Atom-atom correlation in the presence of strong THz phonon excitation

Modifications in the short-range atom-atom probability distribution are examined when strong terahertz phonon excitation is present. A description is developed that includes the excited phonon mode amplitude explicitly and combines the contributions of all other modes into local residual variables, which allows for a clean separation of the non-local phononic part of the problem and the remaining local problem. The modification of the short range atomic correlation is computed through a solution of the Schrodinger equation for the residual local variables in the classically forbidden region.