@inproceedings{4247, abstract = {{We numerically investigate strong light-matter interaction and normal mode coupling/splitting in a system composed of a single two-level atom and the localized mode of a small mode volume photonic crystal nanocavity.}}, author = {{Förstner, Jens and Dineen, Colm and Zakharian, A.R. and Moloney, Jerome V. and Koch, Stephan W.}}, booktitle = {{Frontiers in Optics}}, isbn = {{1557527970}}, publisher = {{OSA}}, title = {{{Normal Mode Coupling in Photonic Crystal Nanocavities}}}, doi = {{10.1364/fio.2005.fwc2}}, year = {{2005}}, } @article{4249, abstract = {{The interaction of electrons with LO phonons provides an important mechanism of optical dephasing and carrier scattering for the two-dimensional electron gas in semiconductor quantum wells. In this paper, the corresponding ultrafast nonlinearities for off-resonant and resonant intersubband excitations are investigated. Quantum kinetic effects of the electron-phonon interaction and the corresponding violation of the microscopic energy conservation yield a qualitative different picture compared to the standard Markovian theory, if the phonon energy is larger than the intersubband-gap energy.}}, author = {{Butscher, Stefan and Förstner, Jens and Waldmüller, Inès and Knorr, Andreas}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, keywords = {{tet_topic_qw}}, number = {{4}}, pages = {{045314--045314--4}}, publisher = {{American Physical Society (APS)}}, title = {{{Ultrafast electron-phonon interaction of intersubband transitions: Quantum kinetics from adiabatic following to Rabi-oscillations}}}, doi = {{10.1103/physrevb.72.045314}}, volume = {{72}}, year = {{2005}}, } @inproceedings{4251, abstract = {{A system of two quantum dots coupled by dipole‐dipole interaction is investigated within a density matrix approach. We compute the temporal evolution of the system in the linear and nonlinear optical regime and discuss the possibility of performing basic quantum information gates. The influence of the Förster energy transfer on Rabi oscillations is discussed.}}, author = {{Danckwerts, J. and Förstner, Jens and Knorr, A.}}, booktitle = {{AIP Conference Proceedings}}, issn = {{0094-243X}}, keywords = {{tet_topic_qd}}, publisher = {{AIP}}, title = {{{Quantum information processing using Coulomb-coupled quantum dots}}}, doi = {{10.1063/1.1994668}}, volume = {{772}}, year = {{2005}}, } @article{4252, abstract = {{The electromagnetic field of a high-quality photonic crystal nanocavity is computed using the finite difference time domain method. It is shown that a separatrix occurs in the local energy flux discriminating between predominantly near and far field components. Placing a two-level atom into the cavity leads to characteristic field modifications and normalmode splitting in the transmission spectra.}}, author = {{Dineen, C. and Förstner, Jens and Zakharian, A.R. and Moloney, J.V. and Koch, S.W.}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_phc}}, number = {{13}}, publisher = {{The Optical Society}}, title = {{{Electromagnetic field structure and normal mode coupling in photonic crystal nanocavities}}}, doi = {{10.1364/opex.13.004980}}, volume = {{13}}, year = {{2005}}, } @article{4254, abstract = {{A microscopic description based on the density matrix formalism is developed to describe the dynamics of photoemission of hot electrons at semiconductor surfaces, including the interaction of bulk and surface states. The equations of motion for the electronic occupations and transitions include the interaction with arbitrary optical fields as well as the electron-phonon coupling. Model wave functions are used to qualitatively describe the bulk-surface dynamics and the subsequent time resolved two-photon photoemission s2PPEd spectra. Our results suggest that it is possible to extract energetic and temporal information of the underlying dynamical occupations of the intermediate states from the 2PPE spectra.}}, author = {{Zeiser, A. and Bücking, N. and Förstner, Jens and Knorr, A.