893 research outputs found
Nanoplasmonic Lattices for Ultracold atoms
We propose to use sub-wavelength confinement of light associated with the
near field of plasmonic systems to create nanoscale optical lattices for
ultracold atoms. Our approach combines the unique coherence properties of
isolated atoms with the sub-wavelength manipulation and strong light-matter
interaction associated with nano-plasmonic systems. It allows one to
considerably increase the energy scales in the realization of Hubbard models
and to engineer effective long-range interactions in coherent and dissipative
many-body dynamics. Realistic imperfections and potential applications are
discussed.Comment: 5 pages, 3 figures, V2: minor changes, V3: minor changes, added
supplemental materia
Design and Tests of the Silicon Sensors for the ZEUS Micro Vertex Detector
To fully exploit the HERA-II upgrade,the ZEUS experiment has installed a
Micro Vertex Detector (MVD) using n-type, single-sided, silicon micro-strip
sensors with capacitive charge division. The sensors have a readout pitch of
120 micrometers, with five intermediate strips (20 micrometer strip pitch). The
designs of the silicon sensors and of the test structures used to verify the
technological parameters, are presented. Results on the electrical measurements
are discussed. A total of 1123 sensors with three different geometries have
been produced by Hamamatsu Photonics K.K. Irradiation tests with reactor
neutrons and Co-60 photons have been performed for a small sample of sensors.
The results on neutron irradiation (with a fluence of 1 x 10^{13} 1 MeV
equivalent neutrons / cm^2) are well described by empirical formulae for bulk
damage. The Co-60 photons (with doses up to 2.9 kGy) show the presence of
generation currents in the SiO_2-Si interface, a large shift of the flatband
voltage and a decrease of the hole mobility.Comment: 33 pages, 25 figures, 3 tables, accepted for publication in NIM
3+1 dimensional Yang-Mills theory as a local theory of evolution of metrics on 3 manifolds
An explicit canonical transformation is constructed to relate the physical
subspace of Yang-Mills theory to the phase space of the ADM variables of
general relativity. This maps 3+1 dimensional Yang-Mills theory to local
evolution of metrics on 3 manifolds.Comment: 7 pages, revte
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