TY - JOUR AU - Salewski, M. AU - Poltavtsev, S. V. AU - Yugova, I. A. AU - Karczewski, G. AU - Wiater, M. AU - Wojtowicz, T. AU - Yakovlev, D. R. AU - Akimov, I. A. AU - Meier, Torsten AU - Bayer, M. ID - 13909 IS - 3 JF - Physical Review X SN - 2160-3308 TI - High-Resolution Two-Dimensional Optical Spectroscopy of Electron Spins VL - 7 ER - TY - CONF AU - Höpker, Jan Philipp AU - Bartnick, Moritz AU - Meyer-Scott, Evan AU - Thiele, Frederik AU - Meier, Torsten AU - Bartley, Tim AU - Krapick, Stephan AU - Montaut, Nicola M. AU - Santandrea, Matteo AU - Herrmann, Harald AU - Lengeling, Sebastian AU - Ricken, Raimund AU - Quiring, Viktor AU - Lita, Adriana E. AU - Verma, Varun B. AU - Gerrits, Thomas AU - Nam, Sae Woo AU - Silberhorn, Christine ED - Agio, Mario ED - Srinivasan, Kartik ED - Soci, Cesare ID - 13903 SN - 9781510611733 T2 - Quantum Photonic Devices TI - Towards integrated superconducting detectors on lithium niobate waveguides VL - 10358 ER - TY - CONF AU - Podzimski, Reinold AU - Duc, Huynh Thanh AU - Meier, Torsten ED - Betz, Markus ED - Elezzabi, Abdulhakem Y. ID - 13334 T2 - Ultrafast Phenomena and Nanophotonics XXI TI - A microscopic approach to ultrafast near band gap photocurrents in bulk semiconductors VL - 10102 ER - TY - JOUR AU - Poltavtsev, S. V. AU - Reichelt, Matthias AU - Akimov, I. A. AU - Karczewski, G. AU - Wiater, M. AU - Wojtowicz, T. AU - Yakovlev, D. R. AU - Meier, Torsten AU - Bayer, M. ID - 13908 IS - 7 JF - Physical Review B SN - 2469-9950 TI - Damping of Rabi oscillations in intensity-dependent photon echoes from exciton complexes in a CdTe/(Cd,Mg)Te single quantum well VL - 96 ER - TY - JOUR AU - Driben, R. AU - Konotop, V. V. AU - Meier, Torsten AU - Yulin, A. V. ID - 13288 IS - 1 JF - Scientific Reports SN - 2045-2322 TI - Bloch oscillations sustained by nonlinearity VL - 7 ER - TY - JOUR AU - Liu, Hong ID - 13913 JF - The European Physical Journal B SN - 1434-6028 TI - Influence of strong screening effect on the perpendicular- polarized linear excitonic absorption spectra of semiconducting carbon nanotubes VL - 89 ER - TY - JOUR AU - Sanz, M. AU - Egusquiza, I. L. AU - Di Candia, R. AU - Saberi, H. AU - Lamata, L. AU - Solano, E. ID - 13914 JF - Scientific Reports SN - 2045-2322 TI - Entanglement classification with matrix product states VL - 6 ER - TY - JOUR AU - Opatrný, Tomáš AU - Saberi, Hamed AU - Brion, Etienne AU - Mølmer, Klaus ID - 13921 IS - 2 JF - Physical Review A SN - 2469-9926 TI - Counterdiabatic driving in spin squeezing and Dicke-state preparation VL - 93 ER - TY - JOUR AU - Grynko, Yevgen AU - Zentgraf, Thomas AU - Meier, Torsten AU - Förstner, Jens ID - 1454 IS - 9 JF - Applied Physics B KW - tet_topic_meta KW - tet_topic_shg SN - 0946-2171 TI - Simulations of high harmonic generation from plasmonic nanoparticles in the terahertz region VL - 122 ER - TY - JOUR AU - Sternemann, E. AU - Jostmeier, T. AU - Ruppert, C. AU - Thunich, S. AU - Duc, H. T. AU - Podzimski, R. AU - Meier, Torsten AU - Betz, M. ID - 13919 JF - Applied Physics B SN - 0946-2171 TI - Quantum interference control of electrical currents in GaAs microstructures: physics and spectroscopic applications VL - 122 ER - TY - JOUR AB - For incident light polarized perpendicular to the tube axis the multi-band semiconductor Bloch equations (MB-SBEs) that involve various screened interband Coulomb interactions (ICIs) are derived. The calculated E 12 peak is very close to the longitudinal excitonic peak E 22. Compared with the previous theoretical peak positions, the blue-shift of the peak in our results is about 0.5 eV. Then, subsequent detailed analyses show that the screening effect on the diagonal ICIs (D-ICIs) plays a key role in this big blue-shift. The valley-degenerate transverse pair excitations holding the same selection rule further enhance the screening effect on D-ICIs. Specially at q = 0 the dielectric function acting on the D-ICIs enhances two times. In our calculation the strong screening effect contributes 90% of the big blue-shift, while the non-diagonal ICIs (ND-ICIs) contribute to 10% of the blue-shift. AU - Meier, Torsten AU - Liu, Hong ID - 43194 JF - The European Physical Journal B TI - Influence of strong screening effect on the perpendicular polarized linear excitonic absorption spectra of semiconducting carbon nanotubes VL - 89 ER - TY - JOUR AB - We present the synthesis of indium oxide (In2O3) inverse opal films with photonic stop bands in the visible range by a structure replication method. Artificial opal films made of poly(methyl methacrylate) (PMMA) spheres are utilized as template. The opal films are deposited via sedimentation facilitated by ultrasonication, and then impregnated by indium nitrate solution, which is thermally converted to In2O3 after drying. The quality of the resulting inverse opal film depends on many parameters; in this study the water content of the indium nitrate/PMMA composite after drying is