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{24}}, publisher = {{American Physical Society (APS)}}, title = {{{Microscopic theory of electron dynamics and time-resolved two-color two-photon photoemission at semiconductor surfaces}}}, doi = {{10.1103/physrevb.71.245309}}, volume = {{71}}, year = {{2005}}, } @inproceedings{4258, abstract = {{A theoretical description of ultrafast phonon induced electronic transport between surface and bulk states after optical excitation is presented. In particular, the influence of the electron transfer processes on two photon photo emission is evaluated. }}, author = {{Bucking, N. and Zeiser, A. and Förstner, Jens and Knorr, A.}}, booktitle = {{2005 Quantum Electronics and Laser Science Conference}}, isbn = {{1557527962}}, pages = {{1929--1931}}, publisher = {{IEEE}}, title = {{{Kinetic theory of the electron transport in the two photon photo emission at semiconductor surfaces}}}, doi = {{10.1109/qels.2005.1549331}}, year = {{2005}}, } @inproceedings{4259, abstract = {{The ultrafast intersubband dynamics in a semiconductor quantum well subband system is investigated theoretically. Non-Markovian electron-phonon interaction leads to polaron formation and enhanced dephasing. }}, author = {{Butscher, S. and Förstner, Jens and Waldmuller, I. and Knorr, A.}}, booktitle = {{2005 Quantum Electronics and Laser Science Conference}}, isbn = {{1557527962}}, pages = {{640--642}}, publisher = {{IEEE}}, title = {{{Ultrafast quantum kinetics of semiconductor intersubband transitions: polaron signatures and dephasing dynamics}}}, doi = {{10.1109/qels.2005.1548881}}, year = {{2005}}, } @article{4260, abstract = {{Using a fully quantized description of strongly confined electrons interacting with acoustic phonons and the photon field, the nonstationary resonance-fluorescence spectra of a semiconductor quantum dot are investigated. For excitation pulses with durations approaching typical electron-phonon scattering times, the virtual quantum processes yield an observable electron-phonon sideband broadening.}}, author = {{Ahn, K. J. and Förstner, Jens and Knorr, A.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, keywords = {{tet_topic_qd}}, number = {{15}}, publisher = {{American Physical Society (APS)}}, title = {{{Resonance fluorescence of semiconductor quantum dots: Signatures of the electron-phonon interaction}}}, doi = {{10.1103/physrevb.71.153309}}, volume = {{71}}, year = {{2005}}, } @article{4262, abstract = {{Time-dependent two-photon photoemission spectra are used to resolve the femtosecond dynamics of hot electrons at the energetically lowest surface resonance of reconstructed InP(100). Two different cases are studied, where electrons either are lifted into the surface resonance via a direct optical transition or are captured from bulk states. These data are the first of this kind recorded with a time resolution below 70 fs. The microscopic analysis shows that electron-phonon scattering is a major mechanism for electron transfer between surface and bulk states.}}, author = {{Töben, L. and Gundlach, L. and Ernstorfer, R. and Eichberger, R. and Hannappel, T. and Willig, F. and Zeiser, A. and Förstner, Jens and Knorr, A. and Hahn, P. H. and Schmidt, W. G.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{6}}, publisher = {{American Physical Society (APS)}}, title = {{{Femtosecond Transfer Dynamics of Photogenerated Electrons at a Surface Resonance of Reconstructed InP(100)}}}, doi = {{10.1103/physrevlett.94.067601}}, volume = {{94}}, year = {{2005}}, } @article{4264, abstract = {{We demonstrate that the temporal pulse phase remains essentially unaltered before separate phase characteristics are developed when propagating high-intensity pulses coherently on the exciton resonance of an optically thick semiconductor. This behavior is a clear manifestation of self-induced transmission and pulse breakup into solitonlike pulses due to Rabi flopping of the carrier density. Experiments using a novel fast-scan cross-correlation frequency-resolved optical gating (XFROG) method are in good agreement with numerical calculations based on the semiconductor Bloch equations.}}, author = {{Nielsen, N. C. and zu Siederdissen, T. Höner and Kuhl, J. and Schaarschmidt, M. and Förstner, Jens and Knorr, A. and Giessen, H.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, keywords = {{tet_topic_qd}}, number = {{5}}, publisher = {{American Physical Society (APS)}}, title = {{{Phase Evolution of Solitonlike Optical Pulses during Excitonic Rabi Flopping in a Semiconductor}}}, doi = {{10.1103/physrevlett.94.057406}}, volume = {{94}}, year = {{2005}}, }