Now showing items 1-20 of 100

  • Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas 

    Nitsche, W.H.; Kim, N.Y.; Roumpos, G.; Schneider, C.; Kamp, M.; Höfling, S.; Forchel, A.; Yamamoto, Y. (2014-11-24) - Journal article
    We observe quasi-long-range coherence in a two-dimensional condensate of exciton-polaritons. Our measurements confirm that the spatial correlation algebraically decays with a slow power law, whose exponent quantitatively ...
  • All-optical flow control of a polariton condensate using nonresonant excitation 

    Schmutzler, J.; Lewandowski, P.; Aßmann, M.; Niemietz, D.; Schumacher, S.; Kamp, M.; Schneider, C.; Höfling, S.; Bayer, M. (2015-05-11) - Journal article
    The precise adjustment of the polariton condensate flow under incoherent excitation conditions is an indispensable prerequisite for polariton-based logic gate operations. In this report, an all-optical approach for steering ...
  • Anomalies of a nonequilibrium spinor polariton condensate in a magnetic field 

    Fischer, J.; Brodbeck, S.; Chernenko, A. V.; Lederer, I.; Rahimi-Iman, A.; Amthor, M.; Kulakovskii, V. D.; Worschech, L.; Kamp, M.; Durnev, M.; Schneider, C.; Kavokin, A. V.; Hoefling, S. (2014-03-06) - Journal article
    We observe a strong variation of the Zeeman splitting of exciton polaritons in microcavities when switching between the linear regime, the polariton lasing, and photon lasing regimes. In the polariton lasing regime the ...
  • Associative learning with Y-shaped floating gate transistors operated in memristive modes 

    Maier, P.; Hartmann, F.; Emmerling, M.; Schneider, C.; Kamp, M.; Worschech, L.; Höfling, S. (2017-02-03) - Journal article
    We present Y-shaped three-terminal floating gate transistors with positioned quantum dots (QDs) acting as floating gates. The QDs are precisely positioned in the input terminals and the localized charge controls the ...
  • Broadband indistinguishability from bright parametric downconversion in a semiconductor waveguide 

    Günthner, T.; Pressl, B.; Laiho, K.; Geßler, J.; Höfling, Sven; Kamp, M.; Schneider, C.; Weihs, G. (2015-10-08) - Journal article
    Parametric downconversion (PDC) in semiconductor Bragg-reflection waveguides (BRW) is routinely exploited for photon-pair generation in the telecommunication range. Contrary to many conventional PDC sources, BRWs offer ...
  • Carrier transfer between confined and localized states in type II InAs/GaAsSb quantum wells 

    Dyksik, M.; Motyka, M.; Weih, R.; Höfling, S.; Kamp, M.; Sęk, G.; Misiewicz, J. (2017-02) - Journal article
    Temperature-resolved photoluminescence studies were performed on tensely-strained AlSb/InAs/GaAsSb W-shaped type II quantum wells. They revealed two emission bands: one at lower energy of localized origin resulting from ...
  • Charged quantum dot micropillar system for deterministic light-matter interactions 

    Androvitsaneas, P.; Young, A. B.; Schneider, C.; Maier, S.; Kamp, M.; Höfling, S.; Knauer, S.; Harbord, E.; Hu, C. Y.; Rarity, J. G.; Oulton, R. (2016-06-21) - Journal article
    Quantum dots (QDs) are semiconductor nanostructures in which a three-dimensional potential trap produces an electronic quantum confinement, thus mimicking the behavior of single atomic dipole-like transitions. However, ...
  • Charging dynamics of a floating gate transistor with site-controlled quantum dots 

    Maier, P.; Hartmann, F.; Emmerling, M.; Schneider, C.; Höfling, S.; Kamp, M.; Worschech, L. (2014-08-04) - Journal article
    A quantum dot memory based on a GaAs/AlGaAs quantum wire with site-controlled InAs quantum dots was realized by means of molecular beam epitaxy and etching techniques. By sampling of different gate voltage sweeps for the ...
  • Circular and linear photogalvanic effects in type-II GaSb/InAs quantum well structures in the inverted regime 

    Plank, H.; Tarasenko, S. A.; Hummel, T.; Knebl, G.; Pfeffer, P.; Kamp, M.; Höfling, S.; Ganichev, S. D. (2017-01) - Journal article
    We report on the observation of photogalvanic effects induced by terahertz radiation in type-II GaSb/InAs quantum wells with inverted band order. Photocurrents are excited at oblique incidence of radiation and consists of ...
  • Circularly polarized lasing in chiral modulated semiconductor microcavity with GaAs quantum wells 

    Demenev, A. A.; Kulakovskii, V. D.; Schneider, C.; Brodbeck, S.; Kamp, M.; Höfling, S.; Lobanov, S. V.; Weiss, T.; Gippius, N. A.; Tikhodeev, S. G. (2016-10-24) - Journal article
    We report close to circularly polarized lasing at ћω = 1.473 and 1.522 eV from an AlAs/AlGaAs Bragg microcavity, with 12 GaAs quantum wells in the active region and chirally etched upper distributed Bragg refractor under ...
  • Coherence dynamics and quantum-to-classical crossover in an exciton-cavity system in the quantum strong coupling regime 