investigated. Comparison of the reflectance spectra recorded by vis-spectroscopy with simulated data shows a good agreement between the peak position and calculated stop band positions for the inverse opals. This synthesis is less complex and highly efficient compared to most other techniques and is suitable for use in many applications. AU - Amrehn, Sabrina AU - Berghoff, Daniel AU - Nikitin, Andreas AU - Reichelt, Matthias AU - Wu, Xia AU - Meier, Torsten AU - Wagner, Thorsten ID - 13917 JF - Photonics and Nanostructures - Fundamentals and Applications SN - 1569-4410 TI - Indium oxide inverse opal films synthesized by structure replication method VL - 19 ER - TY - JOUR AB - The dynamics of a pair of harmonic oscillators represented by three-dimensional fields coupled with a repulsive cubic nonlinearity is investigated through direct simulations of the respective field equations and with the help of the finite-mode Galerkin approximation (GA), which represents the two interacting fields by a superposition of 3+3 harmonic-oscillator p-wave eigenfunctions with orbital and magnetic quantum numbers l=1 and m=1, 0, −1. The system can be implemented in binary Bose-Einstein condensates, demonstrating the potential of the atomic condensates to emulate various complex modes predicted by classical field theories. First, the GA very accurately predicts a broadly degenerate set of the system's ground states in the p-wave manifold, in the form of complexes built of a dipole coaxial with another dipole or vortex, as well as complexes built of mutually orthogonal dipoles. Next, pairs of noncoaxial vortices and/or dipoles, including pairs of mutually perpendicular vortices, develop remarkably stable dynamical regimes, which feature periodic exchange of the angular momentum and periodic switching between dipoles and vortices. For a moderately strong nonlinearity, simulations of the coupled-field equations agree very well with results produced by the GA, demonstrating that the dynamics is accurately spanned by the set of six modes limited to l=1. AU - Driben, R. AU - Konotop, V. V. AU - Malomed, B. A. AU - Meier, Torsten ID - 13915 IS - 1 JF - Physical Review E SN - 2470-0045 TI - Dynamics of dipoles and vortices in nonlinearly coupled three-dimensional field oscillators VL - 94 ER - TY - CONF AU - Podzimski, Reinold AU - Duc, Huynh Thanh AU - Priyadarshi, Shekhar AU - Schmidt, Christian AU - Bieler, Mark AU - Meier, Torsten ED - Betz, Markus ED - Elezzabi, Abdulhakem Y. ID - 13918 T2 - Ultrafast Phenomena and Nanophotonics XX TI - Photocurrents in semiconductors and semiconductor quantum wells analyzed by k.p-based Bloch equations VL - 9746 ER - TY - JOUR AB - Spins in semiconductor quantum dots have been considered as prospective quantum bit excitations. Their coupling to the crystal environment manifests itself in a limitation of the spin coherence times to the microsecond range, both for electron and hole spins. This rather short-lived coherence compared to atomic states asks for manipulations on timescales as short as possible. Due to the huge dipole moment for transitions between the valence and conduction band, pulsed laser systems offer the possibility to perform manipulations within picoseconds or even faster. Here, we report on results that show the potential of optical spin manipulations with currently available pulsed laser systems. Using picosecond laser pulses, we demonstrate optically induced spin rotations of electron and hole spins. We further realize the optical decoupling of the hole spins from the nuclear surrounding at the nanosecond timescales and demonstrate an all-optical spin tomography for interacting electron spin sub-ensembles. AU - Varwig, S. AU - Evers, E. AU - Greilich, A. AU - Yakovlev, D. R. AU - Reuter, Dirk AU - Wieck, A. D. AU - Meier, Torsten AU - Zrenner, Artur AU - Bayer, M. ID - 4246 IS - 1 JF - Applied Physics B KW - Spin Polarization KW - Pump Pulse KW - Trion KW - Spin Component KW - Coherence Time SN - 0946-2171 TI - Advanced optical manipulation of carrier spins in (In,Ga)As quantum dots VL - 122 ER - TY - JOUR AU - Ma, Xuekai AU - Driben, Rodislav AU - Malomed, Boris A. AU - Meier, Torsten AU - Schumacher, Stefan ID - 13910 JF - Scientific Reports SN - 2045-2322 TI - Two-dimensional symbiotic solitons and vortices in binary condensates with attractive cross-species interaction VL - 6 ER - TY - JOUR AB - A method is presented to transfer a system of two-level atoms from a spin coherent state to a maximally spin squeezed Dicke state, relevant for quantum metrology and quantum information processing. The initial state is the ground state of an initial linear Hamiltonian that is gradually turned into a final quadratic Hamiltonian whose ground state is the selected Dicke state. We use compensating operators to suppress diabatic transitions to unwanted states that would occur if the change were not slow. We discuss the possibilities of constructing the