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We investigate the formation of rotational coherence of N2+ resonantly interacting with an intense femtosecond laser field by numerical simulations based on a strong-field ionization-coupling model described with the density matrix formalism. The created N2+ system is unique in many aspects: the variable total population within the pump duration due to the intensity-dependent ionization injection, the readily accessible resonance owing to the effect of Stark shift, and the involvement of a few dozen of quantum states. By regarding the N2+ system as an open and non-stationary Λ-type cascaded multi-level system, we quantitatively studied the dependence of rotational coherence in different electronic-vibrational states of N2+ on the alignment angle θ and the pumping intensity.
View Article and Find Full Text PDFProposed Rabi-Kondo correlated state in a laser-driven semiconductor quantum dot.
Phys Rev Lett
October 2013
Institute for Quantum Electronics, ETH Zürich, CH-8093 Zürich, Switzerland and Dahlem Center for Complex Quantum Systems and Institut für Theoretische Physik, FU Berlin, D-14195 Berlin, Germany.
Spin exchange between a single-electron charged quantum dot and itinerant electrons leads to an emergence of Kondo correlations. When the quantum dot is driven resonantly by weak laser light, the resulting emission spectrum allows for a direct probe of these correlations. In the opposite limit of vanishing exchange interaction and strong laser drive, the quantum dot exhibits coherent oscillations between the single-spin and optically excited states.
View Article and Find Full Text PDFAttosecond plasma wave dynamics in laser-driven cluster nanoplasmas.
Phys Rev Lett
April 2012
Department of Physics, University of Ottawa, Ottawa, Ontario, Canada.
We introduce a microscopic particle-in-cell approach that allows bridging the microscopic and macroscopic realms of laser-driven plasma physics. As a first application, resonantly driven cluster nanoplasmas are investigated. Our analysis reveals an attosecond plasma-wave dynamics in clusters with radii R is approximately equal to 30 nm.
View Article and Find Full Text PDFBose-Einstein condensation of stationary-light polaritons.
Phys Rev Lett
October 2008
Fachbereich Physik, Technische Universität Kaiserslautern, Kaiserslautern, Germany.
We propose and analyze a mechanism for Bose-Einstein condensation of stationary dark-state polaritons. Dark-state polaritons (DSPs) are formed in the interaction of light with laser-driven 3-level Lambda-type atoms and are the basis of phenomena such as electromagnetically induced transparency, ultraslow, and stored light. They have long intrinsic lifetimes and in a stationary setup, a 3D quadratic dispersion profile with variable effective mass.
View Article and Find Full Text PDFResonantly laser-driven plasma waves for electron acceleration.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics
April 1995
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