Anisotropy and interference in wave transport: an analytic theory

A theory is presented which incorporates the effect of dielectric anisotropy in random multiple scattering media. It predicts anisotropic diffusion, and a deflection of the diffuse energy flow in anisotropic slabs in the direction parallel to the slab. The transmittance integrated over all incoming and outgoing directions scales with the transport mean free path along the surface normal. The escape function in anisotropic dielectrics is no longer bell shaped. In this model anisotropy facilitates Anderson localization.     

Spatial quantum correlations in multiple scattered light

We predict a new spatial quantum correlation in light propagating through a multiple scattering random medium. The correlation depends on the quantum state of the light illuminating the medium, is infinite in range, and dominates over classical mesoscopic intensity correlations. The spatial quantum correlation is revealed in the quantum fluctuations of the total transmission or reflection through the sample and should be readily observable experimentally.     

Roton softening in the solid hydrogens

We present a theory of the roton excitations in high-density J = 0 solid hydrogen. We have calculated dispersion relations and density of states as a function of the density of the solids for both hcp and fcc structures. Increasing the density of the rotationally symmetric fcc solid leads to roton softening. When the X₅ roton energy becomes imaginary symmetry breaking of the ground state occurs, resulting in an orientationally ordered solid.