Filters: Department: "Physics" School Or College: "College of Science" Collection: "ir_uspace" Format: "application/pdf"
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 301 |
 |
Vardeny, Zeev Valentine | Spectroscopic study of spin-dependent exciton formation rates in ∏-conjugated semiconductors: comparison with electroluminescence techniques | It has been found in recent measurements that the singlet-to-triplet exciton ratio in organic light-emitting diodes (OLEDs) is larger than expected from spin degeneracy, and that singlet excitons form at a larger rate than triplets. We employed the technique of optically detected magnetic resonance... | Spin-dependent exciton formation; pi-conjugated polymers | 2004-12 |
| 302 |
 |
Vardeny, Zeev Valentine | Conjugation-length dependence of spin-dependent excition formations rates in ∏-conjugated oligomers and polymers | We have measured the ratio, r =ơ s/ơT of the formation cross section, ơ of singlet and triplet excitons from polarons in ∏-conjugated oligomer and polymer films, using a spectroscopic technique we developed recently. We discovered a universal relation between r and the conjugation length (CL): ... | pi-conjugated polymers; Conjugation length; Polaron recombination | 2002-04 |
| 303 |
 |
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 |
| 304 |
 |
Vardeny, Zeev Valentine; Ehrenfreund, Eitan A. | Spin-dependent kinetics of polaron pairs in organic light-emitting diodes studied by electroluminescence detected magnetic resonance dynamics | We describe a method for characterizing the spin-dependent kinetics of polaron pairs (PP) in polymer organic light-emitting diodes (OLEDs) made from a derivative of poly(phenylene-vinylene), using the dynamic response of spin- 1/2 electroluminescence detected magnetic resonance (ELDMR) compared wit... | Spin-dependent kinetics; Polaron pairs; Organic light-emitting diodes; OLED; ELDMR; CDMR; Interchain excitations; pi-conjugated polymers | 2008-11 |
| 305 |
 |
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 |
| 306 |
 |
Mattis, Daniel C. | Anomalous skin effect in a magnetic field | A classical and quantum mechanical derivation of cyclotron resonance in metals is given. The classical result differs slightly from that obtained by Azbel and Kaner. The quantum derivation yields the same result as the classical calculation except that in the limit of low quantum numbers or high m... | Cyclotron resonance; Skin effect; Quantum transport | 1958-07 |
| 307 |
 |
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 |
| 308 |
 |
Vardeny, Zeev Valentine | Mechanism for photogeneration of charge carriers in polyacetylene | In light of new experimental observations, a mechanism for the photogeneration of charge carriers in trans-polyacetylene is presented. By way of introduction, we discuss the qualitative changes in the picture of charged-soliton photogeneration that are expected due to the inclusion of electron corre... | Photogeneration; Charge carriers; Photocarriers | 1984-07 |
| 309 |
 |
Mattis, Daniel C. | Conductivity of one-dimensional interacting fermions* | Using an exactly soluble model, the decay rate of a current-carrying state of one-dimensional fermions is calculated in the presence of random scatterers at finite temperature and the dc conductivity thereby inferred. For interacting fermions it is modified by a factor (T/T + θ)g, where g is a posi... | Fermi gas | 1974-04 |
| 310 |
 |
DeTar, Carleton | Leptonic decay constants fDs and fD in three flavor lattice QCD | We determine the leptonic decay constants fDs and fD in three flavor unquenched lattice QCD. We use O(a2)-improved staggered light quarks and O(a)-improved charm quarks in the Fermilab heavy quark formalism. Our preliminary results, based upon an analysis at a single lattice spacing, are fDs = 263+5... | Decay constants | 2005-03 |
| 311 |
 |
Bromley, Benjamin C. | Periodic standing-wave approximation: nonlinear scalar fields, adapted corrdinates, and the eigenspectral method | The periodic standing wave (PSW) method for the binary inspiral of black holes and neutron stars computes exact numerical solutions for periodic standing-wave spacetimes and then extracts approximate solutions of the physical problem, with outgoing waves. The method requires solution of a boundary-... | Periodic standing wave method; Black holes; Neutron stars | 2005 |
| 312 |
 |
Vardeny, Zeev Valentine | Organic spin-valves: physics and applications | Spin-valve devices of organic semiconductors in the vertical configuration using a variety of exotic and regular ferromagnetic electrodes were fabricated and studied as a function of applied magnetic field, temperature and applied bias voltage. These devices show that spin polarized carriers can be ... | Organic spin-valves; Spin-polarized transport; Spin-polarized carrier injection; Spin polarization | 2005 |
| 313 |
 |
Wu, Yong-Shi | Manifestations of Berry's topological phase for the photon | Recently, Berry recognized in quantum mechanics a topological phase factor arising from the adiabatic transport of a system around a closed circuit, which is essentially the Aharonov-Bohm effect in parameter space. Here we consider manifestations of this phase factor for a photon in a state of adia... | Aharonov-Bohm effect; Optical fibers; Waveguide | 1986-08 |
