Personal Page
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 (12/2020):
- 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
https://arxiv.org/abs/2012.11945 (2020)
- 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)
- 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)
- 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
Phys. Rev. Lett. 126, 075302 (2021). https://doi.org/10.1103/PhysRevLett.126.075302
- 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)
- 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
Adv. Optical Mater. 8, 2000650 (2020). https://doi.org/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
Applied Physics Letters 116, 171103 (2020). https://doi.org/10.1063/5.0007456
- 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)
- 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)
- 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
- 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
Phys. Rev. B 99, 115303 (2019). doi.org/10.1103/PhysRevB.99.115303
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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