TY - JOUR AB - We investigate the interplay between geometrical lattice resonances and surface plasmons mediating the emission of Smith-Purcell visible light via angle-resolved cathodoluminescence spectroscopy. We observe strong modulations in the dispersion curves of Smith-Purcell radiation (SPR) when they intersect the surface plasmons of silver gratings using a 200-kV transmission electron microscope. The decay of the plasmons away from the grating is directly probed by controlling the electron-beam position relative to the sample surface with nanometer precision. Our measurements are in excellent agreement with numerical simulations, clearly revealing the presence of characteristic Fano profiles resulting from the interference of the light continuum and the discrete plasmon states for each direction of emission. The intensity anomaly in the SPR emission pattern can be well explained from the geometrical consideration of the intersections between the dispersion planes of the SPR and surface plasmon polariton (SPP). A strong and directional SPR beam can be realized under the condition that the SPR dispersion plane comes in contact with the band edge of the SPP dispersion plane. AU - Yamamoto, Naoki AU - Javier García de Abajo, F. AU - Myroshnychenko, Viktor ID - 4409 IS - 12 JF - Physical Review B SN - 1098-0121 TI - Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy VL - 91 ER - TY - JOUR AU - Debus, J. AU - Kudlacik, D. AU - Sapega, V. F. AU - Dunker, D. AU - Bohn, P. AU - Paßmann, F. AU - Braukmann, D. AU - Rautert, J. AU - Yakovlev, D. R. AU - Reuter, Dirk AU - Wieck, A. D. AU - Bayer, M. ID - 7218 IS - 19 JF - Physical Review B SN - 1098-0121 TI - Nuclear spin polarization in the electron spin-flip Raman scattering of singly charged (In,Ga)As/GaAs quantum dots VL - 92 ER - TY - JOUR AU - Finke, A. AU - Ruth, M. AU - Scholz, S. AU - Ludwig, A. AU - Wieck, A. D. AU - Reuter, Dirk AU - Pawlis, A. ID - 7222 IS - 3 JF - Physical Review B SN - 1098-0121 TI - Extending the spectral range of CdSe/ZnSe quantum wells by strain engineering VL - 91 ER - TY - JOUR AB - An electric field applied to a semiconductor reduces its crystal symmetry and modifies its electronic structure which is expected to result in changes of the linear and nonlinear response to optical excitation. In GaAs, we observe experimentally strong electric field effects on the optical second (SHG) and third (THG) harmonic generation. The SHG signal for the laser-light k vector parallel to the [001] crystal axis is symmetry forbidden in the electric-dipole approximation, but can be induced by an applied electric field in the vicinity of the 1s exciton energy. Surprisingly, the THG signal, which is allowed in this geometry, is considerably reduced by the electric field. We develop a theory which provides good agreement with the experimental data. In particular, it shows that the optical nonlinearities for the 1s exciton resonance are modified in an electric field by the Stark effect, which mixes the 1s and 2p exciton states of opposite parity. This mixing acts in opposite way on the SHG and THG processes, as it leads to the appearance of forbidden SHG in (001)-oriented GaAs and decreases the crystallographic THG. AU - Brunne, D. AU - Lafrentz, M. AU - Pavlov, V. V. AU - Pisarev, R. V. AU - Rodina, A. V. AU - Yakovlev, D. R. AU - Bayer, M. ID - 6522 IS - 8 JF - Physical Review B SN - 1098-0121 TI - Electric field effect on optical harmonic generation at the exciton resonances in GaAs VL - 92 ER - TY - JOUR AU - Schmutzler, Johannes AU - Lewandowski, Przemyslaw AU - Aßmann, Marc AU - Niemietz, Dominik AU - Schumacher, Stefan AU - Kamp, Martin AU - Schneider, Christian AU - Höfling, Sven AU - Bayer, Manfred ID - 15859 JF - Physical Review B SN - 1098-0121 TI - All-optical flow control of a polariton condensate using nonresonant excitation ER - TY - JOUR AU - Landmann, M. AU - Rauls, E. AU - Schmidt, Wolf Gero AU - Neumann, M. D. AU - Speiser, E. AU - Esser, N. ID - 10027 JF - Physical Review B SN - 1098-0121 TI - GaNm-plane: Atomic structure, surface bands, and optical response ER - TY - JOUR AU - Li, Yanlu AU - Schmidt, Wolf Gero AU - Sanna, Simone ID - 10031 JF - Physical Review B SN - 1098-0121 TI - Defect complexes in congruentLiNbO3and their optical signatures ER - TY - JOUR AU - Müllegger, Stefan AU - Rauls, Eva AU - Gerstmann, Uwe AU - Tebi, Stefano AU - Serrano, Giulia AU - Wiespointner-Baumgarthuber, Stefan AU - Schmidt, Wolf Gero AU - Koch, Reinhold ID - 13493 IS - 22 JF - Physical Review B SN - 1098-0121 TI - Mechanism for nuclear and electron spin excitation by radio frequency current VL - 92 ER - TY - JOUR AU - Edler, F. AU - Miccoli, I. AU - Demuth, S. AU - Pfnür, H. AU - Wippermann, S. AU - Lücke, A. AU - Schmidt, Wolf Gero AU - Tegenkamp, C. ID - 13496 IS - 8 JF - Physical Review B SN - 1098-0121 TI - Interwire coupling forIn(4×1)/Si(111) probed by surface transport VL - 92 ER - TY - JOUR AU - Klein, C. AU - Vollmers, N. J. AU - Gerstmann, Uwe AU - Zahl, P. AU - Lükermann, D. AU - Jnawali, G. AU - Pfnür, H. AU - Tegenkamp, C. AU - Sutter, P. AU - Schmidt, Wolf Gero AU - Horn-von Hoegen, M. ID - 13502 IS - 19 JF - Physical Review B SN - 1098-0121 TI - Barrier-free subsurface incorporation of 3d metal atoms into Bi(111) films VL - 91 ER -