QMMMW: A wrapper for QM/MM simulations with Quantum ESPRESSO and LAMMPS

We present QMMMW, a new program aimed at performing Quantum Mechanics/Molecular Mechanics (QM/MM) molecular dynamics. The package operates as a wrapper that patches PWscf code included in theQuantumESPRESSO distribution and LAMMPSMolecular Dynamics Simulator. It is designed with a paradigm based on three guidelines: (i) minimal amount of modifications on the parent codes, (ii) flexibility and computational efficiency of the communication layer and (iii) accuracy of the Hamiltonian describing the interaction between the QM and MM subsystems. These three features are seldom present simultaneously in other implementations of QMMM. The QMMMWproject is hosted by qe-forge at (http://qe-forge.org/gf/project/qmmmw/).