Publications (16)
Ultracold Fermions in a Graphene-Type Optical Lattice
Kean Loon Lee, Benoit Gremaud, Rui Han +2
Some important features of the graphene physics can be reproduced by loading ultracold fermionic atoms in a two-dimensional optical lattice with honeycomb symmetry and we address h…
Nonlinear coherent transport of waves in disordered media
Thomas Wellens, Benoit Gremaud
We present a diagrammatic theory for coherent backscattering from disordered dilute media in the nonlinear regime. The approach is non-perturbative in the strength of the nonlinear…
Coherent propagation of waves in random media with weak nonlinearity
Thomas Wellens, Benoit Gremaud
We develop a diagrammatic theory for transport of waves in disordered media with weak nonlinearity. We first represent the solution of the nonlinear wave equation as a nonlinear Bo…
Enhancement of radiation trapping for quasi-resonant scatterers at low temperature
Romain Pierrat, Benoit Gremaud, Dominique Delande
We present a transport equation for the incoherent propagation of radiation inside a quasi-resonant atomic gas at low temperature. The derivation is based on a generalized Bethe-Sa…
Momentum-space signatures of the Anderson transition in a symplectic, two-dimensional, disordered ultracold gas
Ehsan Arabahmadi, Daniel Schumayer, Benoit Gremaud +2
We study Anderson Localization in two dimensional (2D) disordered spin-orbit systems described by the Gaussian symplectic ensemble using momentum-space signatures such as the coher…
Topological quantum phase transitions of attractive spinless fermions in a honeycomb lattice
Dario Poletti, Christian Miniatura, Benoit Gremaud
We investigate a spinless Fermi gas trapped in a honeycomb optical lattice with attractive nearest-neighbor interactions. At zero temperature, mean-field theory predicts three quan…
Coherent Backscattering of Light with Nonlinear Atomic Scatterers
Thomas Wellens, Benoit Gremaud, Dominique Delande +1
We study coherent backscattering of a monochromatic laser by a dilute gas of cold two-level atoms in the weakly nonlinear regime. The nonlinear response of the atoms results in a m…
Photo-ionization of the helium atom close to the double ionization threshold: towards the Ericson regime
Benoit Gremaud, Dominique Delande
We calculate the photo-ionization cross-section from the ground state of the helium atom, using the complex rotation method and diagonalization of sparse matrices. This produces di…
Speckle instability: coherent effects in nonlinear disordered media
Benoit Gremaud, Thomas Wellens
We numerically investigate the properties of speckle patterns formed by nonlinear point scatterers. We show that, in the weak localization regime, dynamical instability appears, ev…
Bloch oscillations of ultracold atoms: a tool for a metrological determination of
Remy Battesti, Pierre Clade, Saida Guellati-Khelifa +5
We use Bloch oscillations in a horizontal moving standing wave to transfer a large number of photon recoils to atoms with a high efficiency (99.5% per cycle). By measuring the phot…
Magnetoelastic interaction in the two-dimensional magnetic material MnPS studied by first principles calculations and Raman experiments
Diana Vaclavkova, Alex Delhomme, Clément Faugeras +7
We report experimental and theoretical studies on the magnetoelastic interactions in MnPS. Raman scattering response measured as a function of temperature shows a blue shift of…
The superfluid fountain effect in a Bose-Einstein condensate
Tomasz Karpiuk, Benoit Gremaud, Christian Miniatura +1
We consider a simple experimental setup, based on a harmonic confinement, where a Bose-Einstein condensate and a thermal cloud of weakly interacting alkali atoms are trapped in two…
Ghost orbits in the diamagnetic hydrogen spectrum using harmonic inversion
Benoit Gremaud, Dominique Delande
The harmonic inversion method is applied in the case of the hydrogen atom in a magnetic field to extract classical information from the quantum photo-ionization cross-section. The…
Quantum Expression of Classical Chaos
Sudhir R. Jain, Benoit Gremaud, Avinash Khare
Even as we understand for long that the world is quantal and buried in it is classical dynamics which is chaotic, finding eigenfunctions analytically from the the Schroedinger equa…
Emergent Spin Liquids in the Hubbard Model on the Anisotropic Honeycomb Lattice
Guangquan Wang, Mark O. Goerbig, Christian Miniatura +1
We study the repulsive Hubbard model on an anisotropic honeycomb lattice within a mean-field and a slave-rotor treatment. In addition to the known semi-metallic and band-insulating…
corrections in semi-classical formula for smooth chaotic dynamics
Benoit Gremaud
The validity of semiclassical expansions in the power of for the quantum Green's function have been extensively tested for billiards systems, but in the case of chaotic dyn…