopic valley-polarized monolayer exciton-polaritons at room temperature
    N. Lundt, S. Stoll, P. Nagler, A. V. Nalitov, S. Klembt, S. Betzold, J. Goddard, E. Frieling, A. V. Kavokin, C. Schüller, T. Korn, S. Höfling, and C. Schneider
    Phys. Rev. B 96 (2017), DOI: 10.1103/PhysRevB.96.241403

    Tunable Bragg polaritons and nonlinear emission from a hybrid metal-unfolded ZnSe-based microcavity
    S. S. Rahman, T. Klein, J. Gutowski, S. Klembt, and K. Sebald
    Sci. Rep. 7, 767 (2017), DOI: 10.1038/s41598-017-00878-2

    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, and C. Schneider
    Sci. Rep. 7, 5114 (2017), DOI: 10.1038/s41598-017-05277-1

    Exciton-polariton flows in cross-dimensional junctions
    K. Winkler, H. Flayac, S. Klembt, A. Schade, D. Nevinskiy, M. Kamp, C. Schneider, and S. Höfling
    Phys. Rev. B 95 (2017), DOI: 10.1103/PhysRevB.95.201302

    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, and C. Schneider
    Nat. Commun. 7, 13328 (2016), DOI: 10.1038/ncomms13328

    Observation of a hybrid state of Tamm plasmons and microcavity exciton polaritons
    S. S. Rahman, T. Klein, S. Klembt, J. Gutowski, D. Hommel, and K. Sebald
    Sci. Rep. 6, 34392 (2016), DOI: 10.1038/srep34392

    Bragg polaritons in a ZnSe-based unfolded microcavity at elevated temperatures
    K. Sebald, S. S. Rahman, M. Cornelius, T. Kaya, J. Gutowski, T. Klein, A. Gust, D. Hommel, and S. Klembt
    Appl. Phys. Lett. 108, 121105 (2016), DOI: 10.1063/1.4944717

    Tamm plasmon polaritons in the visible spectral region and its optical properties in ZnSe-based microcavities
    S. K. Shaid-Ur Rahman, K. Sebald, J. Gutowski, T. Klein, S. Klembt, C. Kruse, and D. Hommel
    Phys. Status Solidi C 13, 498 (2016), DOI: 10.1002/pssc.201510296

    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, and C. Kruse
    J. Appl. Phys. 117, 113106 (2015), DOI: 10.1063/1.4915625

    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, and M. Richard
    Phys. Rev. Lett. 114, 186403 (2015), DOI: 10.1103/PhysRevLett.114.186403

    Tailoring the optical properties of wide-bandgap based microcavities via metal films
    K. Sebald, S. S. Rahman, M. Cornelius, J. Gutowski, T. Klein, S. Klembt, C. Kruse, and D. Hommel
    Appl. Phys. Lett. 107, 62101 (2015), DOI: 10.1063/1.4928604

    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, D. Le Si Dang, and M. Richard
    Phys. Status Solidi C 11, 1267 (2014), DOI: 10.1002/pssc.201300705

    II-VI-basierte Mikroaktivitäten für den blau-violetten Spektralbereich. Lasing im Bereich schwacher und starker Kopplung
    Zugl.: Bremen, Univ., Diss., 2013
    S. Klembt
    mbv Mensch-und-Buch-Verl., Berlin (2014)

    On the structural properties of MgS-rich II–VI-based microcavities
    S. Klembt, K. Frank, G. Qian, T. Klein, A. Rosenauer, D. Hommel, and C. Kruse
    J. Cryst. Growth 378, 270 (2013), DOI: 10.1016/j.jcrysgro.2012.12.003

    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, and J. Gutowski
    Phys. Status Solidi C 10, 1230 (2013), DOI: 10.1002/pssc.201200745

    Blue monolithic II-VI-based vertical-cavity surface-emitting laser
    S. Klembt, M. Seyfried, T. Aschenbrenner, K. Sebald, J. Gutowski, D. Hommel, and C. Kruse
    Appl. Phys. Lett. 100, 121102 (2012), DOI: 10.1063/1.3696029

    Strong coupling in monolithic microcavities with ZnSe quantum wells
    K. Sebald, M. Seyfried, S. Klembt, S. Bley, A. Rosenauer, D. Hommel, and C. Kruse
    Appl. Phys. Lett. 100, 161104 (2012), DOI: 10.1063/1.4704188

    High-reflectivity II-VI-based distributed Bragg reflectors for the blue-violet spectral range
    S. Klembt, H. Dartsch, M. Anastasescu, M. Gartner, and C. Kruse
    Appl. Phys. Lett. 99, 151101 (2011), DOI: 10.1063/1.3644955

    Optical properties of photonic molecules and elliptical pillars made of ZnSe-based microcavities
    K. Sebald, M. Seyfried, S. Klembt, and C. Kruse
    Opt. Express, OE 19, 19422 (2011), DOI: 10.1364/OE.19.019422

    Optical polariton properties in ZnSe-based planar and pillar structured microcavities
    K. Sebald, A. A. P. Trichet, M. Richard, L. S. Dang, M. Seyfried, S. Klembt, C. Kruse, and D. Hommel
    Eur. Phys. J. B 84, 381 (2011), DOI: 10.1140/epjb/e2011-20551-9

    Band gap bowing of binary alloys: Experimental results compared to theoretical tight-binding supercell calculations for CdxZn1−xSe
    D. Mourad, G. Czycholl, C. Kruse, S. Klembt, R. Retzlaff, D. Hommel, M. Gartner, and M. Anastasescu
    Phys. Rev. B Condens. Matter Mater. Phys. 82, 165204 (2010), DOI: 10.1103/PhysRevB.82.165204