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Creator | Title | Description | Subject | Date |
| 1 |
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Kieda, David B. | Antarctic impulsive transient antenna (ANITA) instrumentation | We will report on the details of the ANITA instrument. This instrument is fundamentally a broadband antenna, which is arrayed and constructed in such a way as to be optimized for the detection and characterization of high-energy neutrino cascades [1]. The requirement to maximize the detector view of... | ANITA; Antarctic Impulsive Transient Antenna; Neutrino; Balloon; Antarctica | 2003 |
| 2 |
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Vardeny, Zeev Valentine | Excitons, polarons, and laser action in poly(p-phenylene vinylene) films | We have used a multitude of linear and nonlinear cw optical spectroscopies to study the optical properties of water precursor poly(p-phenylene vinylene) (PPV) thin films. These spectroscopies include absorption, photoluminescence, photoinduced absorption and their respective optically detected magne... | PPV films; Excitons; Laser action; Poly(p-phenylene vinylene) | 2003 |
| 3 |
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Kieda, David B. | High resolution charge measurements of UH cosmic ray nuclei using a direct imaging Cherenkov ground-based observatory | The accurate determination of the elemental composition of cosmic rays at high energies is expected to provide crucial clues on the origin of these particles. Here we discuss a technique that has become possible through the use of modern ground-based Cherenkov imaging detectors. We combine a measure... | Cherenkov light; Quark star; UH nuclei; Magnetic monopole | 2003 |
| 4 |
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Lupton, John Mark | One and two-photon photocurrents from tunable organic microcavity photodiodes | We have constructed multilayer thin-film organic microcavity photodiodes with the photoactive layer comprised of a spin-coated conjugated polymer and an evaporated C60 layer. The electrodes are designed as semitransparent mirrors which form a resonant cavity structure. The photocurrent spectra show ... | Photocurrents; Microcavity photodiodes; Tunable photodiodes | 2003 |
| 5 |
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Kieda, David B. | Overview of the ANITA project | The ANITA project is designed to investigate ultra-high energy (>1017 eV) cosmic ray interactions throughout the universe by detecting the neutrinos created in those interactions. These high energy neutrinos are detectable through their interactions within the Antarctic ice sheet, which ANITA will u... | ANITA; Antarctic Impulsive Transient Antenna; High energy neutrinos; Antarctica; Balloon | 2003 |
| 6 |
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Wu, Yong-Shi | Quantum phase transition and engineering in two-component BEC in optical lattices | In this paper we review recent progress in studying quantum phase transitions in one- and two-component Bose-Einstein condensates (BEC) in optical lattices. These phase transitions involve the emergence and disappearance of quantum coherence over whole optical lattice and of linear superposition of... | | 2003 |
| 7 |
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Lupton, John Mark | Recombination kinetics in wide gap electroluminescent conjugated polymers with on-chain emissive defects | We analyze the experimental dependence of temporally and spectrally resolved electroluminescence (EL) from polyfluorene-based light-emitting diodes on electric field and temperature. The blue band in the EL spectrum is caused by emission from the polymer backbone, while the low-energy green emission... | Recombination kinetics; On-chain emissive defects; Wide gap; Blue-emitting; Green-emitting; Excitons | 2003 |
| 8 |
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Kieda, David B. | Science capabilities of the VERITAS array of 10m imaging atmospheric Cherenkov gamma-ray detectors | The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of seven 10m aperture telescopes used for gamma-ray astronomy in the 50 GeV to 50 TeV (1 TeV= 101 2 electron Volt) energy range. The gamma rays are detected by measuring the optical Cherenkov light emitted by the casc... | VERITAS | 2003 |
| 9 |
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Rogachev, Andrey | Superconducting properties of polycrystalline Nb nanowires templated by carbon nanotubes | Continuous Nb wires, 7-15 nm in diameter, have been fabricated by sputter-coating single fluorinated carbon nanotubes. Transmission electron microscopy revealed that the wires are polycrystalline, having grain sizes of about 5 nm. The critical current of wires thicker than ~12 nm is very high (107 A... | Polycrystalline Nb; Carbon nanotubes; Langer-Ambegaokar-McCumber-Halperin; Phase slips | 2003 |
| 10 |
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DeTar, Carleton | Chiral logs with staggered fermions | We compute chiral logarithms in the presence of "taste" symmetry breaking of staggered fermions. The lagrangian of Lee and Sharpe is generalized and then used to calculate the logs in π and K masses. We correct an error in Ref. [1]; the issue turns out to have implications for the comparison with ... | Staggered fermions; Chiral logs | 2003-05 |
| 11 |
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Mishchenko, Eugene | Coulomb drag by small momentum transfer between quantum wires | We demonstrate that in a wide range of temperatures Coulomb drag between two weakly coupled quantum wires is dominated by processes with a small interwire momentum transfer. Such processes, not accounted for in the conventional Luttinger liquid theory, cause drag only because the electron dispersion... | Coulomb drag; Quantum wires; Luttinger liquid | 2003-09 |
| 12 |
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Boehme, Christoph | Electrical detection of spin coherence in silicon | Experimental evidence is presented showing that photocurrents in silicon can be used as highly sensitive readout probes for coherent spin states of localized electrons, the prime candidates for quantum bits in various semiconductor based quantum computer concepts. Conduction electrons are subjected ... | Spin coherence; Electronic transitions; Rabi oscillation | 2003-12 |
| 13 |
