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Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
P. Giannozzi, S. Baroni, N. Bonini +30
Quantum ESPRESSO is an integrated suite of computer codes for electronic-structure calculations and materials modeling, based on density-functional theory, plane waves, and pseudop…
First principles calculations of X-ray absorption in an ultrasoft pseudopotentials scheme: from -quartz to high-T compounds
Christos Gougoussis, Matteo Calandra, Ari P. Seitsonen +1
We develop a first-principles scheme based on the continued fraction approach an d ultrasoft pseudopotentials to calculate K-edge X-ray absorption spectra in solids. The method all…
Structure, Stability, Edge States and Aromaticity of Graphene Ribbons
Tobias Wassmann, Ari P. Seitsonen, A. Marco Saitta +2
We determine the stability, the geometry, the electronic and magnetic structure of hydrogen-terminated graphene-nanoribbons edges as a function of the hydrogen content of the envir…
Measuring the intrinsic charge transfer gap using K-edge X-ray absorption spectroscopy
C. Gougoussis, M. Calandra, A. Seitsonen +3
Pre-edge features in X-ray absorption spectroscopy contain key information about the lowest excited states and thus on the most interesting physical properties of the system. In tr…