Showing results 81 to 91 of 91
 Long-range Coulomb interaction in ZrO2; Ghosez, Philippe  ; in Physical Review Letters (1998), 81(15), 3297-3297 Detailed reference viewed: 5 (0 ULg)Theoretical Study of the 4f146s2S1/2 - 4f136s22F°7/2E3 transition in Yb IIBiémont, Emile ; Quinet, Pascal in Physical Review Letters (1998), 81 Detailed reference viewed: 11 (0 ULg)Polarization dependence of the exchange energy; Ghosez, Philippe ; in Physical Review Letters (1997), 78(10), 2029-2029 Detailed reference viewed: 1 (0 ULg)Density-functional theory of polar insulators; Ghosez, Philippe ; in Physical Review Letters (1997), 78(2), 294-297 We examine the density-functional theory of macroscopic insulators, obtained in the large-cluster limit or under periodic boundary conditions. For polar crystals, we find that the two procedures are not ... [more ▼] We examine the density-functional theory of macroscopic insulators, obtained in the large-cluster limit or under periodic boundary conditions. For polar crystals, we find that the two procedures are not equivalent. In a large-cluster case, the exact exchange-correlation potential acquires a homogeneous ''electric field'' which is absent from the usual local approximations, and the Kohn-Sham electronic system becomes metallic. With periodic boundary conditions, such a field ist forbidden, and the polarization deduced from Kohn-Sham wave functions is incorrect even if the exact functional is used. [less ▲] Detailed reference viewed: 3 (0 ULg)Inner patterns and front propagation of dynamic random impurity modelVandewalle, Nicolas ; Ausloos, Marcel in Physical Review Letters (1996), 77(3), 510-513 We investigate a simple model, the so-called dynamic epidemic model, for the evolution of an advancing interface through a medium containing mobile impurities. A short range repulsion between the front ... [more ▼] We investigate a simple model, the so-called dynamic epidemic model, for the evolution of an advancing interface through a medium containing mobile impurities. A short range repulsion between the front and the impurities leads to an aggregation process along the front, and to the trapping of aggregates. The amplitude of this self-organization for collective impurity trapping is analyzed in two dimensions. A relationship exists between individual motion and the aggregation of particles. The results indicate that self-organizing features are different behind and on the front. [less ▲] Detailed reference viewed: 3 (0 ULg)DENSITY-POLARIZATION FUNCTIONAL THEORY OF THE RESPONSE OF A PERIODIC INSULATING SOLID TO AN ELECTRIC-FIELD; Ghosez, Philippe ; in Physical Review Letters (1995), 74(20), 4035-4038 Detailed reference viewed: 5 (0 ULg) Conformal invariance and degrees of freedom in the QCD string; Cudell, Jean-René in Physical Review Letters (1994), 72 Detailed reference viewed: 6 (1 ULg)Are there oscillations in the baryon / meson ratio?Cudell, Jean-René ; in Physical Review Letters (1992), 69 Detailed reference viewed: 3 (2 ULg)ANOMALOUS ELECTRON HEAT-TRANSPORT DRIVEN BY LOW-FREQUENCY ELECTROMAGNETIC TURBULENCE - REPLYThoul, Anne ; ; in Physical Review Letters (1988), 60(10), 967-967 Detailed reference viewed: 3 (0 ULg)ANOMALOUS ELECTRON HEAT-TRANSPORT DRIVEN BY LOW-FREQUENCY ELECTROMAGNETIC TURBULENCEThoul, Anne ; ; in Physical Review Letters (1987), 59(13), 1448-1451 Nucleon-Nucleus Potential at Low and Intermediate Energy in a Dirac-Hartree ModelJaminon, Martine ; Mahaux, Claude ; Rochus, Pierre in Physical Review Letters (1979), 43 We calculate the average nucleon-nucleus potential from the Dirac-Hartree model, extended to positive energy. The sole input is a one-boson-exchange nucleon-nucleon interaction which reproduces ground ... [more ▼] We calculate the average nucleon-nucleus potential from the Dirac-Hartree model, extended to positive energy. The sole input is a one-boson-exchange nucleon-nucleon interaction which reproduces ground-state properties. We obtain fair agreement with empirical values. Between 170 and 400 MeV, the calculated potential is repulsive in the nuclear interior but still attractive at the surface. This shape is related to the scalar and vector nature of the exchanged bosons. [less ▲] Detailed reference viewed: 21 (4 ULg) |
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