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Creator | Title | Description | Subject | Date |
101 |
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Vardeny, Zeev Valentine | Symmetric light emitting divices from poly(p-di ethynylene phenylene) (p-di phenylene vinylene) derivatives | Light emitting devices were fabricated from 2,5-dialkoxy derivatives of poly(p-di ethynylene phenylene-p-di phenylene vinylene) (PDEPDPV) sandwiched between indium tin oxide (ITO) and Al. The current-voltage (Iel-V) curve, electroluminescence (EL) intensity-voltage (IEL-V) curve, and the EL spectra ... | Poly(p-di ethynylene phenylene); PPV; Pi-conjugated polymers | 1995 |
102 |
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Dawson, Kyle | Radiation tolerance of high-resistivity LBNL CCDs | Thick, fully-depleted p-channel charge-coupled devices (CCDs) have been developed at the Lawrence Berkeley National Laboratory (LBNL). These CCDs have several advantages over conventional n-channel CCDs, including enhanced quantum efficiency and reduced fringing at near-infrared wavelengths, a smal... | P-Channel CCDs; Astrophysics instrumentation; Space instrumentation; SNAP satellite; Space-based telescopes | 2006-10 |
103 |
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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 |
104 |
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Vardeny, Zeev Valentine | Evidence for excimer photoexcitations in an ordered ?-conjugated polymer film | We report pressure-dependent transient picosecond and continuous-wave photomodulation studies of disordered and ordered films of 2-methoxy-5-(2-ethylhexyloxy) poly(para-phenylenevinylene). Photoinduced absorption (PA) bands in the disordered film exhibit very weak pressure dependence and are assign... | | 2011 |
105 |
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Vardeny, Zeev Valentine | Spectral analysis of near threshold random lasers | Emission spectra from random lasing systems typically have numerous narrow resonant lines. When excited very near to the laser threshold there are fewer resonant lines which clarify the emission spectrum analysis. We studied three different random lasing systems including ?-conjugated polymer films... | | 2012 |
106 |
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DeTar, Carleton | Light hadron spectrum - MILC results with the Kogut-Susskind and Wilson actions* | We present the current status of our ongoing calculations of the light hadron spectrum with both Kogut-Susskind (KS) and Wilson quarks in the valence or quenched approximation. We discuss KS quarks first and find that the chiral extrapolation is potentially the biggest source of systematic error. F... | Staggered quarks; Hadron spectrum; Kogut-Susskind quarks; Wilson quarks; Chiral extrapolation | 1998-01 |
107 |
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Wu, Yong-Shi | Quantum group, Bethe ansatz equations, and Bloch wave functions in magnetic fields | The wave functions for a two-dimensional Bloch electron in uniform magnetic fields at the mid-band points are studied by exploiting a connection to the quantum group Uq(sl2): A linear combination of its generators gives the Hamiltonian. We apply both analytic and numerical methods to obtain and an... | Bloch electron | 1996-04 |
108 |
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Lupton, John Mark | Intrinsic room-temperature electrophosphorescence from a π-conjugated polymer | Electrically induced phosphorescence from a poly(para-phenylene) ladder-type polymer is observed for the first time and characterized using time resolved spectroscopy. Short-lived phosphorescence is also observed in gated fluorescence spectra and is found to be quenched reversibly by oxygen. Therm... | pi-conjugated polymers; Electrophosphorescence; Ladder-type polymer; Gated fluorescence spectra | 2002-09 |
109 |
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Boehme, Christoph | Triplet recombination at Pb centers and its implications for capture cross sections | Pulsed electrically detected magnetic resonance measurements are presented showing that Pb centers at the crystalline silicon (c-Sid) (111) to silicon dioxide sSiO2d interface can cause recombination of strongly coupled spin pairs in singlet and triplet configurations. The implication of these find... | Silicon interfaces | 2005 |
110 |
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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 |
111 |
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Vardeny, Zeev Valentine | Transient-photomodulation-spectroscopy studies of carrier thermalization and recombination in α-Si:H | The transient response of mid-gap absorption in a-Si:H to pulsed optical excitation is studied as a function of time (300 ns to 30 ms) and sample temperature (10-220 K) with use of probe wavelengths ranging from 0.75 to 5.5 fim. A numerical inversion process applied to the data gives the distributio... | Amorphous silicon; a-Si:H; Transient-photomodulation-spectroscopy; Carrier thermalization; Carrier recombination; Pulsed optical excitation | 1988-07 |
112 |
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Gondolo, Paolo | Indirect detection of dark matter in km-size neutrino telescopes | Neutrino telescopes of kilometer size are currently being planned. They will be two or three orders of magnitude bigger than presently operating detectors, but they will have a much higher muon energy threshold. We discuss the trade-off between area and energy threshold for indirect detection of neu... | Neutrino telescopes; Energy threshold; Neutralino annihilations; Supersymmetric models | 1998-11 |
113 |
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Lupton, John Mark | Device model for polymer light emitting diodes: effect of temperature and oxidation | We present a temperature-dependent single carrier device model for polymer light-emitting diodes. The model includes both the injection of charge carriers over a barrier and the transport of charges across the device. To test the model, the temperature dependence of an LED based on the conjugated po... | Single carrier; Temperature dependent; Poly(phenylene vinylene); Transport measurements; ITO; Disorder | 1999 |
114 |
