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Creator | Title | Description | Subject | Date |
251 |
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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 |
252 |
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Mattis, Daniel C. | Extinction of antiferromagnetism by holes in CuO2 | The introduction of a sufficient number of holes into antiferromagnetic planes of Cu02 in La-Cu-O and Y-Ba-Cu-O causes antiferromagnetism to disappear at a critical density xc, beyond which superconductivity occurs. We investigate two competing tendencies, which determine the dependence of xc on the... | Antiferromagnets | 1991-08 |
253 |
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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 |
254 |
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Boehme, Christoph | Fast nuclear spin hyperpolarization of phosphorus in silicon | We experimentally demonstrate a method for obtaining nuclear spin hyperpolarization, that is, polarization significantly in excess of that expected at thermal equilibrium. By exploiting a nonequilibrium Overhauser process, driven by white light irradiation, we obtain more than 68% negative nuclear p... | Hyperpolarization; Spin coherence; Electrical readout | 2009-01 |
255 |
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Wu, Yong-Shi | Fast tracking detector with fiber scintillators and a position sensitive photomultiplier | We have studied the properties of a tracking detector composed of 32 fiber scintillators coupled to a multianode photo-multiplier placed in a pion beam at TRIUMF. We measured the efficiency of the detector, as well as its tracking capabilities and double hit resolution. | Fast tracking detector; Fiber scintillators; Position sensitive photomultiplier | 1989-02 |
256 |
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Vardeny, Zeev Valentine; Symko, Orest George | Femtosecond dynamics of quasi-particles in YBa2Cu3O7-δ superconductor films | We have studied the transient electronic response of YBa2Cu307-δ epitaxialy grown H T c superconductor thin films in the femtosecond time domain, using transient photoinduced reflectivity (AR) with 60 fsec time resolution. For temperatures T>Tc only a bolometric signal was observed with ARrO. For ... | Femtosecond dynamics; YBa2Cu3O7-8; Transient electronic response; Transient optical response | 1991-03 |
257 |
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Symko, Orest George; Vardeny, Zeev Valentine | Femtosecond dynamics of quasi-particles in YBa2Cu3O7-δ superconductor films | We have studied the transient electronic response of YBa2Cu30y . 5 epitaxialy grown HTC superconductor thin films in the femtosecond time domain, using transient photoinduced reflectivity (∆R) with 60 fsec time resolution. For temperatures T>TC only a bolometric signal was observed with ∆R>0. F... | Femtosecond dynamics; Superconductor films; YBCO films | 1991-03 |
258 |
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Vardeny, Zeev Valentine | Femtosecond dynamics of the nonlinear optical response in polydiethynylsilane | We have measured the femtosecond dynamics of the nonlinear optical response xc3' in polydiethynylsilane ( C4H2SiBu2)x, a novel class of r-conjugated polymers incorporating Si, using degenerate four-wave mixing and photoinduced absorption techniques. In resonance conditions at 620 nm we found x (3) ... | Polydiethynylsilane; Femtosecond dynamics; Nonlinear optical response; Pi-conjugated polymers | 1991 |
259 |
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Vardeny, Zeev Valentine; Symko, Orest George | Femtosecond optical detection of quasiparticle dynamics in High-Tc YBa2Cu3O7-δ superconducting thin films | Femtosecond dynamics of photogenerated quasiparticles in YBa2Cu307-δ superconducting thin films shows at r < Tc two main electronic processes: (i) quasiparticle avalanche production during hot-carrier thermalization, which takes about 300 fsec; (ii) recombination of quasiparticles to form Cooper pa... | Femtosecond optical detection; HTc YBa2Cu3O7-8 | 1990-11 |
260 |
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Symko, Orest George; Vardeny, Zeev Valentine | Femtosecond optical detection of quasiparticle dynamics in high-Tc YBa2Cu3O7- 8 superconducting thin films | Femtosecond dynamics of photogenerated quasiparticles in YBa2Cu307-δ superconducting thin films shows at T ≤ Tc two main electronic processes: (i) quasiparticle avalanche production during hot-carrier thermalization, which takes about 300 fsec; (ii) recombination of quasiparticles to form Cooper ... | Quasiparticle dynamics; High-Tc; Femtosecond dynamics; Photogenerated quasiparticles | 1990-11 |
261 |
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Mattis, Daniel C. | Ferromagnetism and spin waves in the band theory | Intra-atomic exchange (Hund's rule mechanism) and Heisenberg nearest-neighbor exchange are examined for their role in the ferromagnetism of metals with degenerate bands. We examine the ground state, and find there is ferromagnetism once the largest eigenvalue j00 of the exchange matrix exceeds 1/2... | Band theory; Hund's rule | 1963-12 |
262 |
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Mattis, Daniel C. | Few-body problem on a lattice | The author explores some of the inherent simplifications of "quantum lattice physics." He distinguishes between fermions and bosons and analyzes the n-body problem for each, with n = 1,2,3... typically a small number. With delta-function (zero-range) interactions, the three-body problem on a lattice... | Quantum; Electrons; Spin | 1986 |