| 314 |
 |
DeTar, Carleton | Topological susceptibility in staggered fermion chiral perturbation theory | The topological susceptibility of the vacuum in quantum chromodynamics has been simulated numerically using the Asqtad improved staggered fermion formalism. At nonzero lattice spacing, the residual fermion doublers (fermion tastes) in the staggered fermion formalism give contributions to the suscept... | Staggered fermions; Chiral perturbation | 2004-10 |
| 315 |
 |
Wu, Yong-Shi | Matrix compactification on orientifolds | Generalizing previous results for orbifolds, in this paper we describe the compactification of the matrix model on an orientifold which is a quotient space Rd/G as a Yang-Mills theory residing on a quantum space. The information of the compactification is encoded in the action of the discrete symmet... | Spacetime; Orientifolds; Compactification; Quantum space | 1999-06 |
| 316 |
 |
Wu, Yong-Shi | Explicit solutions of the Bethe ansatz equations for Bloch electrons in a magnetic field | For Bloch electrons in a magnetic field, explicit solutions are obtained at the center of the spectrum for the Bethe ansatz equations of Wiegmann and Zabrodin. When the magnetic flux per plaquette is 1/(Q with Q an odd integer, distribution of the roots of the Bethe ansatz equation is uniform except... | Bloch electron; Magnetic flux | 1994-08 |
| 317 |
 |
Williams, Clayton C. | Advances in experimental technique for quantitative two dimensional dopant profiling by scanning capacitance microscopy | Several advances have been made toward the achievement of quantitative two-dimensional dopant and carrier profiling. To improve the dielectric and charge properties of the oxide-silicon interface, a method of low temperature heat treatment has been developed which produces an insulating layer with c... | Doping; Scanning capacitance microscope; SCM | 1999 |
| 318 |
 |
Wu, Yong-Shi | Twisted supersymmetric invariant formulation of Chern-Simons gauge theory on a lattice | We propose a twisted supersymmetric (SUSY) invariant formulation of the Chern-Simons theory on a Euclidean three-dimensional lattice. The SUSY algebra to be realized on the lattice is the N ¼ 4 D ¼ 3 twisted algebra that was recently proposed by D'Adda et al. In order to keep the manifest anti-Her... | Twisted supersymmetry; Chern-Simons gauge theory | 2008-09 |
| 319 |
 |
Ailion, David Charles | Nuclear magnetic resonance in random fields: cluster formation and local dynamics of a deuteron glass | NMR data show that the deuteron "pseudo spin-glass" transition in Rbi- X(ND4)*D2P04 is not just a simple kinetic slowing down process but is characterized by a gradual condensation of randomly polarized clusters as expected if we deal with a percolation transition in eigenstate space. The results pr... | NMR; Nuclear magnetic resonance; Random fields; Spin lattice | 1986 |
| 320 |
 |
Gondolo, Paolo | Dark Stars: the first stars in the universe may be powered by dark matter healing | A new line of research on Dark Stars is reviewed, which suggests that the first stars to exist in the universe were powered by dark matter heating rather than by fusion. Weakly Interacting Massive Particles, which may be there own antipartmers, collect inside the first stars and annihilate to produc... | Dark stars; WIMP; Weakly interacting massive particles | 2009 |
| 321 |
 |
Williams, Clayton C. | Sub-10 nm lateral spatial resolution in scanning capacitance microscopy achieved with solid platinum probes | Sub-10 nm resolution can be obtained in scanning capacitance microscopy (SCM) if the probe tip is approximately of the same size. Such resolution is observed, although infrequently, with present commercially available probes. To acquire routine sub-10 nm resolution, a solid Pt metal probe has bee... | 2004 | |
| 322 |
 |
Mishchenko, Eugene | Gapless surfaces in anisotropic superfluids | We demonstrate when p-wave pairing occurs between species whose free Fermi surfaces are mismatched the gap generally vanishes over a two-dimensional surface. We present detailed calculations of condensation energy, superfluid density (Meissner mass) and specific heat for such states. We also consi... | Anisotropic superfluids; Meissner mass | 2006-11 |
| 323 |
 |
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 |
| 324 |
 |
Gondolo, Paolo | DUSEL theory white paper | The scientific case for a Deep Underground Science and Engineering Laboratory [DUSEL] located at the Homestake mine in Lead, South Dakota is exceptional. The site of this future laboratory already claims a discovery for the detection of solar neutrinos, leading to a Nobel Prize for Ray Davis. Moreov... | DUSEL; Deep Underground Science and Engineering Laboratory; Proton decay | 2008 |
| 325 |
 |
Vardeny, Zeev Valentine | Studies of Raman scattering in novel disubstituted acetylene polymers | We have studied resonant and non-resonant Raman scattering spectra in thin films of novel disubstituted acetylene polymers such as poly(l-ethyl-2-phenylacetylene) (PEtPA), poly(l-n-hexyl-2-phenylacetylene) (PHxPA) and poly(l-phenyl-2-/wibutylphenylacetylene) (PDPA-nBu), which possess high photolumin... | Raman scattering; Disubstituted acetylene polymers | 1997 |