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15 papers · 2 filters
Observation of Superfluidity of Polaritons in Semiconductor Microcavities
A. Amo, J. Lefrere, S. Pigeon +6
One of the most striking manifestations of quantum coherence in interacting boson systems is superfluidity. Exciton-polaritons in semiconductor microcavities are two-dimensional co…
Adiabatic-connection fluctuation-dissipation density-functional theory based on range separation
Julien Toulouse, Iann C. Gerber, Georg Jansen +2
An adiabatic-connection fluctuation-dissipation theorem approach based on a range separation of electron-electron interactions is proposed. It involves a rigorous combination of sh…
Intermediate range chemical ordering of cations in simple molten alkali halides
M. Salanne, C. Simon, P. Turq +1
The presence of first sharp diffraction peaks in the partial structure factors is investigated in computer simulations of molten mixtures of alkali halides. An intermediate range o…
Imaging the antiparallel magnetic alignment of adjacent Fe and MnAs thin films
R. Breitwieser, M. Marangolo, J. Luning +5
The magnetic coupling between iron and alpha - MnAs in the epitaxial system Fe/MnAs/GaAs(001) has been studied at the sub-micron scale, using element selective x-ray photoemission…
Impact of the electron-electron correlation on phonon dispersions: failure of LDA and GGA functionals in graphene and graphite
Michele Lazzeri, Claudio Attaccalite, Ludger Wirtz +1
We compute electron-phonon coupling (EPC) of selected phonon modes in graphene and graphite using various ab-initio methods. The inclusion of non-local exchange-correlation effects…
Structure, Stability, Edge States and Aromaticity of Graphene Ribbons
Tobias Wassmann, Ari P. Seitsonen, A. Marco Saitta +2
We determine the stability, the geometry, the electronic and magnetic structure of hydrogen-terminated graphene-nanoribbons edges as a function of the hydrogen content of the envir…