Hi,<div><br></div><div>I'm a user of CP2K/9.1. Currently I want to apply an electric field in the system to see its effect on the hyperfine interaction. And based on the results, I found the keyword EFIELD can produce the expected results. However, based on the cp2k manual description, EFIELD produces "<em>finite, time dependent, nonperiodic electric fields</em>". Since the "<a href="https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/EFIELD.html#list_ENVELOP">ENVELOP</a>" I used is CONSTANT, I think the electric field would be <em>a constant local field</em>. I'm wondering do I under this correctly? Then does this mean the EFIELD will act similarly to the keyword EXTERNAL_POTENTIAL (i.e., a static electric field applied on the simulation box)?</div><div>My simulation system is a bulk material rather than an isolated molecule or 2D slab, then could I still use EFIELD?</div><div>Could someone who have experience in this keyword provide some suggestion? Thanks in advance.</div><div><br></div><div>Best regards,</div><div>Hongyang</div><div><br></div>
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