263 |
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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 |
264 |
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DeTar, Carleton | Finite temperature QCD: progress and outstanding problems | I review recent progress in numerical simulations of finite temperature quantum chromodynamics and discuss the status of some outstanding problems. Included is (1) a discussion of recent results determining the temperature of the "phase transition" in full QCD, (2) a scaling analysis of the Polyakov... | Phase transitions; Staggered fermions; Wilson fermions; Polyakov loop; Deconfinement; Instanton | 1995-04 |
265 |
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DeTar, Carleton | Finite temperature lattice QCD with clover fermions | We report on our simulation of finite temperature lattice QCD with two flavors of O(a) Symanzik-improved fermions and O(a2) Symanzik-improved glue. Our thermodynamic simulations were performed on an 83 × 4 lattice, and we have performed complementary zero temperature simulations on an 83 × 16 la... | Wilson quarks; Clover fermions | 1997-02 |
266 |
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DeTar, Carleton | Finite-size and quark mass effects on the QCD spectrum with two flavors | We have carried out spectrum calculations with two flavors of dynamical Kogut-Susskind quarks on four lattice sizes from 83X24 to 163 X 24 at couplings that correspond to chiral symmetry restoration for a lattice with six time slices. We estimate that the linear spatial sizes of the lattices range f... | Kogut-Susskind quarks; Hadron mass; Pion mass | 1993-11 |
267 |
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DeTar, Carleton | First determination of the strange and light quark masses from full lattice QCD | We compute the strange quark mass ms and the average of the u and d quark masses mˆ using full lattice QCD with three dynamical quarks combined with the experimental values for the rr and K masses. The simulations have degenerate u and d quarks with masses mu=md=mˆ αs low as ms/8, and two diffe... | Staggered quarks; Quark-gluon plasma | 2004-08 |
268 |
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Sokolsky, Pierre | First observation of the Greisen-Zatsepin-Kuzmin suppression | The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard deviations. HiRes' measurement of the flux of ultrahigh energy cosmic rays shows a sharp suppression at an energy of 6 x 10^1... | Extensive air showers; Suppression; Energy spectrum; Fluorescence; GZK cutoff | 2008-03 |
269 |
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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 |
270 |
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Ailion, David Charles | Floating of the modulation wave and phase pinning in incommensurate Rb2ZnBr4 | Nuclear-magnetic-resonance measurements in incommensurate Rb2ZnBr4 show the existence of regions where the modulation wave is floating. The floating regions coexist with other regions where the modulation wave is static. Impurity phase pinning and a roughening of the modulation wave at higher temper... | Floating; Incommensurate phase; Phason mode; Lattices | 1983 |
271 |
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Mishchenko, Eugene | Fluctuations of radiation from a chaotic laser below threshold | Radiation from a chaotic cavity filled with gain medium is considered. A set of coupled equations describing the photon density and the population of gain medium is proposed and solved. The spectral distribution and fluctuations of the radiation are found. The full noise is a result of a competitio... | Chaotic laser | 2004-03 |
272 |
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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 |
273 |
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Gerton, Jordan | Fluorescence near-field microscopy of DNA at Sub-10A nm resolution | We demonstrate apertureless near-field microscopy of single molecules at sub-10 nm resolution. With a novel phase filter, near-field images of single organic fluorophores were obtained with ~sixfold improvement in the signal-to-noise ratio. The improvement allowed pairs of molecules separated by ~... | | 2006-12 |
274 |
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Symko, Orest George | Formation of AlCuFe quasicrystalline thin films by solid state diffusion | We show that thin films 3000 A in thickness of the icosahedral AlCuFe phase can be formed by solid state diffusion of sputtered Al, Cu, and Fe layers. As for bulk materials, we propose that the icosahedral phase grows by diffusion of the 0.1 in the A13Fe layer previously formed by interdiffusion of... | AlCuFe; Quasicrystalline thin films; Solid state diffusion; Icosahedral phase | 1994 |
275 |
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Wu, Yong-Shi | Fractional statistics and fractional quantized Hall effect | We suggest that the origin of the odd-denominator rule observed in the fractional quantized Hall effect (FQHE) may lie in fractional statistics which govern quasiparticles in FQHE. A theorem concerning statistics of clusters of quasiparticles implies that fractional statistics do not allow coexist... | Fractional statistics; Quasielectrons; Quasiholes | 1985-05 |