Hello CP2K community,<div><br /></div><div>I have recently switched from cp2k-2024.1 to cp2k-2025.1 and initially got some strange output. Running some test calculations using the same input with both versions, I found that the energy eigenvalues are shifted, and the HOMO - LUMO gap is much larger in 2025.1.</div><div><br /></div><div>- 2024.1:</div><div>*</div><div> -0.15118136 -0.15058927 -0.15030345 -0.14919531<br /> -0.14827092 -0.14449236 -0.14178774 -0.14087384<br /> -0.14005256<br /> Fermi Energy [eV] : -3.811024<br /> <br /> Lowest Eigenvalues of the unoccupied subspace spin 1<br /> -----------------------------------------------------<br /> OT| Eigensolver reached convergence in 763 iterations<br /> 0.19181627<br /> <br /> HOMO - LUMO gap [eV] : 9.030610<br /><br /> ENERGY| Total FORCE_EVAL ( QS ) energy [a.u.]: -1322.383368758011557</div><div>*</div><div><br /></div><div>- 2025.1:</div><div>*</div><div> -0.25036349 -0.25011266 -0.24923456 -0.24855820<br /> -0.24640841 -0.24154336 -0.23787275 -0.23769990<br /> -0.23629481<br /> Fermi Energy [eV] : -6.429909<br /> <br /> Lowest Eigenvalues of the unoccupied subspace spin 1<br /> -----------------------------------------------------<br /> OT| Eigensolver reached convergence in 887 iterations<br /> 0.25231706<br /> <br /> HOMO - LUMO gap [eV] : 13.295805<br /><br /> ENERGY| Total FORCE_EVAL ( QS ) energy [hartree] -1322.383368757196422</div><div>*</div><div><br /></div><div>Both calculations use PBE0 with ADMM pFIT3 and are started from a RESTART file from a PBE calculations, the system is amorphous Polyethylene. The 2024.1 HOMO-LUMO gap was pretty reasonable, the newer one is very high compared with experimental values and previously reported hybrid functional results. </div><div><br /></div><div>I didn't find anyone else experiencing this issue, does anyone have any idea what might be going on? </div><div><br /></div><div>Thank you,</div><div>Max</div><div><br /></div>
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