| | Creator | Title | Description | Subject | Date |
|---|
| 1 |  | Ailion, David Charles | 109Ag NMR investigation of atomic motions in the incommensurate and paraelectric phases of proustite (Ag3AsS3) | 109Ag NMR line shape, T1 , Hahn spin echo, and Carr-Purcell-Meiboom-Gill ~CPMG! spin-echo measurements were performed in proustite (Ag3AsS3) between 420 and 47 K in order to understand the role of atomic motions in phase transitions in a system containing an incommensurate phase. These measurements ... | NMR; Atomic motion; Proustitie; Phase transitions; Line shape | 2000 |
| 2 |  | Mattis, Daniel C. | Accuracy of bosonization for localized interactions | Bosonization is commonly used to calculate the ground-state energy and the dynamics of simple model nonmagnetic impurities in metals. We analyze the accuracy of this procedure in the calculation of the ground-state energy of a simple, solvable, model. | Fermions; Electrons; Magnetic | 2000 |
| 3 |  | Lupton, John Mark | Bragg scattering from periodically microstructured light emitting diodes | We present a simple method of generating a periodic wavelength scale structure in the optically active layer of a light emitting diode. This is achieved by solution deposition of a light emitting polymer on top of a corrugated substrate. The periodic structure allows waveguide modes normally trapped... | Bragg scattering; Periodic wavelength scale structure | 2000 |
| 4 |  | Boehme, Christoph | Diffusion of hydrogen and deuterium in stack systems of SixNyHz/SixNyDz and crystalline Si | H/D-, N-H/D- and Si-H/D-bond density changes were investigated in stacks consisting of a Cz-Si substrate, a thin layer of SiC>2, amorphous deuterated silicon nitride as well as amorphous hydrogenated silicon nitride in order to see if the post deposition anneal of a-SixNyHz layers on crystalline sil... | Hydrogenated silicon nitride; Anneal process | 2000 |
| 5 |  | Williams, Clayton C. | Electron tunneling detected by electrostatic force | A method is introduced for measuring the tunneling of electrons between a specially fabricated scanning probe microscope tip and a surface. The technique is based upon electrostatic force detection of charge as it is transferred to and from a small (10217 F) electrically isolated metallic dot on the... | Electrons; Tunneling events; Electrostatic force microscopy | 2000 |
| 6 |  | Kieda, David B. | Evidence for changing of cosmic ray composition between 10(17) and 10(18) eV from multicomponent measurements | The average mass composition of cosmic rays with primary energies between 1017 and 1018 eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the ... | Cosmic rays; Particle energy; Muon array | 2000 |
| 7 |  | Boehme, Christoph | H loss mechanism during anneal of silicon nitride: chemical dissociation | Remote plasma enhanced chemical vapor deposited silicon nitride (SixNyHz), produced at high ammonia to silane flow rates (ammonia rich) shows a reduction of hydrogen during rapid thermal anneal at temperatures that exceed the deposition temperature. This H release could be either due to a ‘‘slow... | Anneal | 2000 |
| 8 |  | Ailion, David Charles | Nature of the incommensurate-paraelectric transition: a two dimensional exchange-difference NMR study | 87Rb two-dimensional exchange-difference NMR was used to study collective motions in the incommensurate (I) and paraelectric (P) phases of Rb2ZnCl4, which elucidate the nature of the I-P transition. We measured the cross-peak frequency displacement vs mixing time and observed a gradual increase towa... | Incommensurate systems; NMR; Paraelectric phase | 2000 |
| 9 |  | Gondolo, Paolo | Neutralino dark matter vs galaxy formation | Neutralino dark matter may be incompatible with current cold dark matter models with cuspy dark halos, because excessive synchrotron radiation may originate from neutralino annihilations close to the black hole at the galactic center. | Neutralinos; Cuspy dark halos | 2000 |
| 10 |  | Vardeny, Zeev Valentine | Spectral analysis of polymer microring lasers | The emission spectra of microring lasers made of p-conjugated polymer films that coat glass optical fibers are analyzed with the help of a Fourier transform. This method allows for the assignment of photopumped emission lines to integral Bessel functions and a more precise determination of the lase... | Microring lasers; pi-conjugated polymers | 2000 |
| 11 |  | DeTar, Carleton | Critical behavior in Nt=4 staggered fermion thermodynamics | Quantum chromodynamics with two zero mass flavors is expected to exhibit a phase transition with O(4) critical behavior. Fixing the universality class is important for phenomenology and for facilitating the extrapolation of simulation data to physical quark mass values. Other groups have reported r... | Staggered fermions; Phase transitions; Quark-gluon plasma; Chiral symmetry | 2000-01 |
| 12 | | DeTar, Carleton | Critical behavior in Nt=4 staggered fermion thermodynamics | Quantum chromodynamics with two zero mass flavors is expected to exhibit a phase transition with O(4) critical behavior. Fixing the universality class is important for phenomenology and for facilitating the extrapolation of simulation data to physical quark mass values. Other groups have reported r... | Staggered fermions; Phase transitions | 2000-01 |
| 13 |  | Vardeny, Zeev Valentine; Raikh, Mikhail E. | Emission spectrum of a dipole in a semi-infinite periodic dielectric structure: effect of the boundary | The emission spectrum of a dipole embedded in a semi-infinite photonic crystal is calculated. For simplicity we study the case in which the dielectric function is sinusoidally modulated only along the direction perpendicular to the boundary surface plane. In addition to oscillations of the emission... | Emission spectrum; Dipole; Periodic dielectric structure | 2000-07 |
