Now showing items 1-20 of 1773

• #### The 0-brane Action in a General D = 4 Supergravity Background ﻿

(Institute of Physics Publishing, 1999)
We begin by presenting the superparticle action in the background of N=2, D=4 supergravity coupled to n vector multiplets interacting via an arbitrary special Kahler geometry. Our construction is based on implementing ...
• #### 3 W Continuous-Wave Room Temperature Single-Facet Emission From Quantum Cascade Lasers Based On Nonresonant Extraction Design Approach ﻿

(American Institute of Physics, 2009)
A strain-balanced, InP-based quantum cascade laser structure, designed for light emission at 4.6 $\mu$m using a new nonresonant extraction design approach, was grown by molecular beam epitaxy. Removal of the restrictive ...
• #### 3D Multicolor Super-Resolution Imaging Offers Improved Accuracy in Neuron Tracing ﻿

(Public Library of Science, 2012)
The connectivity among neurons holds the key to understanding brain function. Mapping neural connectivity in brain circuits requires imaging techniques with high spatial resolution to facilitate neuron tracing and high ...
• #### A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk ﻿

(Springer Nature, 1999)
The accurate measurement of extragalactic distances is a central challenge of modern astronomy, being required for any realistic description of the age, geometry and fate of the Universe. The measurement of relative ...
• #### Ab initiotight-binding Hamiltonian for transition metal dichalcogenides ﻿

(American Physical Society (APS), 2015)
We present an accurate ab initio tight-binding Hamiltonian for the transition metal dichalcogenides, MoS2, MoSe2, WS2, WSe2, with a minimal basis (the d orbitals for the metal atoms and p orbitals for the chalcogen atoms) ...
• #### Absence of Anomalous Copper Vibrations in YBa2 Cu3O7−δ ﻿

(American Physical Society (APS), 1994)
We find a normal temperature dependence for the Doppler broadening of the 230-eV resonance in the neutron cross section of Cu65 atoms in YBa2Cu3O7 between 10 and 300 K. No abrupt changes in the copper momentum spectrum ...
• #### Absence of discontinuities in ion-channeling parameters for YBa2 Cu3O7−δ thin films ﻿

(American Physical Society (APS), 1997)
We have measured the ion-channeling minimum yield (χmin) and angular width (Ψ1/2) for Y, Ba, Cu, and O in 2000 Å (001)-oriented films of YBa2Cu3O7−δ on MgO. The measurements mapped out a 30 K region around the critical ...
• #### Absence of Disorder-Driven Metal-Insulator Transitions in Simple Holographic Models ﻿

(American Physical Society (APS), 2015)
We study electrical transport in a strongly coupled strange metal in two spatial dimensions at finite temperature and charge density, holographically dual to the Einstein-Maxwell theory in an asymptotically four-dimensional ...
• #### Absence of red structural color in photonic glasses, bird feathers, and certain beetles ﻿

(American Physical Society (APS), 2014)
Colloidal glasses, bird feathers, and beetle scales can all show structural colors arising from short-ranged spatial correlations between scattering centers. Unlike the structural colors arising from Bragg diffraction in ...
• #### Accelerations of Water Masers in NGC 4258 ﻿

(IOP Publishing, 2000)
The water masers in NGC4258 delineate the structure and dynamics of a sub-parsec-diameter accretion disk around a supermassive black hole. VLBA observations provide precise information about the positions in the plane of ...
• #### Accounting for inhomogeneous broadening in nano-optics by electromagnetic modeling based on Monte Carlo methods ﻿

(Proceedings of the National Academy of Sciences, 2014)
Many experimental systems consist of large ensembles of uncoupled or weakly interacting elements operating as a single whole; this is particularly the case for applications in nano-optics and plasmonics, including colloidal ...
• #### Acoustic buffeting by infrasound in a low vibration facility ﻿

(AIP Publishing, 2016)
Measurement instruments and fabrication tools with spatial resolution on the atomic scale require facilities that mitigate the impact of vibration sources in the environment. One approach to protection from vibration in a ...
• #### Activation energy study of electron transport in high performance short wavelengths quantum cascade lasers ﻿

(The Optical Society, 2010)
We present a method to study current paths through quantum cascade lasers (QCLs). The temperature dependence of the current is measured at a fixed voltage. At low temperatures we find activation energies that correspond ...
• #### Active to Sterile Neutrino Mixing Limits from Neutral-Current Interactions in MINOS ﻿

(American Physical Society (APS), 2011)
Results are reported from a search for active to sterile neutrino oscillations in the MINOS long-baseline experiment, based on the observation of neutral-current neutrino interactions, from an exposure to the NuMI neutrino ...
• #### Adaptive Remodelling by FliN in the Bacterial Rotary Motor ﻿

(Elsevier BV, 2014)
Sensory adaptation in the Escherichia coli chemosensory pathway has been the subject of interest for decades, with investigation focusing on the receptors that process extracellular inputs. Recent studies demonstrate that ...
• #### Adatom registry on Si(111)-(√3 × √3 )R30°-B ﻿

(American Physical Society (APS), 1990)
We have used tunneling microscopy to determine the binding site of adatoms on Si(111)-(√3 × √3 )R30° stabilized by surface boron doping. The adatoms are found to occupy the T4 binding site, regardless of either the local ...
• #### Adiabatic Preparation of Many-Body States in Optical Lattices ﻿

(American Physical Society, 2010)
We analyze a technique for the preparation of low-entropy many-body states of atoms in optical lattices based on adiabatic passage. In particular, we show that this method allows preparation of strongly correlated states ...
• #### Adiabatic Quantum Simulation of Quantum Chemistry ﻿

(Nature Publishing Group, 2014)
We show how to apply the quantum adiabatic algorithm directly to the quantum computation of molecular properties. We describe a procedure to map electronic structure Hamiltonians to 2-body qubit Hamiltonians with a small ...
• #### The AdS/QCD correspondence: still undelivered ﻿

(Springer Science + Business Media, 2009)
We consider the particle spectrum and event shapes in large N gauge theories in different regimes of the short-distance ’t Hooft coupling, λ. The mesons in the small λ limit should have a Regge spectrum in order to agree ...
• #### Advanced cold molecule electron EDM ﻿

(EDP Sciences, 2013)
Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |de| < 1.05×10−27 e · cm would be an indication of physics beyond the Standard Model. The ...