@inproceedings{23474,
  author       = {{Reichelt, Matthias and Rose, Hendrik and Kosarev, Alexander N. and Poltavtsev, Sergey V. and Bayer, Manfred and Akimov, Ilya A. and Schneider, Christian and Kamp, Martin and Höfling, Sven and Meier, Torsten}},
  booktitle    = {{Ultrafast Phenomena and Nanophotonics XXV}},
  editor       = {{Betz, Markus and Elezzabi, Abdulhakem Y.}},
  title        = {{{Controlling the emission time of photon echoes by optical freezing of exciton dephasing and rephasing in quantum-dot ensembles}}},
  doi          = {{10.1117/12.2576887}},
  volume       = {{11684}},
  year         = {{2021}},
}

@article{23478,
  author       = {{Rose, Hendrik and Popolitova, D. V. and Tikhonova, O. V. and Meier, Torsten and Sharapova, Polina}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  title        = {{{Dark-state and loss-induced phenomena in the quantum-optical regime of Λ-type three-level systems}}},
  doi          = {{10.1103/physreva.103.013702}},
  volume       = {{103}},
  year         = {{2021}},
}

@article{23473,
  author       = {{Belobo, Didier Belobo and Meier, Torsten}},
  issn         = {{1367-2630}},
  journal      = {{New Journal of Physics}},
  title        = {{{Approximate nonlinear wave solutions of the coupled two-component Gross–Pitaevskii equations with spin–orbit interaction}}},
  doi          = {{10.1088/1367-2630/abf3ed}},
  volume       = {{23}},
  year         = {{2021}},
}

@article{37334,
  abstract     = {{<jats:p>Uniaxial anisotropy in nonlinear birefringent crystals limits the efficiency of nonlinear optical interactions and breaks the spatial symmetry of light generated in the parametric down-conversion (PDC) process. Therefore, this effect is usually undesirable and must be compensated for. However, high gain may be used to overcome the destructive role of anisotropy in order to generate bright two-mode correlated twin-beams. In this work, we provide a rigorous theoretical description of the spatial properties of bright squeezed light in the presence of strong anisotropy. We investigate a single crystal and a system of two crystals with an air gap (corresponding to a nonlinear SU(1,1) interferometer) and demonstrate the generation of bright correlated twin-beams in such configurations at high gain due to anisotropy. We explore the mode structure of the generated light and show how anisotropy, together with crystal spacing, can be used for radiation shaping.</jats:p>}},
  author       = {{Riabinin, M. and Sharapova, Polina and Meier, Torsten}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{14}},
  pages        = {{21876--21890}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Bright correlated twin-beam generation and radiation shaping in high-gain parametric down-conversion with anisotropy}}},
  doi          = {{10.1364/oe.424977}},
  volume       = {{29}},
  year         = {{2021}},
}

@inproceedings{23475,
  author       = {{Rose, Hendrik and Paul, Jagannath and Wahlstrand, Jared K. and Bristow, Alan D. and Meier, Torsten}},
  booktitle    = {{Ultrafast Phenomena and Nanophotonics XXV}},
  editor       = {{Betz, Markus and Elezzabi, Abdulhakem Y.}},
  title        = {{{Theoretical analysis and simulations of two-dimensional Fourier transform spectroscopy performed on exciton-polaritons of a quantum-well microcavity system}}},
  doi          = {{10.1117/12.2576696}},
  volume       = {{11684}},
  year         = {{2021}},
}

@article{37333,
  author       = {{Krauss-Kodytek, L. and Hannes, W.-R. and Meier, Torsten and Ruppert, C. and Betz, M.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{8}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Nondegenerate two-photon absorption in ZnSe: Experiment and theory}}},
  doi          = {{10.1103/physrevb.104.085201}},
  volume       = {{104}},
  year         = {{2021}},
}

@article{21547,
  author       = {{Riabinin, Matvei and Sharapova, Polina and Bartley, Tim and Meier, Torsten}},
  issn         = {{2399-6528}},
  journal      = {{Journal of Physics Communications}},
  number       = {{4}},
  title        = {{{Generating two-mode squeezing with multimode measurement-induced nonlinearity}}},
  doi          = {{10.1088/2399-6528/abeec2}},
  volume       = {{5}},
  year         = {{2021}},
}