| 14 |  | Sokolsky, Pierre | Energy estimation of UHE cosmic rays using the atmospheric fluorescence technique | We use the CORSIKA air shower simulation program to review the method for assigning energies to ultra-high energy (UHE) cosmic rays viewed with the air fluorescence technique. This technique uses the atmosphere as a calorimeter, and we determine the corrections that must be made to the calorimetric ... | Fluorescence; Energy estimation; Ultra-high energy cosmic rays | 2000-08 |
| 15 | | Sokolsky, Pierre | Evidence for changing of cosmic ray composition between 10^17 and 10^18 eV from multicomponent measurements | The average mass composition of cosmic rays with primary energies between 1017 and 1018 eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the... | Extensive air showers; Fluorescence; Energy spectrum; Muon density; Cherenkov light | 2000-05 |
| 16 |  | Vardeny, Zeev Valentine | Film morphology and photophysics of polyfluorene | We have studied the interplay between photophysics and film morphology of poly(9,9-dioctyl)fluorene (PFO) using a variety of optical probes. Upon slowly warming a spin-cast PFO film from 80 to 300 K, a fraction of the sample is transformed into a different solid phase, the ß phase. Absorption and e... | Polyfluorene; Photophysics; Film morphology | 2000-12 |
| 17 |  | DeTar, Carleton | First signs for string breaking in two-flavor QCD | We have been examining the phenomenon of string breaking in QCD with two flavors of dynamical staggered quarks. We construct a transfer matrix from a combination of "string" and "two-meson" channels. Preliminary results with low statistics show the expected signs of string breaking. | String breaking; Wilson loop; Staggered quarks | 2000-04 |
| 18 |  | DeTar, Carleton | Heavy-light decay constants with dynamical gauge configurations and Wilson or improved valence quark actions | We describe a calculation of heavy-light decay constants including virtual quark loop effects. We have generated dynamical gauge configurations at three _x000C_ values using two flavors of Kogut-Susskind quarks with a range of masses. These are analyzed with a Wilson valence quark action. Prelimin... | Decay constants; Kogut-Susskind quarks; Wilson quarks; Fat-clover valence quarks | 2000-04 |
| 19 |  | Wu, Yong-Shi | Holography and noncommutative Yang-Mills theory | In this Letter a recently proposed gravity dual of noncommutative Yang-Mills theory is derived from the relations between closed string moduli and open string moduli recently suggested by Seiberg and Witten. The only new input one needs is a simple form of the running string tension as a function ... | Noncommutativity; String theory; Gravity dual | 2000-03 |
| 20 |  | Vardeny, Zeev Valentine | Lasing and stimulated emission in ∏-conjugated polymers | Recent studies of lasing and stimulated emission in luminescent -conjugated polymers performed by our group are presented. Optical properties of cylindrical high- polymer microcavities are discussed. The emission spectra of plastic microring and microdisk lasers are measured and analyzed. Light-emi... | Lasing; Stimulated emission; pi-conjugated polymers; Microcavities; Polymer lasers | 2000-01 |
| 21 |  | Vardeny, Zeev Valentine; Raikh, Mikhail E. | Mesoscopic cooperative emission from a disordered system | We study theoretically the cooperative light emission from a system of N»1 classical oscillators confined within a volume with spatial scale L much smaller than the radiation wavelength λο=2rrc/ω0. We assume that the oscillator frequencies are randomly distributed around a central frequency ω... | Mesoscopic cooperative emission; Disordered systems; Oscillators | 2000-05 |
| 22 |  | Mishchenko, Eugene | Nonlinear voltage dependence of the shot noise in mesoscopic degenerate conductors with strong electron-electron scattering | It is shown that measurements of zero-frequency shot noise can provide information on electron-electron interaction, because the strong interaction results in the nonlinear voltage dependence of the shot noise in metallic wires. This is due to the fact that the Wiedemann-Franz law is no longer vali... | Shot noise; Degenerate conductors | 2000-11 |
| 23 |  | DeTar, Carleton | Potts flux tube model at nonzero chemical potential | We model the deconfinement phase transition in quantum chromodynamics at nonzero baryon number density and large quark mass by extending the flux tube model ~three-state, three-dimensional Potts model! to nonzero chemical potential. In a direct numerical simulation we confirm mean-field-theory pre... | Phase transitions; Quark-gluon plasma; Chemical potential; Potts model | 2000-03 |
| 24 |  | Gondolo, Paolo | Prompt atmospheric neutrinos and muons: dependence on the gluon distribution function | We compute the next-to-leading order QCD predictions for the vertical flux of atmospheric muons and neutrinos from decays of charmed particles, for different PDF's (MRS-R1, MRS-R2, CTEQ-4M and MRST) and different extrapolations of these at a small partonic momentum fraction x. We find that the predi... | Neutrino telescopes; Charm; Atmospheric flux; Prompt flux | 2000-02 |
| 25 |  | Gondolo, Paolo | Prompt atmospheric neutrinos and muons: NLO vs LO QCD predictions | We compare the leading and next-to-leading order QCD predictions for the flux of atmospheric muons and neutrinos from decays of charmed particles. We find that the full NLO lepton fluxes can be approximated to within ~10% by the Born-level fluxes multiplied by an overall factor of 2.2-2.4, which d... | Atmospheric flux; Prompt flux; Charm | 2000-01 |
