Concept

Interaction de Yukawa

Publications associées (102)

Time evolution of correlations in strongly interacting fermions after a quantum quench

Using the adaptive time-dependent density-matrix renormalization group, we study the time evolution of density correlations of interacting spinless fermions on a one-dimensional lattice after a sudden change in the interaction strength. Over a broad range ...

2009

Preservation of heteronuclear multiple-quantum coherences in NMR by double-resonance irradiation

Geoffrey Bodenhausen, Mariachiara Verde, Simone Ulzega, Fabien Ferrage

A heteronuclear double-resonance (HDR) method based on MLEV-32 or WALTZ-32 pulse sequences has been designed for the investigation of relaxation of heteronuclear multiple-quantum (MQ) coherences. The theoretical analysis of this technique uses average Hami ...

2009

Electron localization by a donor in the vicinity of a basal stacking fault in GaN

Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Pierre Michel Corfdir, Jelena Ristic

We study the effects of the vicinity between a shallow donor nucleus and an I1-type basal stacking fault (BSF) in GaN. We propose a numerical calculation, in the “effective potential” formalism, of energies and envelope functions of electrons submitted to ...

2009

Magnetoresistive junctions based on epitaxial graphene and hexagonal boron nitride

Alfredo Pasquarello, Oleg Yazyev

We propose monolayer epitaxial graphene and hexagonal boron nitride (h-BN) as ultimate thickness covalent spacers for magnetoresistive junctions. Using a first-principles approach, we investigate the structural, magnetic, and spin transport properties of s ...

2009

Effect of Magnetic Field on Dynamics of Antiferromagnets

Martin Mourigal

Motivated by synthesis of new antiferromagnetic compounds with weak exchange coupling, a study of high magnetic field properties of the Heisenberg model on a square-lattice is undertaken here. Ordered spins at zero temperature cant toward the field directi ...

2008

Eikonal methods in AdS/CFT: BFKL Pomeron at weak coupling

We consider correlators of N = 4 super Yang Mills of the form A similar to , where the operators O-1 and O-2 are scalar primaries. In particular, we analyze this correlator in the planar limit and in a Lorentzian regime correspondi ...

Int School Advanced Studies2008

Percolative properties of hard oblate ellipsoids of revolution with a soft shell

Peter Ryser, Claudio Grimaldi, Niklaus Johner, Gianluca Ambrosetti

We present an in-depth analysis of the geometrical percolation behavior in the continuum of random assemblies of hard oblate ellipsoids of revolution. Simulations were carried out by considering a broad range of aspect-ratios, from spheres up to aspect-rat ...

2008

Coherence transfer between spy nuclei and nitrogen-14 in solids

Geoffrey Bodenhausen, Simone Cavadini

Coherence transfer from ‘spy nuclei’ such as 1H or 13C (S = 1/2) was used to excite single- or double-quantum coherences of 14N nuclei (I = 1) while the S spins were aligned along the static field, in the manner of heteronuclear single-quantum correlation ...

2008

Eikonal approximation in AdS/CFT: resumming the gravitational loop expansion

We derive an eikonal approximation to high energy interactions in Anti-de Sitter spacetime, by generalizing a position space derivation of the eikonal amplitude in flat space. We are able to resum, in terms of a generalized phase shift, ladder and cross la ...

Springer2007

Eikonal approximation in Ads/CFT: from shock waves to four-point functions

We initiate a program to generalize the standard eikonal approximation to compute amplitudes in Anti-de Sitter spacetimes. Inspired by the shock wave derivation of the eikonal amplitude in flat space, we study the two-point function epsilon similar to < O1 ...

Springer2007

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