Concept

Order and disorder

Publications associées (302)

Coherence properties of exciton polariton OPO condensates in one and two dimensions

We give an overview of the coherence properties of exciton-polariton condensates generated by optical parametric scattering. Different aspects of the first-order coherence (g((1))) have been investigated. The spatial coherence extension of a two-dimensiona ...

Iop Publishing Ltd2012

On Accelerating Interpolants

Viktor Kuncak, Hossein Hojjat

We present Counterexample-Guided Accelerated Abstraction Refinement (CEGAAR), a new algorithm for verifying infinite-state transition systems. CEGAAR combines interpolation-based predicate discovery in counterexample guided predicate abstraction with accel ...

2012

Accelerating Interpolants

Viktor Kuncak, Hossein Hojjat

2012

First-order coil-globule transition driven by vibrational entropy

Paolo De Los Rios, Francesco Piazza, Carlo Maffi

By shifting the balance between conformational entropy and internal energy, polymers modify their shape under external stimuli, such as changes in temperature. Prominent among such transformations is the coil-globule transition, whereby a polymer can switc ...

Nature Publishing Group2012

Liquid-Quench Sampling System for the Analysis of Gas Streams from Biomass Gasification Processes. Part 1: Sampling Noncondensable Compounds

Christian Ludwig, Tilman J. Schildhauer

In biomass gasification plants and related research units, on-line analysis of noncondensable compounds (H-2, CO, CO2, CH4, and light hydrocarbons) and condensable compounds (water, tars, etc.) is desired. Long-duration on-line measurements are often a cha ...

Amer Chemical Soc2012

Elastic, dielectric, and piezoelectric anomalies and Raman spectroscopy of 0.5Ba(Ti0.8Zr0.2)O3-0.5(Ba0.7Ca0.3)TiO3

Dragan Damjanovic, Alberto Biancoli, Leili Batooli, Amirhossein Vahabzadeh

The solid solution 0.5Ba(Ti0.8Zr0.2)O-3-0.5(Ba0.7Ca0.3)TiO3 (BCZT) is a promising lead-free piezoelectric material with exceptionally high piezoelectric coefficients. The strong response is related to structural instabilities close to ambient temperature. ...

American Institute of Physics2012

Effect of Charge Order on the Plasmon Dispersion in Transition-Metal Dichalcogenides

Helmuth Berger

We investigate the dispersion of the charge carrier plasmon in the three prototypical charge-density wave bearing transition-metal dichalcogenides 2H-TaSe2, 2H-TaS2, and 2H-NbSe2 employing electron energy-loss spectroscopy. For all three compounds the plas ...

2011

Phase stability, point defects, and elastic properties of W-V and W-Ta alloys

Nadine Baluc

The structure and phase stability of binary tungsten-vanadium and tungsten-tantalum alloys are investigated over a broad range of alloy compositions using ab initio and cluster expansion methods. The alloys are characterized by the negative enthalpy of mix ...

2011

Critical spin dynamics of the S=1/2 spin chain compound CuSe2O5

Helmuth Berger

Phonon frequency and linewidth as well as quasielastic scattering due to spin energy fluctuations are used to evaluate the evolution of spin correlations in a spin chain system with considerable interchain coupling. In the compound CuSe2O5 these interactio ...

2011

Graph Theory Meets Ab Initio Molecular Dynamics: Atomic Structures and Transformations at the Nanoscale

Wanda Andreoni, Fabio Pietrucci

Social permutation invariant coordinates are introduced describing the bond network around a given atom. They originate from the largest eigenvalue and the corresponding eigenvector of the contact matrix, are invariant under permutation of identical atoms, ...

2011

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