@article{23472,
  author       = {{Krauss-Kodytek, L. and Hannes, Wolf-Rüdiger and Meier, Torsten and Ruppert, C. and Betz, M.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{8}},
  title        = {{{Nondegenerate two-photon absorption in ZnSe: Experiment and theory}}},
  doi          = {{10.1103/physrevb.104.085201}},
  volume       = {{104}},
  year         = {{2021}},
}

@article{22883,
  author       = {{Zuo, R and Song, X and Meier, Torsten and Yang, W}},
  issn         = {{1742-6588}},
  journal      = {{Journal of Physics: Conference Series}},
  number       = {{8}},
  title        = {{{Carrier-wave population transfer in semiconductors}}},
  doi          = {{10.1088/1742-6596/1412/8/082005}},
  volume       = {{1412}},
  year         = {{2020}},
}

@article{20773,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Semiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the coherent ensemble dynamics. Control of the echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse photon echo sequence, we apply an additional resonant control pulse with multiple of 2<jats:italic>π</jats:italic> area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses.</jats:p>}},
  author       = {{Kosarev, Alexander N. and Rose, Hendrik and Poltavtsev, Sergey V. and Reichelt, Matthias and Schneider, Christian and Kamp, Martin and Höfling, Sven and Bayer, Manfred and Meier, Torsten and Akimov, Ilya A.}},
  issn         = {{2399-3650}},
  journal      = {{Communications Physics}},
  number       = {{1}},
  title        = {{{Accurate photon echo timing by optical freezing of exciton dephasing and rephasing in quantum dots}}},
  doi          = {{10.1038/s42005-020-00491-2}},
  volume       = {{3}},
  year         = {{2020}},
}

@article{43747,
  abstract     = {{Vortices are topological objects representing the circular motion of a fluid. With their additional degree of freedom, the vorticity, they have been widely investigated in many physical systems and different materials for fundamental interest and for applications in data storage and information processing. Vortices have also been observed in non-equilibrium exciton-polariton condensates in planar semiconductor microcavities. There they appear spontaneously or can be created and pinned in space using ring-shaped optical excitation profiles. However, using the vortex state for information processing not only requires creation of a vortex but also efficient control over the vortex after its creation. Here we demonstrate a simple approach to control and switch a localized polariton vortex between opposite states. In our scheme, both the optical control of vorticity and its detection through the orbital angular momentum of the emitted light are implemented in a robust and practical manner.}},
  author       = {{Meier, Torsten and Ma, Xuekai and Berger, Bernd and Aßmann, Marc and Driben, Rodislav and Schneider, Christian and Höfling, Sven and Schumacher, Stefan}},
  journal      = {{Nature communications}},
  number       = {{1}},
  pages        = {{897}},
  publisher    = {{Nature Publishing Group UK}},
  title        = {{{Realization of all-optical vortex switching in exciton-polariton condensates}}},
  doi          = {{10.1038/s41467-020-14702-5}},
  volume       = {{11}},
  year         = {{2020}},
}

@inproceedings{20770,
  author       = {{Hannes, Wolf-Rüdiger and Meier, Torsten}},
  booktitle    = {{Ultrafast Phenomena and Nanophotonics XXIV}},
  editor       = {{Betz, Markus and Elezzabi, Abdulhakem Y.}},
  isbn         = {{9781510633193}},
  pages        = {{112780S}},
  title        = {{{k.p-based multiband simulations of non-degenerate two-photon absorption in bulk GaAs}}},
  doi          = {{10.1117/12.2545924}},
  volume       = {{11278}},
  year         = {{2020}},
}

@article{20563,
  author       = {{Hannes, W.-R. and Trautmann, Alexander and Stein, M. and Schäfer, F. and Koch, M. and Meier, Torsten}},
  journal      = {{Physical Review B}},
  number       = {{7}},
  pages        = {{075203}},
  publisher    = {{American Physical Society}},
  title        = {{{Strongly nonresonant four-wave mixing in semiconductors}}},
  doi          = {{10.1103/PhysRevB.101.075203}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20772,
  author       = {{Song, Xiaohong and Yang, Shidong and Zuo, Ruixin and Meier, Torsten and Yang, Weifeng}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  title        = {{{Enhanced high-order harmonic generation in semiconductors by excitation with multicolor pulses}}},
  doi          = {{10.1103/physreva.101.033410}},
  volume       = {{101}},
  year         = {{2020}},
}

