We review the general features of coherent multiple scattering of electromagnetic waves in random media. In particular, coherent backscattering and angular correlation functions of speckle patternsâ€¦ (More)

We consider the scattering theory for the SchrÃ¶dinger operator âˆ’Dx + V (x) on the graphs made of one-dimensional wires connected to external leads. We derive two expressions for the scattering matrixâ€¦ (More)

We study under which general conditions a pair of Dirac points in the electronic spectrum of a twodimensional crystal may merge into a single one. The merging signals a topological transition betweenâ€¦ (More)

Bloch oscillations are a powerful tool to investigate spectra with Dirac points. By varying band parameters, Dirac points can be manipulated and merged at a topological transition toward a gappedâ€¦ (More)

The low temperature magnetoconductance of a large array of quantum coherent loops exhibits Altshuler-Aronov-Spivak oscillations with a periodicity corresponding to 1/2 flux quantum per loop. We showâ€¦ (More)

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching andâ€¦ (More)

Although conservation of energy is fundamental in physics, its principles seem to be violated in the field of wave propagation in turbid media by the energy enhancement of the coherent backscatteringâ€¦ (More)

We study the orbital susceptibility of multiband systems with a pair of Dirac points interpolating between honeycomb and dice lattices. Despite having the same zero-field energy spectrum, theseâ€¦ (More)

We study the effect of the electron-electron interaction on the weak localization correction of a ring pierced by a magnetic flux. We compute exactly the path integral giving the magnetoconductivityâ€¦ (More)