@article{8609, author = {{Hövel, S. and Gerhardt, N. C. and Hofmann, M. R. and Lo, F.-Y. and Ludwig, A. and Reuter, Dirk and Wieck, A. D. and Schuster, E. and Wende, H. and Keune, W. and Petracic, O. and Westerholt, K.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Room temperature electrical spin injection in remanence}}}, doi = {{10.1063/1.2957469}}, year = {{2008}}, } @article{8610, author = {{Koop, E. J. and van Wees, B. J. and Reuter, Dirk and Wieck, A. D. and van der Wal, C. H.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, title = {{{Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot}}}, doi = {{10.1103/physrevlett.101.056602}}, year = {{2008}}, } @article{8611, author = {{Hugger, S. and Xu, Hengyi and Tarasov, A. and Cerchez, M. and Heinzel, T. and Zozoulenko, I. V. and Reuter, Dirk and Wieck, A. D.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{Magnetic-barrier-induced conductance fluctuations in quantum wires}}}, doi = {{10.1103/physrevb.78.165307}}, year = {{2008}}, } @article{8612, author = {{Rizo, P. J. and Pugžlys, A. and Liu, J. and Reuter, Dirk and Wieck, A. D. and van der Wal, C. H. and van Loosdrecht, P. H. M.}}, issn = {{0034-6748}}, journal = {{Review of Scientific Instruments}}, title = {{{Compact cryogenic Kerr microscope for time-resolved studies of electron spin transport in microstructures}}}, doi = {{10.1063/1.3046283}}, year = {{2008}}, } @article{8613, author = {{Komijani, Y. and Csontos, M. and Ihn, T. and Ensslin, K. and Reuter, Dirk and Wieck, A. D.}}, issn = {{0295-5075}}, journal = {{EPL (Europhysics Letters)}}, title = {{{Observation of excited states in a p-type GaAs quantum dot}}}, doi = {{10.1209/0295-5075/84/57004}}, year = {{2008}}, } @article{8616, author = {{Kaiser, F J and Kohler, S and Hänggi, P and Malecha, M and Ebbecke, J and Wixforth, A and Schumacher, H W and Kästner, B and Reuter, Dirk and Wieck, A D}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, title = {{{Theoretical and experimental investigations of Coulomb blockade in coupled quantum dot systems}}}, doi = {{10.1088/0953-8984/20/37/374108}}, year = {{2008}}, } @article{8617, author = {{Hernandez, F. G. G. and Greilich, A. and Brito, F. and Wiemann, M. and Yakovlev, D. R. and Reuter, Dirk and Wieck, A. D. and Bayer, M.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{Temperature-induced spin-coherence dissipation in quantum dots}}}, doi = {{10.1103/physrevb.78.041303}}, year = {{2008}}, } @article{8618, author = {{Scheibner, R and König, M and Reuter, Dirk and Wieck, A D and Gould, C and Buhmann, H and Molenkamp, L W}}, issn = {{1367-2630}}, journal = {{New Journal of Physics}}, title = {{{Quantum dot as thermal rectifier}}}, doi = {{10.1088/1367-2630/10/8/083016}}, year = {{2008}}, } @article{4187, abstract = {{We study phonon-assisted electron tunneling in semiconductor quantum dot molecules. In particular, singletsinglet relaxation in a two-electron-doped structure is considered. The influence of Coulomb interaction is discussed via comparison with a single-electron system. We find that the relaxation rate reaches similar values in the two cases but the Coulomb interaction shifts the maximum rates toward larger separations between the dots. The difference in electron-phonon interaction between deformation potential and piezoelectric coupling is investigated. We show that the phonon-induced tunneling between two-electron singlet states is a fast process, taking place on the time scales of the order of a few tens of picoseconds.}}, author = {{Grodecka, A. and Machnikowski, P. and Förstner, Jens}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, keywords = {{tet_topic_qd}}, number = {{8}}, publisher = {{American Physical Society (APS)}}, title = {{{Phonon-assisted tunneling between singlet states in two-electron quantum dot molecules}}}, doi = {{10.1103/physrevb.78.085302}}, volume = {{78}}, year = {{2008}}, } @article{4317, abstract = {{Phonon-assisted singlet-singlet relaxation in semiconductor quantum dot molecules is studied theoretically. Laterally coupled quantum dot structures doped with two electrons are considered. We take into account interaction with acoustic phonon modes via deformation potential and piezoelectric coupling. We show that piezoelectric mechanism for the considered system is of great importance and for some ranges of quantum dot molecule parameters is the dominant contribution to relaxation. It is shown that the phonon-assisted tunneling is much faster (down to ∼ 6 ps even at zero temperature) in comparison with other decoherence processes. The influence of Coulomb interaction is discussed and its consequences are indicated. We calculate the relaxation rates for GaAs quantum dot molecules and study the dependence on quantum dot size, distance and offset between the constituent quantum dots. In addition the temperature dependence of the tunneling rates is analyzed.