    Kasprzak, J.; Sivalertporn, K.; Albert, F.; Schneider, C.; Höfling, Sven; Kamp, M.; Forchel, A.; Reitzenstein, S.; Muljarov, E. A.; Langbein, W. (2013-04-22) - Journal article
    Interaction between light and matter generates optical nonlinearities, which are particularly pronounced in the quantum strong coupling regime. When a single bosonic mode couples to a single fermionic mode, a Jaynes-Cummings ...
  • Collective state transitions of exciton-polaritons loaded into a periodic potential 

    Winkler, K.; Egorov, O. A.; Savenko, I. G.; Ma, X.; Estrecho, E.; Gao, T.; Müller, S.; Kamp, M.; Liew, T. C. H.; Ostrovskaya, E. A.; Höfling, Sven; Schneider, C. (2016-03-15) - Journal article
    We study the loading of a nonequilibrium, dissipative system of composite bosons - exciton polaritons - into a one dimensional periodic lattice potential. Utilizing momentum resolved photoluminescence spectroscopy, we ...
  • Compensation of phonon-induced renormalization of vacuum Rabi splitting in large quantum dots : towards temperature-stable strong coupling in the solid state with quantum dot-micropillars 

    Hopfmann, C.; Musiał, A; Strauss, M.; Barth, A. M.; Glässl, M.; Vagov, A.; Strauss, M.; Schneider, C.; Hoefling, Sven; Kamp, M.; Axt, V. M.; Reitzenstein, S. (2015-12-03) - Journal article
    We study experimentally the influence of temperature on the emission characteristics of quantum dot-micropillars in the strong coupling regime of cavity quantum electrodynamics (cQED). In particular, we investigate its ...
  • Controlling circular polarization of light emitted by quantum dots using chiral photonic crystal slabs 

    Lobanov, S. V.; Tikhodeev, S. G.; Gippius, N. A.; Gippius, N. A.; Maksimov, A. A.; Filatov, E. V.; Tartakovskii, I. I.; Kulakovskii, V. D.; Weiss, T.; Schneider, C.; Gessler, J.; Kamp, M.; Hoefling, Sven (2015-11-23) - Journal article
    We study the polarization properties of light emitted by quantum dots that are embedded in chiral photonic crystal structures made of achiral planar GaAs waveguides. A modification of the electromagnetic mode structure due ...
  • Correlations between axial and lateral emission of coupled quantum dot-micropillar cavities 

    Musiał, A.; Hopfmann, C.; Heindel, T.; Gies, C.; Florian, M.; Leymann, H. A. M.; Foerster, A.; Schneider, C.; Jahnke, F.; Höfling, S.; Kamp, M.; Reitzenstein, S. (2015-05-19) - Journal article
    We report on optical studies of coupled quantum dot–micropillar cavities using a 90∘ excitation-and-detection scheme. This specific configuration allows us to excite the micropillar structures either in the axial direction ...
  • Coupling polariton quantum boxes in sub-wavelength grating microcavities 

    Zhang, B.; Brodbeck, S.; Wang, Z.; Kamp, M.; Schneider, C.; Höfling, S.; Deng, H. (2015-02-02) - Journal article
    We report the construction of decoupled, coupled, and quasi-one dimensional polariton systems from zero dimensional polariton quantum boxes using microcavities with sub-wavelength gratings as the top mirror. By designing ...
  • Creation of orbital angular momentum states with chiral polaritonic lenses 

    Dall, R.; Fraser, M.D.; Desyatnikov, A.S.; Li, G.; Brodbeck, S.; Kamp, M.; Schneider, C.; Höfling, S.; Ostrovskaya, E.A. (2014-11-12) - Journal article
    Controlled transfer of orbital angular momentum to an exciton-polariton Bose-Einstein condensate spontaneously created under incoherent, off resonant excitation conditions is a long-standing challenge in the field of ...
  • Determination of operating parameters for a GaAs-based polariton laser 

    Schmutzler, J.; Veit, F.; Assmann, M.; Tempel, J. -S.; Höfling, Sven; Kamp, M.; Forchel, A.; Bayer, M. (2013-02-25) - Journal article
    We report on a systematic study of the phase transitions to polariton condensation (PC) and further to cavity lasing in a GaAs-based microcavity with respect to exciton-cavity detuning and lattice temperature. Using far ...
  • Deterministic and robust generation of single photons from a single quantum dot with 99.5% indistinguishability using adiabatic rapid passage 

    Wei, Y.-J.; He, Y.-M.; Chen, M.-C.; Hu, Y.-N.; He, Y.; Wu, D.; Schneider, C.; Kamp, M.; Höfling, S.; Lu, C.-Y.; Pan, J.-W. (2014-11-12) - Journal article
    Single photons are attractive candidates of quantum bits (qubits) for quantum computation and are the best messengers in quantum networks. Future scalable, fault-tolerant photonic quantum technologies demand both stringently ...
  • Direct fiber-coupled single photon source based on a photonic crystal waveguide 

    Ahn, B.-H.; Lee, C.-M.; Lim, H.-J.; Schlereth, T.W.; Kamp, M.; Höfling, Sven; Lee, Y.-H. (2015-08-24) - Journal article
    A single photon source plays a key role in quantum applications such as quantum computers and quantum communications. Epitaxially grown quantum dots are one of the promising platforms to implement a good single photon ...