@inproceedings{44060, abstract = {{In recent years, single-walled carbon nanotubes (SWCNTs) have received widespread attention due to their perfect quasi-one-dimensional structure and unique physical properties, as well as their potential for applications. In the present work, we calculate the band structure of SWCNTs using an atomistic tight-binding model including spin-orbit interaction. We combine this approach with a many-particle calculation of the nonlinear optical response using multi-band semiconductor Bloch equations. We show that, for SWCNTs lacking inversion symmetry, the intrinsic spin-orbit interaction can give rise to single-color photoinduced charge and spin currents. In particular, we study the influence of excitonic effects on these photoinduced currents and draw the analogy to recent investigations on single-color injection of photocurrents in semiconductor quantum wells.}}, author = {{Meier, Torsten and Liu, Hong and Duc, Huynh Thanh and Schumache, Stefan}}, booktitle = {{75. Annual meeting of the DPG and combined DPG Spring meeting}}, issn = {{0420-0195}}, location = {{Dresden, Germany}}, number = {{1}}, title = {{{Photocurrents in semiconductor carbon nanotubes with spin-orbit interaction}}}, volume = {{46}}, year = {{2011}}, } @inproceedings{44062, abstract = {{Optical two-dimensional Fourier transform spectroscopy has been used to study the properties of semiconductor nanostructures in four-wave-mixing like experiments. Applying a phenomenological level model, we numerically and analytically analyze the main features of excitonic and biexcitonic contributions in a semiconductor quantum well by solving the optical Bloch equations. The method is extended to three-dimensional Fourier transform spectroscopy to investigate a recent experiment.}}, author = {{Meier, Torsten and Wiebeler, Christian and Reichelt, Matthias}}, booktitle = {{ 75. Annual meeting of the DPG and combined DPG Spring meeting }}, issn = {{0420-0195}}, location = {{Dresden, Germany}}, number = {{1}}, title = {{{Analysis of multidimensional Fourier transform spectroscopy for semiconductors with a phenomenological level model}}}, volume = {{46}}, year = {{2011}}, } @inproceedings{44061, abstract = {{If a two-level system is excited with an intense light field of several times the Rabi frequency, the well-known Mollow triplets appear in the emitted radiation spectrum. We show that the pattern of the emission spectrum can be changed by using appropriately shaped laser pulses. The effect is also observable for a more realistic description of a semiconductor system.}}, author = {{Meier, Torsten and Reichelt, Matthias and Walther, Andrea}}, booktitle = {{75. Annual meeting of the DPG and combined DPG Spring meeting}}, issn = {{0420-0195}}, location = {{ Dresden, Germany}}, number = {{1}}, title = {{{Extreme nonlinear optics in semiconductors with shaped laser pulses}}}, volume = {{46}}, year = {{2011}}, } @inproceedings{44064, abstract = {{We compute photocurrents generated by femtosecond single-color laser pulses in non-centrosymmetric semiconductor quantum wells by combining a 14 x 14 k.p band structure theory with multi-band semiconductor Bloch equations. The transient photocurrents are investigated experimentally by measuring the associated Terahertz emission. The dependencies of the photocurrent and the Terahertz emission on the excitation conditions are discussed for (110)-oriented GaAs quantum wells. The comparison between theory and experiment shows a good agreement.}}, author = {{Meier, Torsten and Duc, Huynh Thanh and Foerstner, Jens and Priyadarshi, S. and Racu, Ana Maria and Pierz, Klaus and Siegner, Uwe and Bieler, Mark}}, booktitle = {{DPG Spring meeting 2010 }}, issn = {{0420-0195}}, location = {{Regensburg, Germany}}, number = {{3}}, title = {{{Experimental and theoretical investigations of photocurrents in non-centrosymmetric semiconductor quantum wells}}}, volume = {{45}}, year = {{2010}}, } @inproceedings{44065, abstract = {{The behavior of waveguide plasmon polaritons is studied employing ultrafast coherent control like schemes for a gold lattice coupled to a photonic waveguide for the structure. Different models to describe the third-harmonic generation are presented and the resulting equations are solved numerically. The calculations are compared to recent experimental data and show good agreement for the most prominent features in the time-integrated third order intensity.}}, author = {{Meier, Torsten and Podzimski, Reinold and Reichelt, Matthias and Utikal, Tobias and Giessen, Harald}}, booktitle = {{DPG Spring meeting 2010}}, issn = {{0420-0195}}, location = {{Regensburg, Germany}}, number = {{3}}, title = {{{Controlling the third-harmonic generation in a metallic photonic crystal coupled to a waveguide}}}, volume = {{45}}, year = {{2010}}, } @inproceedings{44066, abstract = {{We present a joint theoretical study of the optical properties of GaAs and AlAs bulk and heterostructures. Thereby, we compare the theoretical description of optical excitation on several levels of theory. Results obtained from kp theory are discussed along with data from ab initio calculations within the frameworks of independent-particle (DFT), independent quasiparticle (GW), or Coulomb-correlated quasiparticle (BSE) approximation.}}, author = {{Meier, Torsten and Landmann, Marc and Pochwala, Michal and Foerstner, Jens and Rauls, Eva and Schmidt, Wolf Gero}}, booktitle = {{DPG Spring meeting 2010}}, issn = {{0420-0195}}, location = {{Regensburg, Germany}}, number = {{3}}, title = {{{Theoretical description of optical properties in III-V semiconductor nanostructures}}}, volume = {{45}}, year = {{2010}}, } @inproceedings{44069, abstract = {{Recently it has been shown experimentally that it is possible to coherently control nano-optical excitations by using sophisticated shaped laser pulses. In this work a similar technique is used to theoretically investigate a hybrid nanostructure which consists of a metal aperture and a quantum wire. It is shown that one can concentrate the optically excited electron density at an arbitrary position due to wave packet dynamics by chosing particular frequency components and phases of the chirped laser pulse. The optimization process is performed with a genetic algorithm which is linked to a 3D-FDTD solver.}}, author = {{Meier, Torsten and Reichelt, Matthias}}, booktitle = {{DPG Spring meeting 2009}}, issn = {{0420-0195}}, location = {{Dresden, Germany}}, number = {{5}}, title = {{{Coherent control in hybrid metal-semiconductor nanostructures}}}, volume = {{44}}, year = {{2009}}, } @inproceedings{44068, abstract = {{The band structure and wave functions of GaAs quantum wells are computed via k.p band structure theory including anisotropy and spin splitting. Using these results, the process of generating photocurrents by optical excitation is analyzed. Depending on the symmetry of the material, the direction of the laser beam, and the polarization direction of the light field/s, one can coherently generate charge and/or spin photocurrents on ultrashort time scales. The direction, the strength, and the dynamics of these photocurrents are computed and discussed.}}, author = {{Meier, Torsten and Duc, Huynh Thanh and Foerstner, Jens}}, booktitle = {{DPG Spring meeting 2009}}, issn = {{0420-0195}}, location = {{Dresden, Germany}}, number = {{5}}, title = {{{Photo-and spin current generation and dynamics in semiconductor nanostructures}}}, volume = {{44}}, year = {{2009}}, } @inproceedings{44293, author = {{Meier, Torsten and Vu, Q.T. and Koch, S.W. and Duc, Huynh Thanh}}, booktitle = {{Meeting of the German Physical Society, Solid-State Physics Section, and the European Physical Society Condensed Matter Division}}, issn = {{0420-0195}}, location = {{Dresden, Germany}}, title = {{{Coherent optical generation and decay of charge and spin currents in semiconductor heterostructures analyzed by microscopic theory}}}, volume = {{41}}, year = {{2006}}, }