@inproceedings{43189, abstract = {{The nonlinear optical response of quantum well excitons is investigated experimentally using polarization resolved four wave mixing, optical-pump optical-probe, and optical-pump Terahertz-probe spectroscopy. The four-wave mixing data reveal clear signatures of coherent biexcitons which concur with straight-forward polarization selection rules at the Γ point. The type-I samples show the well-established time-domain beating signatures in the transients as well as the corresponding spectral signatures clearly. The latter are also present in type-II samples; however, the smaller exciton and biexciton binding energies in these structures infer longer beating times which, in turn, are accompanied by faster dephasing of the type-II exciton coherences. Furthermore, the THz absorption following spectrally narrow, picosecond excitation at energies in the vicinity of the 1s exciton resonance are discussed. Here, the optical signatures yield the well-established redshifts and blueshifts for the appropriate polarization geometries in type-I quantum well samples also termed “AC Stark Effect”. The THz probe reveals intriguing spectral features which can be ascribed to coherent negative absorption following an excitation into a virtual state for an excitation below the 1s exciton resonance. Furthermore, the scattering and ionization of excitons is discussed for several excitation geometries yielding control rules for elastic and inelastic quasiparticle collisions.}}, author = {{Meier, Torsten and Stein, M. and Schäfer, F. and Anders, D. and Littmann, J. H. and Fey, M. and Trautmann, Alexander and Ngo, C. and Steiner, J. T. and Reichelt, Matthias and Fuchs, C. and Volz, K. and Chatterjee, S.}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXVII}}, publisher = {{SPIE }}, title = {{{Experimental studies of the excitonic nonlinear response of GaAs-based type-I and type-II quantum well structures interacting with optical and terahertz fields}}}, doi = {{10.1117/12.2650291}}, volume = {{12419}}, year = {{2023}}, } @inproceedings{43191, abstract = {{Anomalous currents refer to electronic currents that flow perpendicularly to the direction of the accelerating electric field. Such anomalous currents can be generated when Terahertz fields are applied after an optical interband excitation of GaAs quantum wells. The underlying processes are investigated by numerical solutions of the semiconductor Bloch equations in the length gauge. Excitonic effects are included by treating the manybody Coulomb interaction in time-dependent Hartree-Fock approximation and additionally also carrier-phonon scattering processes are considered. The band structure and matrix elements are obtained from a 14-band k · p model within the envelope function approximation. The random phase factors of the matrix elements that appear due to the separate numerical diagonalization at each k-point are treated by applying a smooth gauge transformation. We present the macroscopic Berry curvature and anomalous current transients with and without excitonic effects. It is demonstrated that the resonant optical excitation of excitonic resonances can significantly enhance the Berry curvature and the anomalous currents.}}, author = {{Meier, Torsten and Ngo, C. and Priyadarshi, S. and Duc, H. T. and Bieler, M.}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXVII}}, publisher = {{SPIE}}, title = {{{Terahertz-induced anomalous currents following the optical excitation of excitons in semiconductor quantum wells}}}, doi = {{10.1117/12.2646022}}, volume = {{12419}}, year = {{2023}}, } @inproceedings{43190, abstract = {{The nonlinear optical response of quantum well excitons excited by optical fields is analyzed by numerical solutions of the semiconductor Bloch equations. Differential absorption spectra are computed for resonant pumping at the exciton resonance and the dependence of the absorption changes on the polarization directions of the pump and probe pulses is investigated. Coherent biexcitonic many-body correlations are included in our approach up to third-order in the optical fields. Results are presented for spatially-direct type-I and spatiallyindirect type-II quantum well systems. Due to the spatial inhomogeneity, in type-II structures a finite coupling between excitons of opposite spins exists already on the Hartree-Fock level and contributes to the absorption changes for the case of opposite circularly polarized pump and probe pulses.