1,720,980 research outputs found
Coherent Control of Dressed Matter Waves
No full textWe demonstrate experimentally that matter waves can be coherently and adiabatically loaded and controlled in one-, two-, and three-dimensional strongly driven optical lattices. This coherent control is then used in order to reversibly induce the superfluid-Mott insulator phase transition by changing the strength of the driving. Our findings pave the way for studies of driven quantum systems and new methods for controlling matter waves
The microwave Stark and Fourier transform spectra, structure and quadrupole coupling constants of 1,2-dicyanocyclobutene
No full textThe microwave spectrum of 1,2-dicyanocyclobutene, C4H4(CN)(2), has been investigated using a Stark microwave spectrometer in the 11.0-34.0 GHz spectral region, and a Fourier transform microwave spectrometer in the 6-18 GHz region. The ground and several vibrationally excited states of the parent species have been assigned, as have the ground state of several C-13 and N-15 isotopomers. The nuclear quadrupole coupling constants of the N-14 nucleus have been determined for several species. The effective (r(0)) structure of the molecule has been derived. The substitution (r(s)) structure of the heavy atoms has also been calculated. An anomalously short carbon-carbon double bond of 132.6(2) pm was found by the substitution method. This short bond length is shown to be unreliable. Advanced quantum chemical calculations have been carried out for the title compound as well as for the cyclobutene prototype. An accurate estimate of the equilibrium (r(c)) structures of cyclobutene as well as of 1,2-dicyanocyclobutene based on quantum chemical calculations has been made. (C) 2002 Elsevier Science B.V. All rights reserved
Exploring dynamic localization with a Bose-Einstein condensate
No full textWe report on the experimental observation of dynamic localization of a Bose-Einstein condensate in a shaken optical lattice, both for sinusoidal and square-wave forcing. The formulation of this effect in terms of a quasienergy band collapse, backed by the excellent agreement of the observed collapse points with the theoretical predictions, suggests the feasibility of systematic quasienergy band engineering
The microwave Stark and Fourier transform spectra, structure and quadrupole coupling constants of 1,2-dicyanocyclobutene (vol 615, pg 315, 2002)
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Observation of nonlinearity-induced suppression of resonant tunneling in the Wannier-Stark problem
No full textObservation of nonlinearity-induced suppression of resonant tunneling in the Wannier-Stark proble
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