<div dir="ltr">Hi<div><br></div><div>You can use the CHARGE keyword (<a href="https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT.html#CHARGE">https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT.html#CHARGE</a> ) to change the total number of electrons in your system. Whether the electrons will localise in the vacancy or delocalise over the whole cell is a different thing, which may depend on the functional you use.</div><div><br></div><div>SL</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 7 March 2017 at 12:33, 'Cristiana Passiu' via cp2k <span dir="ltr"><<a href="mailto:cp...@googlegroups.com" target="_blank">cp...@googlegroups.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi all,<div>I am a beginner user of CP2K and I would like to do a calculation comparing the energy of formation and the band gap of different types of oxygen vacancies in a ZrO2 crystal.</div><div>The oxygen vacancies differ in the number of electrons. For example, an F center has no charge, so it is obtained by simply removing an oxygen in the crystal. An F+ center is obtained by removing one oxygen and one electron; an F- center is obtained by adding one electron to the F center.<br></div><div>How can I model the situations where there are more or less electrons with respect to the neutral condition?</div><div><br></div><div>Many thanks,</div><div>Cristiana</div></div><span class="HOEnZb"><font color="#888888">
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