}}, author = {{Meier, Torsten and Trautmann, Alexander and Stein, M. and Schäfer, F. and Anders, D. and Ngo, C. and Steiner, J. T. and Reichelt, Matthias and Chatterjee, S.}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXVII}}, publisher = {{SPIE}}, title = {{{Analysis of the nonlinear optical response of excitons in type-I and type-II quantum wells including many-body correlations}}}, doi = {{10.1117/12.2650169}}, volume = {{12419}}, year = {{2023}}, } @article{43139, author = {{Meier, Torsten and Schäfer, F. and Stein, M. and Lorenz, J. and Dobener, F. and Ngo, C. and Steiner, J. T. and Fuchs, C. and Stolz, W. and Volz, K. and Hader, J. and Moloney, J.V. and Koch, S.W. and Chatterjee, S.}}, journal = {{Applied Physics Letters}}, number = {{8}}, title = {{{Gain recovery dynamics in active type-II semiconductor heterostructures}}}, doi = {{10.1063/5.0128777}}, volume = {{122}}, year = {{2023}}, } @unpublished{43132, author = {{Meier, Torsten and Grisard, S. and Trifonov, A.V. and Rose, Hendrik and Reichhardt, R. and Reichelt, Matthias and Schneider, C. and Kamp, M. and Höfling, S. and Bayer, M. and Akimov, I.A}}, booktitle = {{arxiv:2302.02480}}, title = {{{Temporal sorting of optical multi-wave-mixing processes in semiconductor quantum dots}}}, year = {{2023}}, } @article{44050, author = {{Sperling, Jan and Agudelo, Elizabeth}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, number = {{4}}, publisher = {{American Physical Society (APS)}}, title = {{{Entanglement of particles versus entanglement of fields: Independent quantum resources}}}, doi = {{10.1103/physreva.107.042420}}, volume = {{107}}, year = {{2023}}, } @article{40477, author = {{Sperling, Jan and Gianani, Ilaria and Barbieri, Marco and Agudelo, Elizabeth}}, issn = {{2469-9926}}, journal = {{Physical Review A}}, number = {{1}}, publisher = {{American Physical Society (APS)}}, title = {{{Detector entanglement: Quasidistributions for Bell-state measurements}}}, doi = {{10.1103/physreva.107.012426}}, volume = {{107}}, year = {{2023}}, } @article{42973, author = {{Lüders, Carolin and Pukrop, Matthias and Barkhausen, Franziska and Rozas, Elena and Schneider, Christian and Höfling, Sven and Sperling, Jan and Schumacher, Stefan and Aßmann, Marc}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{General Physics and Astronomy}}, number = {{11}}, publisher = {{American Physical Society (APS)}}, title = {{{Tracking Quantum Coherence in Polariton Condensates with Time-Resolved Tomography}}}, doi = {{10.1103/physrevlett.130.113601}}, volume = {{130}}, year = {{2023}}, } @book{44083, author = {{Bauer, Anna Brigitte}}, isbn = {{978-3-8325-5625-9}}, publisher = {{Logos Verlag Berlin GmbH}}, title = {{{Experimentelle Kompetenz Physikstudierender. Entwicklung und erste Erprobung eines performanzorientierten Kompetenzstrukturmodells unter Nutzung qualitativer Methoden}}}, doi = {{10.30819/5625}}, volume = {{352}}, year = {{2023}}, } @article{44044, abstract = {{Dispersion is present in every optical setup and is often an undesired effect, especially in nonlinear-optical experiments where ultrashort laser pulses are needed. Typically, bulky pulse compressors consisting of gratings or prisms are used to address this issue by precompensating the dispersion of the optical components. However, these devices are only able to compensate for a part of the dispersion (second-order dispersion). Here, we present a compact pulse-shaping device that uses plasmonic metasurfaces to apply an arbitrarily designed spectral phase delay allowing for a full dispersion control. Furthermore, with specific phase encodings, this device can be used to temporally reshape the incident laser pulses into more complex pulse forms such as a double pulse. We verify the performance of our device by using an SHG-FROG measurement setup together with a retrieval algorithm to extract the dispersion that our device applies to an incident laser pulse.