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DeTar, Carleton | Exotic hybrid mesons from improved Kogut-Susskind fermions | We summarize our measurement of the mass of the exotic 1−+ hybrid meson using an improved Kogut-Susskind action. We show results from both quenched and dynamical quark simulations and compare with results from Wilson quarks. Extrapolation of these results to the physical quark mass allows compar... | Chromomagnetic field; Kogut-Susskind fermions; Wilson quarks | 2003-05 |
| 14 |
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Vardeny, Zeev Valentine | Fabrication and properties of gallium metallic photonic crystals | Gallium metallic photonic crystals with 100% filling factor have been fabricated via infiltration of liquid gallium into opals of 300-nm silica spheres using a novel high pressure-high temperature technique. The electrical resistance of the Ga-opal crystals was measured at temperatures from 10 to 2... | | 2003-10 |
| 15 |
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Gondolo, Paolo | Fluid interpretation of Cardassian expansion | A fluid interpretation of Cardassian expansion is developed. Here, the Friedmann equation takes the form H2=g(ρM) where ρM contains only matter and radiation ~no vacuum!. The function g(ρM) returns to the usual 8πM /(3mpl 2 ) during the early history of the Universe, but takes a different form... | Cardassian expansion; Friedmann equation | 2003-09 |
| 16 |
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DeTar, Carleton | Heavy-light meson decay constants with N f = 3 | During the past year the MILC Collaboration has continued its study of heavy-light meson decay constants with three dynamical quarks. Calculations have been extended to a second lattice spacing of about 0.09 fm. At this lattice spacing, there are results in the quenched approximation and for thr... | Dynamical quarks | 2003-05 |
| 17 |
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Gondolo, Paolo | Improved constraints on supersymmetric dark matter from muon g-2 | The new measurement of the anomalous magnetic moment of the muon by the Brookhaven AGS experiment 821 again shows a discrepancy with the standard model value. We investigate the consequences of these new data for neutralino dark matter, updating and extending our previous work [E. A. Baltz and P. ... | Magnetic moment; Neutralinos | 2003-03 |
| 18 |
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Gondolo, Paolo | Indirect detection of a subdominant density component of cold dark matter | We examine the detectability through indirect means of weakly interacting dark matter candidates that may constitute not all but only a subdominant component of galactic cold dark matter. We show that the possibility of indirect detection of neutralinos from their annihilations in the Earth and Su... | WIMP; Weakly interacting massive particles; Annihilations | 2003-01 |
| 19 |
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DeTar, Carleton | Lattice calculation of 1-+ hybrid mesons with improved Kogut-Susskind fermions | We report on a lattice determination of the mass of the exotic 1-+ hybrid meson using an improved Kogut-Susskind action. Results from both quenched and dynamical quark simulations are presented. We also compare with earlier results using Wilson quarks at heavier quark masses. The results on lattice... | Staggered quarks; Kogut-Susskind fermions | 2003-10 |
| 20 |
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DeTar, Carleton | Light hadron properties with improved staggered quarks | Preliminary results from simulations with 2+1 dynamical quark flavors at a lattice spacing of 0.09 fm are combined with earlier results at a = 0.13 fm. We examine the approach to the continuum limit and investigate the dependence of the pseudoscalar masses and decay constants as the sea and valence... | Staggered quarks | 2003-05 |
| 21 |
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Vardeny, Zeev Valentine; Ehrenfreund, Eitan A. | Linear and nonlinear photoexcitation dynamics in ∏-conjugated polymers | Linear and nonlinear recombination kinetics with various lifetime distributions were identified for long-lived photoexcitations in a series of rr-conjugated polymer films using modulation frequency and excitation intensity dependencies of the photoinduced absorption. This includes monomolecular, bim... | Linear photoexcitation; Nonlinear photoexcitation; pi-conjugated polymers; Recombination kinetics | 2003-01 |
| 22 |
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Lupton, John Mark | Linewidth-limited energy transfer in single conjugated polymer molecules | Using low temperature single molecule spectroscopy on rigid-rod conjugated polymers we are able to identify homogeneously broadened, strongly polarized emission from individual chromophore units on a single chain. Gated fluorescence spectroscopy allows real time imaging of intramolecular energy tran... | Linewidth-limited; Energy transfer; Rigid-rod; Single molecule spectroscopy; Gated fluorescence spectroscopy; Chromophores; Intramolecular energy transfer; Spectral linewidth | 2003-12 |
| 23 |
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Gondolo, Paolo | Measuring the prompt atmospheric neutrino flux with down-going muons in neutrino telescopes | In the TeV energy region and above, the uncertainty in the level of prompt atmospheric neutrinos would limit the search for diffuse astrophysical neutrinos. We suggest that neutrino telescopes may provide an empirical determination of the flux of prompt atmospheric electron and muon neutrinos by mea... | Neutrino telescopes; Prompt flux | 2003-01 |
| 24 |
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Wu, Yong-Shi | Moyal representation of the string field star product in the presence of a B background | In this paper we show that in the presence of an antisymmetric tensor B background, Witten's star algebra for open string fields persists to possess the structure of a direct product of commuting Moyal pairs. The interplay between the noncommutativity due to three-string overlap and that due to the ... | String theory; Moyal pairs; Moyal structure; Noncommutativity | 2003-06 |
| 25 |
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Mattis, Daniel C. | Partially frustrated Ising models in two dimensions | We examine ordered, periodic, Ising models on a sq lattice at varying levels x of frustration. The thermodynamic singularity of the fully frustrated model (x=1) is at T=0 while those of partially frustrated lattices (0<x<1) occur at finite Tc . The critical indices in the partially frustrated latti... | Antiferromagnets; Frustration; Ising chain | 2003-06 |
