## Search

Now showing items 201-220 of 227

#### The ground state of a quantum critical system

(arXiv, 2006)

The competition between the tendency of magnetic moments to order at low temperatures, and the tendency of conduction electrons to shield these moments, can result in a phase transition that takes place at zero Kelvin, the ...

#### Collective excitations in quantum Hall liquid crystals: Single-mode approximation calculations

(American Physical Society, 2006)

A variety of recent experiments probing the low-temperature transport properties of quantum Hall systems have suggested an interpretation in terms of liquid crystalline mesophases dubbed quantum Hall liquid crystals. The ...

#### The Origins Billions Star Survey: Galactic Explorer

(The Astronomical Society of the Pacific, 2006)

The Origins Billions Star Survey is a mission concept addressing the astrophysics of extrasolar planets, Galactic structure, the Galactic halo and tidal streams, the Local Group and local supercluster of galaxies, dark ...

#### Propagation of Light in the Field of Stationary and Radiative Gravitational Multipoles

(arXiv, 2006)

Extremely high precision of near-future radio/optical interferometric observatories like SKA, Gaia, SIM and the unparalleled sensitivity of LIGO/LISA gravitational-wave detectors demands more deep theoretical treatment of ...

#### Non-Fermi-liquid behavior in Ce(Ru1‑xFex)2Ge2 : Cause and effect

(American Physical Society, 2006)

We present inelastic neutron scattering measurements on the intermetallic compounds Ce(Ru1−xFex)2Ge2 (x=0.65, 0.76, and 0.87). These compounds represent samples in a magnetically ordered phase, at a quantum critical point, ...

#### The dynamics of superfluid 4He

(arXiv, 2006)

We present neutron scattering results for the dynamic response by superfluid and normal-fluid 4He and the results of a simple perturbation-theory analysis which allows us to describe all aspects of the observed behavior ...

#### Time-dependent density-functional theory beyond the adiabatic approximation: Insights from a two-electron model system

(American Institute of Physics, 2006)

Most applications of time-dependent density-functional theory (TDDFT) use the adiabatic local-density approximation (ALDA) for the dynamical exchange-correlation potential Vxc(r,t). An exact (i.e., nonadiabatic) extension ...

#### Coulomb corrections to the extrinsic spin-Hall effect of a two-dimensional electron gas

(American Physical Society, 2006)

We develop the microscopic theory of the extrinsic spin-Hall conductivity of a two- dimensional electron gas, including skew- scattering, side-jump, and Coulomb interaction effects. We find that while the spin-Hall ...

#### Exchange and correlation effects on the plasmon dispersions and the Coulomb drag in low-density electron bilayers

(arXiv, 2006)

We investigate the effect of exchange and correlation (xc) on the plasmon spectrum and the Coulomb drag between spatially separated low-density two-dimensional electron layers. We adopt a new approach, which employs dynamic ...

#### Integral charge quasiparticles in a fractional quantum Hall liquid

(American Physical Society, 2006)

Starting from a collective description of the incompressible fractional quantum Hall liquid as an elastic medium that supports gapped neutral excitations, I show that the one-electron spectral function of this system ...

#### Agarose-stabilized gold nanoparticles for surface-enhanced Raman spectroscopic detection of DNA nucleosides

(American Institute of Physics, 2006)

We present surface-enhanced Raman scattering (SERS) studies of DNA nucleosides using biologically benign agarose-stabilized gold nanoparticles (AAuNP). We compare the SERS activity of nucleosides with AAuNP to that of ...

#### Parametrized post-Newtonian theory of reference frames, multipolar expansions and equations of motion in the N-body problem

(arXiv, 2006)

We discuss a covariant generalization of the parametrized post-Newtonian (PPN) formalism in a class of scalar-tensor theories of gravity. It includes an exact construction of a set of global and local (Fermi-like) references ...

#### Fluctuating magnetic moments in liquid metals

(American Physical Society, 2006)

We reanalyze literature data on neutron scattering by liquid metals and show that there is an additional broad (in energy) quasielastic mode present that is absent in x-ray scattering. This mode cannot be accounted for by ...

#### Investigation of the presence of charge order in magnetite by measurement of the spin wave spectrum

(American Physical Society, 2006)

Inelastic neutron scattering results on magnetite (Fe3O4) show a large splitting in the acoustic spin wave branch, producing a 7 meV gap midway to the Brillouin zone boundary at q=(0,0,1∕2) and ℏω=43 meV. The splitting ...

#### Nanoscale Observation of Alkane Delayering

(arXiv, 2006)

Noncontact Atomic Force Microscopy and synchrotron x-ray scattering measurements on dotriacontane (n-C32H66 or C32) films adsorbed on SiO2-coated Si(100) wafers reveal a narrow temperature range near the bulk C32 melting ...

#### Analytic expression for the diamagnetic susceptibility of a uniform electron gas

(American Physical Society, 2006)

The diamagnetic (Landau) susceptibility is a key ingredient in current-density functional theory. We calculate this quantity of a uniform electron gas beyond the random-phase approximation and present an analytic expression ...

#### Influence of Quantum Size Effects on Island Coarsening

(American Physical Society, 2006)

Surface x-ray scattering and scanning-tunneling microscopy experiments reveal novel coarsening behavior of Pb nanocrystals grown on Si 111 - 7 7 . It is found that quantum size effects lead to the
breakdown of the ...

#### On the Speed of Gravity and Relativistic v/c Corrections to the Shapiro Time Delay

(arXiv, 2006)

Recent papers by Samuel [1,2] declared that the linearized post-Newtonian v/c effects are too small to have been measured in the recent experiment involving Jupiter and quasar J0842+1845 [3,4,5] that was used to measure ...

#### The effacing principle in the post-Newtonian celestial mechanics

(arXiv, 2006)

First post-Newtonian (PN) approximation of the scalar-tensor theory of gravity is used to discuss the effacing principle in N-body system, that is dependence of equations of motion of spherically-symmetric bodies comprising ...

#### Aberration and the Fundamental Speed of Gravity in the Jovian Deflection Experiment

(ar, 2006)

We describe our explicit Lorentz-invariant solution of the Einstein and null geodesic equations for the deflection experiment of 2002 September 8 when a massive moving body, Jupiter, passed within 3.7' of a line-of- sight ...