}}, author = {{Geromel, René and Georgi, Philip and Protte, Maximilian and Lei, Shiwei and Bartley, Tim and Huang, Lingling and Zentgraf, Thomas}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, keywords = {{Mechanical Engineering, Condensed Matter Physics, General Materials Science, General Chemistry, Bioengineering}}, number = {{8}}, pages = {{3196 -- 3201}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Compact Metasurface-Based Optical Pulse-Shaping Device}}}, doi = {{10.1021/acs.nanolett.2c04980}}, volume = {{23}}, year = {{2023}}, } @inbook{45171, author = {{Weiler, David and Burde, Jan-Philipp and Große-Heilmann, Rike Isabel and Lachner, Andreas and Riese, Josef and Schubatzky, Thomas}}, booktitle = {{Lehr-Lern-Labore und Digitalisierung}}, editor = {{Meier, Monique and Greefrath, Gilbert and Hammann, Marcus and Wodzinski, Rita and Ziepprecht, Kathrin}}, isbn = {{9783658401085}}, issn = {{2524-8677}}, pages = {{47--62}}, publisher = {{Springer Fachmedien Wiesbaden}}, title = {{{Förderung von digitalisierungsbezogenen Kompetenzen von angehenden Physiklehrkräften mit dem SQD-Modell im Projekt DiKoLeP}}}, doi = {{10.1007/978-3-658-40109-2_4}}, year = {{2023}}, } @article{45485, author = {{Kruse, Stephan and Serino, Laura and Folge, Patrick Fabian and Echeverria Oviedo, Dana and Bhattacharjee, Abhinandan and Stefszky, Michael and Scheytt, J. Christoph and Brecht, Benjamin and Silberhorn, Christine}}, issn = {{1041-1135}}, journal = {{IEEE Photonics Technology Letters}}, keywords = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}}, number = {{14}}, pages = {{769--772}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{A Pulsed Lidar System With Ultimate Quantum Range Accuracy}}}, doi = {{10.1109/lpt.2023.3277515}}, volume = {{35}}, year = {{2023}}, } @inproceedings{45576, author = {{Zwick, Linda and Webersen, Yvonne and Wodzinski, Rita}}, booktitle = {{Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022}}, editor = {{van Vorst, Helena}}, pages = {{746--749}}, title = {{{Entwicklung von Schülervorstellungen zu NOS & NOSI im Physikunterricht}}}, year = {{2023}}, } @inproceedings{45563, author = {{Große-Heilmann, Rike Isabel and Burde, Jan-Philipp and Riese, Josef and Schubatzky, Thomas and Weiler, David}}, booktitle = {{Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022}}, editor = {{van Vorst, Helena}}, pages = {{107--110}}, title = {{{Erwerb und Messung fachdidaktischen Wissens zum Einsatz digitaler Medien}}}, year = {{2023}}, } @inproceedings{45566, author = {{Jordans, Melanie and Riese, Josef}}, booktitle = {{Lernen, Lehren und Forschen in einer digital geprägten Welt Gesellschaft für Didaktik der Chemie und Physik Jahrestagung in Aachen 2022}}, editor = {{van Vorst, Helena}}, pages = {{794--797}}, title = {{{Unterrichtsplanung mit sinnvoller Einbettung digitaler Medien im PU}}}, year = {{2023}}, } @inproceedings{43192, abstract = {{The nonlinear optical response of an ensemble of semiconductor quantum dots is analyzed by wave-mixing processes, where we focus on four-wave mixing with two incident pulses. Wave-mixing experiments are often described with semiclassical models, where the light is modeled classically and the material quantum mechanically. Here, however, we use a fully quantized model, where the light is given by a quantum state of light. Quantum light involves more degrees of freedom than classical light as e.g., its photon statistics and quantum correlations, which is a promising resource for quantum