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Now showing items 1-10 of 725

#### Mass, entropy, and holography in asymptotically de Sitter spaces

(American Physical Society, 2002-06-15)

We propose a novel prescription for computing the boundary stress tensor and charges of asymptotically de Sitter (dS) spacetimes from data at early or late time infinity. If there is a holographic dual to dS spaces, defined ...

#### Transmutation of the vicinal surface exponent due to gravity

(American Physical Society, 1988-04)

Near the edge of a facet, vicinal surfaces curve away from the plane with exponent (3/2. With gravity normal to the facet the exponent may change to 3. Generally, there will be a crossover from 3 to (3/2 as the facet edge ...

#### Photogeneration and recombination processes of neutral and charged excitations in films of a ladder-type poly(para-phenylene)

(American Physical Society, 1999-08-15)

We introduce a version of the cw photomodulation technique, measured far from the steady state, for obtaining the quantum efficiency, eta, of long-lived photoexcitations in pi-conjugated polymers. We apply this technique ...

#### Antiferromagnetic coupling of the single-molecule magnet Mn-12 to a ferromagnetic substrate

(American Physical Society, 2011-02-28)

We investigate magnetic coupling between a monolayer of prototype single-molecule magnets Mn-12 and a ferromagnetic Ni(111) substrate through S, using density-functional theory (DFT) and a DFT+U method. Our DFT and DFT+U ...

#### Extended and localized states in the periodic Anderson model

(American Physical Society, 1986-12)

The renormalized quasiparticle states are derived for a periodic Anderson model with a general hybridization matrix element between conduction electrons with two degrees of freedom and f electrons with N degrees of freedom. ...

#### Aging in coarsening diluted ferromagnets

(American Physical Society, 2010-10)

We comprehensively study nonequilibrium relaxation and aging processes in the two-dimensional randomsite Ising model through numerical simulations. We discuss the dynamical correlation length as well as scaling functions ...

#### Intervalenceband and plasmon optical absorption in heavily doped GaAs:C

(American Institute of Physics, 2002-01-01)

By using direct numerical-solution techniques for the reflectance (R) and transmittance (T) equations of a multilayer structure, we have analyzed infrared R and T measurements on heavily doped p-type GaAs:C films grown by ...

#### Electron-energy-loss and optical-transmittance investigation of Bi2Sr2CaCu2O8

(American Physical Society, 1990-07)

The energy-loss function Im(-1/ε) of Bi2Sr2CaCu2O8 has been measured over the range Eloss=0.8 to 80 eV by transmission electron-energy-loss spectroscopy (EELS) (nonimaging). The energy and momentum resolution were 0.1 eV ...

#### Robustness of Topologically Protected Surface States in Layering of Bi₂Te₃ Thin Films

(American Physical Society, 2010-10-27)

Bulk Bi<sub>2</sub>Te<sub>3</sub> is known to be a topological insulator. We investigate surface states of Bi<sub>2</sub>Te<sub>3</sub>(111) thin films of one to six quintuple layers using density-functional theory including ...

#### Chaotic advection, diffusion, and reactions in open flows

(AIP Publishing, 2000-03)

We review and generalize recent results on advection of particles in open time-periodic hydrodynamical flows. First, the problem of passive advection is considered, and its fractal and chaotic nature is pointed out. Next, ...