compensating operators by sequential application of quadratic Hamiltonians available in experiments. AU - Meier, Torsten AU - Opatrný, T. AU - Saberi, H. AU - Brion, E. AU - Mølmer, K. ID - 43196 IS - 2 JF - Physical Review A TI - Counterdiabatic driving in spin squeezing and Dicke-state preparation VL - 93 ER - TY - JOUR AB - We propose an entanglement classification for symmetric quantum states based on their diagonal matrix-product-state (MPS) representation. The proposed classification, which preserves the stochastic local operation assisted with classical communication (SLOCC) criterion, relates entanglement families to the interaction length of Hamiltonians. In this manner, we establish a connection between entanglement classification and condensed matter models from a quantum information perspective. Moreover, we introduce a scalable nesting property for the proposed entanglement classification, in which the families for N parties carry over to the N + 1 case. Finally, using techniques from algebraic geometry, we prove that the minimal nontrivial interaction length n for any symmetric state is bounded by . AU - Sanz, M. AU - Egusquiza, I.L. AU - Candia, R. Di AU - Saberi, H. AU - Lamata, L. AU - Solano, E. ID - 43195 JF - Scientific Reports TI - Entanglement classification with matrix product states VL - 6 ER - TY - JOUR AB - A microscopic approach that is based on the multisubband semiconductor Bloch equations formulated in the basis of a 14-band k⋅p model is employed to compute the temporal dynamics of photocurrents in GaAs quantum wells following excitation with femtosecond laser pulses. This approach provides a transparent description of the interband, intersubband, and intraband excitations, fully includes all resonant as well as off-resonant excitations, and treats the light-matter interaction nonperturbatively. For linearly polarized excitations, the photocurrents contain contributions from shift and rectification currents. We numerically compute and analyze these currents generated by excitation with femtosecond laser pulses for [110]- and [111]-oriented GaAs quantum wells. It is shown that the often employed perturbative χ(2) approach breaks down for peak fields larger than about 10 kV/cm, and that nonperturbative effects lead to a reduction of the peak values of the shift and rectification currents and to temporal oscillations that originate from Rabi flopping. In particular, we find a complex oscillatory photon energy dependence of the magnitudes of the shift and rectification currents. Our simulations demonstrate that this dependence is the result of mixing between the heavy- and light-hole valence bands. This is a surprising finding since the band mixing has an even larger influence on the strength of the photocurrents than the absorption coefficient. For [110]-oriented GaAs quantum wells, the calculated photon energy dependence is compared to experimental results, and good agreement is obtained. This validates our theoretical approach. AU - Duc, Huynh Thanh AU - Podzimski, Reinold AU - Priyadarshi, Shekhar AU - Bieler, Mark AU - Meier, Torsten ID - 22942 IS - 8 JF - Physical Review B SN - 2469-9950 TI - Ultrafast shift and rectification photocurrents in GaAs quantum wells: Excitation intensity dependence and the importance of band mixing VL - 94 ER - TY - JOUR AB - Nonlinearity is the driving force for numerous important effects in nature typically showing transitions between different regimes, regular, chaotic or catastrophic behavior. Localized nonlinear modes have been the focus of intense research in areas such as fluid and gas dynamics, photonics, atomic and solid state physics etc. Due to the richness of the behavior of nonlinear systems and due to the severe numerical demands of accurate three-dimensional (3D) numerical simulations presently only little knowledge is available on the dynamics of complex nonlinear modes in 3D. Here, we investigate the dynamics of 3D non-coaxial matter wave vortices that are trapped in a parabolic potential and interact via a repulsive nonlinearity. Our numerical simulations demonstrate the existence of an unexpected and fascinating nonlinear regime that starts immediately when the nonlinearity is switched-on and is characterized by a smooth dynamics representing torque-free precession with nutations. The reported motion is proven to be robust regarding various effects such as the number of particles, dissipation and trap deformations and thus should be observable in suitably designed experiments. Since our theoretical approach, i.e., coupled nonlinear Schrödinger equations, is quite generic, we expect that the obtained novel dynamical behavior should also exist in other nonlinear systems. AU - Driben, R. AU - Konotop, V. V. AU - Meier, Torsten ID - 13916 JF - Scientific Reports SN - 2045-2322 TI - Precession and nutation dynamics of nonlinearly coupled non-coaxial three-dimensional matter wave vortices VL - 6 ER -