}}, author = {{Grodecka, Anna and Machnikowski, Paweł and Förstner, Jens}}, issn = {{1610-1634}}, journal = {{physica status solidi (c)}}, keywords = {{tet_topic_qd}}, number = {{2}}, pages = {{474--478}}, publisher = {{Wiley}}, title = {{{Theoretical study of phononassisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules}}}, doi = {{10.1002/pssc.200880319}}, volume = {{6}}, year = {{2008}}, } @inproceedings{7642, author = {{Piegdon, Karoline A. and Matthias, Heinrich and Meier, Cedrik and Kitzerow, Heinz-Siegfried}}, booktitle = {{Emerging Liquid Crystal Technologies III}}, editor = {{Chien, Liang-Chy}}, publisher = {{SPIE}}, title = {{{Tunable optical properties of photonic crystals and semiconductor microdisks using liquid crystals}}}, doi = {{10.1117/12.774194}}, year = {{2008}}, } @book{40012, author = {{Blumberg, Eva}}, title = {{{Multikriteriale Zielerreichung im naturwissenschaftsbezogenen Sachunterricht der Grundschule – Eine Studie zum Einfluss von Strukturierung in schülerorientierten Lehr-Lernumgebungen auf das Erreichen kognitiver, motivationaler und selbstbezogener Zielsetzungen. Inaugural-Dissertation zur Erlangung des akademischen Grades des Doktors in den Erziehungswissenschaften an der Westfälischen Wilhelms-Universität Münster}}}, year = {{2008}}, } @inproceedings{44112, abstract = {{Homogeneous and inhomogeneous broadening of heavy- and light-hole excitons in semiconductor quantum wells are measured along with the excitation dependence of both broadenings. Isolation of disorder-induced broadening is possible with spectra in different coherent pathways.}}, author = {{Meier, Torsten and Zhang, Tianhao and Bristow, Alan D. and Dai, Xingcan and Kuznetsova, Irina and Thomas, P. and Cundiff, S.T.}}, booktitle = {{Quantum Electronics and Laser Science Conference}}, isbn = {{978-1-55752-859-9}}, location = {{San Jose, California United States}}, publisher = {{Optical Society of America}}, title = {{{Direct determination of exciton homogeneous and inhomogeneous linewidths in semiconductor quantum wells with two-dimensional fourier transform spectroscopy}}}, year = {{2008}}, } @inproceedings{44110, author = {{Meier, Torsten and Duc, Huynh Thanh and Koch, S.W. and Pasenow, B.}}, booktitle = {{72nd annual meeting and DPG spring meeting of the Condensed Matter Section and the Divisions}}, location = {{Berlin, Germany}}, title = {{{Intensity dependence of charge and spin currents generated by ultrafast two-color photoexcitation of semiconductor quantum wells}}}, volume = {{43}}, year = {{2008}}, } @inproceedings{44111, author = {{Meier, Torsten and Koch, S.W. and Pasenow, B.}}, booktitle = {{72nd annual meeting and DPG spring meeting of the Condensed Matter Section and the Divisions}}, location = {{Berlin, Germany}}, title = {{{Influence of heavy-hole light-hole band mixing on the strength of optically generated spin-currents in III-V semiconductor quantum wells}}}, volume = {{42}}, year = {{2008}}, } @article{23483, abstract = {{The emitted radiation from semiconductor nanostructures due to the excitation with intense ultrashort optical laser pulses is analyzed. Semiconductor Bloch equations that consistently describe the coupled light-field-induced interband and intraband dynamics are solved numerically. It is demonstrated that the intraband dynamics considerably influences the light emission in the regime of extreme nonlinear optics. In particular, the intraband acceleration significantly modifies the dynamics of the interband polarization which results in a strong enhancement of high-harmonic generation.}}, author = {{Golde, D. and Meier, Torsten and Koch, S. W.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{7}}, title = {{{High harmonics generated in semiconductor nanostructures by the coupled dynamics of optical inter- and intraband excitations}}}, doi = {{10.1103/physrevb.77.075330}}, volume = {{77}}, year = {{2008}}, } @inbook{44109, author = {{Meier, Torsten and Pasenow, B. and Reichelt, Matthias and Stroucken, T.