devices, such as quantum memories. The light-matter interaction is treated with a Jaynes-Cummings type model and the quantum field is given by a single mode since the quantum dots are embedded in a microcavity. We present numerical simulations of the four-wave-mixing response of a homogeneous system for pulse sequences and find a significant dependence of the result on the photon statistics of the incident pulses. The model constitutes a problem with a large state space which arises from the frequency distribution of the transition energies of the inhomogeneously broadened quantum dot ensemble that is coupled with a quantum light mode. Here we approximate the dynamics by summing over individual quantum dot-microcavity systems. Photon echoes arising from the excitation with different quantum states of light are simulated and compared.}}, author = {{Rose, Hendrik and Grisard, S. and Trifonov, A. V. and Reichhardt, R. and Reichelt, Matthias and Bayer, M. and Akimov, I. A. and Meier, Torsten}}, booktitle = {{Ultrafast Phenomena and Nanophotonics XXVII}}, publisher = {{SPIE}}, title = {{{Theoretical analysis of four-wave mixing on semiconductor quantum dot ensembles with quantum light}}}, doi = {{10.1117/12.2647700}}, volume = {{12419}}, year = {{2023}}, } @article{45704, abstract = {{Since high-order harmonic generation (HHG) from atoms depends sensitively on the polarization of the driving laser field, the polarization gating (PG) technique was developed and applied successfully to generate isolated attosecond pulses from atomic gases. The situation is, however, different in solid-state systems as it has been demonstrated that due to collisions with neighboring atomic cores of the crystal lattice strong HHG can be generated even by elliptically- and circularly-polarized laser fields. Here we apply PG to solid-state systems and find that the conventional PG technique is inefficient for the generation of isolated ultrashort harmonic pulse bursts. In contrast, we demonstrate that a polarization-skewed laser pulse is able to confine the harmonic emission to a time window of less than one-tenth of the laser cycle. This method provides a novel way to control HHG and to generate isolated attosecond pulses in solids.}}, author = {{Song, Xiaohong and Yang, Shidong and Wang, Guifang and Lin, Jianpeng and Wang, Liang and Meier, Torsten and Yang, Weifeng}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{Atomic and Molecular Physics, and Optics}}, number = {{12}}, publisher = {{Optica Publishing Group}}, title = {{{Control of the electron dynamics in solid-state high harmonic generation on ultrafast time scales by a polarization-skewed laser pulse}}}, doi = {{10.1364/oe.491418}}, volume = {{31}}, year = {{2023}}, } @article{45703, author = {{Zuo, Ruixin and Song, Xiaohong and Ben, Shuai and Meier, Torsten and Yang, Weifeng}}, issn = {{2643-1564}}, journal = {{Physical Review Research}}, keywords = {{General Physics and Astronomy}}, number = {{2}}, publisher = {{American Physical Society (APS)}}, title = {{{Revealing the nonadiabatic tunneling dynamics in solid-state high harmonic generation}}}, doi = {{10.1103/physrevresearch.5.l022040}}, volume = {{5}}, year = {{2023}}, } @article{45709, author = {{Belobo, D. Belobo and Meier, Torsten}}, issn = {{2211-3797}}, journal = {{Results in Physics}}, keywords = {{General Physics and Astronomy}}, publisher = {{Elsevier BV}}, title = {{{Manipulation of nonautonomous nonlinear wave solutions of the generalized coupled Gross–Pitaevskii equations with spin–orbit interaction and weak Raman couplings}}}, doi = {{10.1016/j.rinp.2023.106655}}, year = {{2023}}, } @inproceedings{45759, author = {{Abbas, Nilab and Bauer, Anna Brigitte and Reinhold, Peter}}, booktitle = {{Lernen, Lehren und Forschen in einer digital geprägten Welt}}, editor = {{van Vorst, Helena}}, location = {{Aachen 2023}}, title = {{{PSΦ: Entwicklung von Unterstützungsmaßnahmen für Theoretische Physik}}}, year = {{2023}}, }