Hello everyone, <div><br /></div><div>As part of an ongoing study, I am investigating how the electronic energy levels of the MgO(001) surface change when different Hubbard U corrections are applied to Mg and O orbitals (both occupied and unoccupied states).<br /><br />In CP2K (2024.3), when a U_eff value of 1.5 eV is applied to the Mg-3s and Mg-2s orbitals, the calculated:</div><div><br /></div><div>* HOMO (VBM) value, and<br />* HOMO–LUMO (band-gap) value</div><div><br />turn out to be identical.</div><div><br />However, performing similar calculations in Quantum ESPRESSO gives different values for the VBM and the band gap. I would like to understand whether this behavior arises from:<br />1. differences in the DFT+U implementations/projector definitions between CP2K and Quantum ESPRESSO, or<br />2. a possible issue in my CP2K setup or interpretation of the results.<br /><br />I have attached the corresponding CP2K input and output files.<br /><br />Any insights would be greatly appreciated.</div><div><br /></div><div>Sachin </div>
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