@article{20580,
  author       = {{Ma, Xuekai and Berger, B and Aßmann, M and Driben, R and Meier, Torsten and Schneider, C and Höfling, S and Schumacher, Stefan}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  number       = {{1}},
  pages        = {{897}},
  title        = {{{Realization of all-optical vortex switching in exciton-polariton condensates}}},
  doi          = {{10.1038/s41467-020-14702-5}},
  volume       = {{11}},
  year         = {{2020}},
}

@article{14544,
  author       = {{Vondran, J. and Spitzer, F. and Bayer, M. and Akimov, I. A. and Trautmann, Alexander and Reichelt, Matthias and Meier, Cedrik and Weber, N. and Meier, Torsten and André, R. and Mariette, H.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{15}},
  pages        = {{155308}},
  title        = {{{Spatially asymmetric transients of propagating exciton-polariton modes in a planar CdZnTe/CdMgTe guiding structure}}},
  doi          = {{10.1103/physrevb.100.155308}},
  volume       = {{100}},
  year         = {{2019}},
}

@article{37288,
  abstract     = {{<jats:p>An integrated chip with quantum state generation, active polarization manipulation, and precise time control is demonstrated.</jats:p>}},
  author       = {{Luo, Kai-Hong and Brauner, Sebastian and Eigner, Christof and Sharapova, Polina and Ricken, Raimund and Meier, Torsten and Herrmann, Harald and Silberhorn, Christine}},
  issn         = {{2375-2548}},
  journal      = {{Science Advances}},
  keywords     = {{Multidisciplinary}},
  number       = {{1}},
  publisher    = {{American Association for the Advancement of Science (AAAS)}},
  title        = {{{Nonlinear integrated quantum electro-optic circuits}}},
  doi          = {{10.1126/sciadv.aat1451}},
  volume       = {{5}},
  year         = {{2019}},
}

@inproceedings{13285,
  author       = {{Hannes, Wolf-Rüdiger and Krauß-Kodytek, Laura and Ruppert, Claudia and Betz, Markus and Meier, Torsten}},
  booktitle    = {{Ultrafast Phenomena and Nanophotonics XXIII}},
  editor       = {{Betz, Markus and Elezzabi, Abdulhakem Y.}},
  isbn         = {{9781510624740}},
  title        = {{{Intensity-dependent degenerate and non-degenerate nonlinear optical absorption of direct-gap semiconductors}}},
  doi          = {{10.1117/12.2503539}},
  volume       = {{10916}},
  year         = {{2019}},
}

@article{13284,
  author       = {{Hannes, Wolf-Rüdiger and Meier, Torsten}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{12}},
  title        = {{{Higher-order contributions and nonperturbative effects in the nondegenerate nonlinear optical absorption of semiconductors using a two-band model}}},
  doi          = {{10.1103/physrevb.99.125301}},
  volume       = {{99}},
  year         = {{2019}},
}

@inproceedings{43748,
  abstract     = {{The fundamental interband absorption in gallium arsenide shows a strong blue shift when biased by mid-infrared transients exceeding 10 MV/cm. This subcycle feature is induced by the localization of electronic wavefunctions from 3D to 2D.}},
  author       = {{Meier, Torsten and Bühler, Johannes and Schmidt, Christian and Heinrich, Alexander-Cornelius and Allerbeck, Jonas and Podzimski, Reinold and Berghoff, Daniel and Schmidt, Wolf Gero and Reichl, Christian and Wegscheider, Werner and Brida, Daniele and Leitenstorfer, Alfred}},
  booktitle    = {{XXI International Conference on Ultrafast Phenomena 2018 (UP 2018)}},
  publisher    = {{EDP Sciences}},
  title        = {{{Subcycle Wannier-Stark Localization by Mid-Infrared Bias in Gallium Arsenide}}},
  doi          = {{10.1051/epjconf/201920505001}},
  volume       = {{205}},
  year         = {{2019}},
}