TY - CONF AU - Hilleringmann, Ulrich AU - Adams, S AU - Goser, K ID - 39917 T2 - Proceedings ISSSE’92 TI - A Silicon Technology for Monolithic Integration of Optical Waveguides, Photodetectors and VLSI CMOS Circuits ER - TY - CONF AU - Adams, S AU - Hilleringmann, Ulrich AU - Goser, K ID - 39918 T2 - EFOC LAN TI - Electrooptical coupling of waveguides and VLSI circuits integrated on one silicon chip ER - TY - JOUR AU - Schroeter-Wittke, Harald ID - 43483 JF - Der Evangelische Erzieher TI - Michel plays Petrucciani. Oder: "So wenig sind wir auf uns selbst gestellt." Oder: Praktisch-theologische Wahr-Nehmungen in dem "Spielraum von Schnitten" VL - 44 ER - TY - CONF AB - Summary form only given. The numerical investigations are based on a microscopic many-body theory which allows one to compute the linear and nonlinear optical properties of semiconductor superlattices in the presence of homogeneous electric fields applied in the growth direction. The THz-emission due to the field-driven dynamics of photoexcited carriers is investigated for the combined action of static and alternating fields. For a driving field it was shown within a simple model that the equations governing the intraband dynamics in the field-driven superlattice should be analogous to the ones describing the superconducting Josephson junction. The transport properties in this regime can be described by the picture of multi-photon-assisted tunneling between Wannier-Stark states. AU - Meier, Torsten AU - Thomas, P. AU - Koch, S.W. ID - 44291 SN - 1-55752-576-X T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - THz-emission from photoexcited semiconductor superlattices with applied ac and dc electric fields ER - TY - CONF AB - Summary form only given. Partly non-degenerate four-wave mixing is able to detect coherent coupling between excitonic resonances like e.g. light-hole and heavy-hole excitons or between an exciton and its continuum states. We apply an extension of this method, which we call selective coherent spectroscopy (SCS), to symmetrically strained (GaIn)As/Ga(PAs) multiple quantum-wells. The samples are excited simultaneously by a picosecond pulse with wavevector k/sub 1/ and a 100 fs pulse with wavevector k/sub 2/. The central wavelength of the picosecond pulse is scanned over the entire spectrum of the 100 fs pulse and the four-wave mixing signal in the direction 2k/sub 2/-k/sub 1/ is detected at a fixed energy. This scan provides an SCS spectrum. AU - Meier, Torsten AU - Euteneuer, A. AU - Finger, E. AU - Hofmann, M. AU - Stolz, W. AU - Thomas, P. AU - Koch, S.W. AU - Ruhle, W.W. ID - 44292 T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - Distribution of exciton binding-energies in disordered semiconductor quantum-wells ER - TY - CONF AB - Summary form only given. For a proper understanding of nonlinear optical experiments in semiconductors even the low-density limit Coulomb-induced many body correlations beyond the Hartree-Fock decoupling scheme need to be considered. In the coherent X(3) limit these correlations manifest themselves in the contributions of bound and unbound two-exciton states to the optical response. The understanding of nonlinear excitonic effects in the Stark effect of semiconductors including carrier-correlations is still of fundamental interest. AU - Meier, Torsten AU - Sieh, C. AU - Koch, S.W. AU - Brick, P. AU - Hubner, M. AU - Ell, C. AU - Prineas, J. AU - Khitrova, G. AU - Gibbs, H.M. ID - 44290 SN - 1-55752-576-X T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - Influence of carrier-correlations on the optical Stark effect of semiconductors ER - TY - CONF AB - Recent experiments by Roskos et al. in ultrashort optical pulse excitation of biased coupled quantum wells have shown remarkable generation of terahertz electromagnetic radiation. Two different effects were identified: (i) an oscillatory field of frequency corresponding to the separation between the coupled levels in the quantum-well pair (~ 1.5 THz); and (ii) an “instantaneous” electromagnetic field pulse that appears to follow the time evolution of the exciting laser pulse. The oscillatory field is understood to be caused by the coherent oscillation of optically created electrons from one well to the other.