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Vardeny, Zeev Valentine | Photoresponse and electroresponse of polymers light emitting diodes | We have studied the photoresponse and electroresponse of light emitting diodes (LEDs ) made from a variety of soluble conducting polymers sandwiched between indium tin oxide (ITO) and metals including calcium, aluminum and copper. Under illumination all freshly prepared LEDs exhibit relatively large... | Photoresponse; Electroresponse; Photovoltage; I-V curves | 1995 |
115 |
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Ailion, David Charles | Nuclear double resonance: cross relaxation rates between two spin species | A rotating-frame nuclear-double-resonance experiment is reported in which the cross-relaxation rates between 7Li and 6Li in powdered lithium metal were measured. The theory developed my McArthur, Hahn, and Walstedt (MHW) is applied to these data and good agreement is obtained. We also apply this t... | Nuclear-double-resonance; Lithium; MHW; Cross-relaxation | 1977 |
116 |
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Saam, Brian | Universal long-time behavior of nuclear spin decays in a solid | Magnetic resonance studies of nuclear spins in solids are exceptionally well suited to probe the limits of statistical physics. We report experimental results indicating that isolated macroscopic systems of interacting nuclear spins possess the following fundamental property: spin decays that start ... | Nuclear spin decays; Hyperpolarized solid xenon; Chaos | 2008-08 |
117 |
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Boehme, Christoph | Spin-dependent processes at the crystalline Si-SiO2 interface at high magnetic fields | An experimental study on the nature of spin-dependent excess charge-carrier transitions at the interface between (111)-oriented phosphorous-doped ([P]) ~ 1015 cm−3) crystalline silicon and silicon dioxide at high magnetic field (B0~8.5 T) is presented. Electrically detected magnetic-resonance (E... | Silicon interfaces; Spin-dependent recombination | 2008-07 |
118 |
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Symko, Orest George | Observation of a narrow pseudogap near the Fermi level of AlCuFe quasicrystalline thin films | We present the first experimental determination by tunneling spectroscopy of the density of states (DOS) close to the Fermi energy of AlCuFe quasicrystalline thin film samples. The measurements show that the Fermi level in a quasicrystal lies in a deep narrow pseudogap 60 m e V wide. Above an applie... | AlCuFe; Quasicrystalline thin films; Pseudogap; Fermi level; Density of states; DOS | 1995-05 |
119 |
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Boehme, Christoph | Ultra-sensitive electrical detection of spin Rabi oscillation at paramagnetic defects | A short review of the pulsed electrically detected magnetic resonance (pEDMR) experiment is presented. PEDMR allows the highly sensitive observation of coherent electron spin motion of charge carriers and defects in semiconductors by means of transient current measurements. The theoretical foundatio... | Rabi oscillations; Electron spin resonance; Paramagnetic defects | 2006-04 |
120 |
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Wu, Yong-Shi | Towards a noncommutative geometric approach to matrix compactification | In this paper we study generic M(atrix) theory compactifications that are specified by a set of quotient conditions. A procedure is proposed which both associates an algebra to each compactification and leads deductively to general solutions for the matrix variables. The notion of noncommutative g... | Matrix theory; Compactification; Noncommutativity; Orbifolds; Orientifolds; Spacetime; Klein bottle; Gauge theory; Torus | 1998-07 |
121 |
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Williams, Clayton C. | Mapping of mobile charges on insulator surfaces with the electrostatic force microscope | Migration of surface ions in lateral fields on insulator surfaces may modify the electrical characteristics of underlying semiconductor structures causing device instabilities. A high sensitivity electrostatic force microscope is used to image the movement and spatial distribution of surface ions on... | Insulator surfaces; Surface ions; Electrostatic force microscope | 1993 |
122 |
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Vardeny, Zeev Valentine | Phonon anomalies in Cu halides | A great number of the observed phonon anomalies in the zinc-blende phase of Cu-halide crystals are explained by means of a dynamical model. It is assumed that a Cu ion populates four equivalent off-center sites or its ideal position. The off-center Cu+ population is temperature and pressure dependen... | Phonon anomalies; Cu-halide crystals; Cuprous halides | 1979-03 |
123 |
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Sokolsky, Pierre | Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high energies | The Utah Fly's Eye detector has revealed a change in the cosmic ray composition which is correlated with structure in the all-particle energy spectrum. The data can be fitted by a simple model of a steep power law spectrum of heavy nuclei which is overtaken at high energies by a flatter spectrum of ... | Energy spectrum; Extensive air showers | 1993-11 |
124 |
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Mishchenko, Eugene | Zero-bias anomaly in two-dimensional electron layers and multiwall nanotubes | The zero-bias anomaly in the dependence of the tunneling density of states n (e) on the energy e of the tunneling particle for two- and one-dimensional multilayered structures is studied. We show that for a ballistic two-dimensional (2D) system the first-order interaction correction to density of s... | Spin-orbit coupling; Coulomb interaction | 2002-05 |
125 |
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DeTar, Carleton | Light quark spectrum with improved gauge and fermion actions | We report on a study of the light quark spectrum using an improved gauge action and both Kogut-Susskind and Naik quark actions. We have studied six different lattice spacings, corresponding to plaquette couplings ranging from 6.8 to 7.9, with five to six quark masses per coupling. We compare the t... | Quark spectrum; Kogut-Susskind quarks; Naik quarks | 1998-04 |