What is Quantum Espresso (QE)? QE is an integrated suite of Open-Source computer codes for electronic-structure calculations and materials modeling at the nanoscale. It is based on density-functional theory, plane waves, and pseudopotentials. FYI, ESPRESSO is an acronym for opEn-Source Package for Research in Electronic Structure, Simulation, and Optimization. For more information, you can check its official site here https://www.quantum-espresso.org/ Quantum...