[1] The “instantaneous” part we believe is caused by a new mechanism proposed in Ref. 2. The essence of this “instantaneous” mechanism is that electron-hole pairs are created in a biased semiconductor with a net polarization. The density of these pairs follows the light field, as does the induced polarization, hence, generating an electromagnetic source that follows the light pulse. Such mechanisms have been discussed before for photon energies below the optical bandgap energy,[3] although they have so far been difficult to observe. In our work, we have generalized and extended such effects to photon energies above the handgap energy. In this paper we will discuss both of these mechanisms as well as the fourwave-mixing (FWM) signal,[4] and show how they can be understood within one unified formalism. We will also show that the calculations agree well with the experimental results. AU - Meier, Torsten AU - Schulze, A. AU - Scmittrink, S. AU - Thomas, P. AU - Chuang, S.L. ID - 44289 T2 - International Quantum Electronics Conference TI - Terahertz Electromagnetic Pulse Generation and Four-Wave Mixing in Coupled Quantum Wells ER - TY - CONF AB - In the presence of a homogeneous electric field, 𝐹→, each Bloch state in a crystal changes quasimomentum according to the so-called acceleration theorem Thus, in the absence of interband tunneling and scattering processes, each Bloch state moves at a constant velocity in k-space and executes a periodic motion in the reduced zone scheme by undergoing a Bragg reflection between each two traversals of the Brillouin zone. AU - Meier, Torsten AU - von Plessen, G. AU - Schulze, A. AU - Thomas, P. ID - 44288 T2 - International Quantum Electronics Conference TI - On the Observability of Bloch Oscillations in Time-Resolved Four-Wave-Mixing ER - TY - GEN AU - Herzig, Bardo ID - 45259 TI - Entwurf einer Benutzeroberfläche für die Analyse von kontextfreien und DCG - Grammatiken und ihre didaktische Verwendung. Erste Staatsarbeit im Fach Informatik ER - TY - CONF AU - Jonas-Ahrend, Gabriela ID - 47608 TI - Physics Education in East and West Germany ER - TY - CHAP AU - Eke, Norbert Otto ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19432 T2 - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn TI - „Wie wird künftig Meusel die hungrige Nachwelt hetzen und peinigen“. Deutsche Romane 1815-1830 in der Fürstlichen Bibliothek Corvey. Vorläufiges zum Forschungsprojekt „Der deutsche Roman 1815-1830" ER - TY - CHAP AB - Angaben zur Herausgeberschaft: Hg. von Rainer Schöwerling und Hartmut Steinecke unter Mitarbeit von Norbert Otto Eke und Günter Tiggesbäumker AU - Eke, Norbert Otto ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19488 T2 - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn TI - Diskussionsberichte zu den Sektionen 2 („Roman“) und 3 („Dramen“) sowie der Abschlußdiskussion des 1. Internationalen Corvey-Symposions ER - TY - BOOK AB - Präzisierung der Herausgeberschaft: Hg. von Rainer Schöwerling und Hartmut Steinecke unter Mitarbeit von Norbert Otto Eke und Günter Tiggesbäumker ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19091 TI - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn ER - TY - GEN AU - Hilgert, Joachim ID - 51585 T2 - JBer. DMV TI - Fomenko, A.T. Symplectic Geometry (Gordon and Breach, 1988) VL - 94 ER - TY - JOUR AU - Hilgert, Joachim AU - Ólafsson, G. ID - 51442 JF - Japan. J. Math. TI - Analytic Extensions of Representations, the Solvable Case VL - 18 ER - TY - JOUR AU - Hilgert, Joachim ID - 51443 JF - Math. Zeitschrift TI - Controllability on Real Reductive Groups VL - 209 ER - TY - JOUR AU - Flögel, A. AU - Kleine Büning, H. AU - Lettmann, Theodor ID - 19814 JF - RAIRO - Theoretical Informatics and Applications SN - 0988-3754 TI - On the restricted equivalence for subclasses of propositional logic ER - TY - GEN AU - Simon, Jens ID - 2453 TI - Benutzung virtueller Topologien unter PARIX ER - TY - GEN AU - Röttger, Markus AU - Simon, Jens AU - Schroeder, Ulf-Peter ID - 2454 TI - Virtual Topology Library for PARIX ER - TY - GEN AU - Diekmann, Ralf AU - Lüling, Reinhard AU - Simon, Jens ID - 2455 TI - Problem Independent Distributed Simulated Annealing and its Applications ER -