}}, booktitle = {{Nanophotonic Materials: Photonic Crystals, Plasmonics, and Metamaterials}}, editor = {{Busch, Kurt and Kitzerow, H.-S. and Wehrspohn, Ralf B.}}, isbn = {{9783527408580 }}, pages = {{15--38}}, publisher = {{Wiley‐VCH Verlag GmbH & Co. KGaA}}, title = {{{Microscopic Analysis of the Optical and Electronic Properties of Semiconductor Photonic-Crystal Structures}}}, doi = {{10.1002/9783527621880.ch2}}, year = {{2008}}, } @inproceedings{24981, author = {{Güdde, J. and Rohleder, M. and Meier, Torsten and Koch, S.W. and Höfer, U.}}, booktitle = {{Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing}}, isbn = {{978-1-55752-861-2}}, location = {{Rochester, New York United States}}, title = {{{Generation and Time-Resolved Detection of Coherently Controlled Electric Currents at Surfaces}}}, doi = {{10.1364/fio.2008.fmi3}}, year = {{2008}}, } @inbook{23485, abstract = {{The ultrafast dynamics of optical excitations in semiconductors and semiconductor nanostructures can be computed on a microscopic theoretical basis using the semiconductor Bloch equations. This set of equations allows one to nonperturbatively evaluate light-field-induced intraband and interband excitations and is also well suited for the analysis of many-body effects such as excitonic resonances and carrier-carrier and carrier-phonon scattering processes. In this article we start with a description of an experimental observation of coherent spin photocurrents, then we briefly introduce the theoretical approach and review some results of our theory concerning the microscopic description of the ultrafast coherent optical generation and the temporal decay of charge and spin currents in semiconductor nanostructures. The computed transients show an enhanced damping of the spin current relative to the charge current as a consequence of Coulomb scattering between carriers with opposite spin. The influence of quantum kinetic memory effects on the dynamics of the photocurrents is analyzed by evaluating the scattering terms beyond the Markov approximation.}}, author = {{Meier, Torsten and Duc, Huynh Thanh and Vu, Quang Tuyen and Pasenow, Bernhard and Hübner, Jens and Chatteryee, Sangam and Rühle, Wolfgang W. and Haug, Hartmut and Koch, Stephan W.}}, booktitle = {{Advances in Solid State Physics}}, isbn = {{978-3-540-38234-8}}, pages = {{199--210}}, publisher = {{Springer}}, title = {{{Ultrafast Dynamics of Optically-Induced Charge and Spin Currents in Semiconductors}}}, doi = {{10.1007/978-3-540-38235-5_15}}, year = {{2008}}, } @inbook{24979, abstract = {{The ultrafast dynamics of optical excitations in semiconductors and semiconductor nanostructures can be computed on a microscopic theoretical basis using the semiconductor Bloch equations. This set of equations allows one to nonperturbatively evaluate light-field-induced intraband and interband excitations and is also well suited for the analysis of many-body effects such as excitonic resonances and carrier-carrier and carrier-phonon scattering processes. In this article we start with a description of an experimental observation of coherent spin photocurrents, then we briefly introduce the theoretical approach and review some results of our theory concerning the microscopic description of the ultrafast coherent optical generation and the temporal decay of charge and spin currents in semiconductor nanostructures. The computed transients show an enhanced damping of the spin current relative to the charge current as a consequence of Coulomb scattering between carriers with opposite spin. The influence of quantum kinetic memory effects on the dynamics of the photocurrents is analyzed by evaluating the scattering terms beyond the Markov approximation.}}, author = {{Meier, Torsten and Duc, Huynh Thanh and Vu, Quang Tuyen and Pasenow, Bernhard and Hübner, Jens and Chatteryee, Sangam and Rühle, Wolfgang W. and Haug, Hartmut and Koch, Stephan W.}}, booktitle = {{Advances in Solid State Physics}}, isbn = {{978-3-540-38234-8}}, pages = {{199--210}}, publisher = {{Springer}}, title = {{{Ultrafast Dynamics of Optically-Induced Charge and Spin Currents in Semiconductors}}}, doi = {{10.1007/978-3-540-38235-5_15}}, year = {{2008}}, }