<p>Dear CP2K developers and users,</p><p>I am studying a two-dimensional system consisting of a slab with an adsorbed molecule. For this reason, I would like to use two-dimensional periodic boundary conditions in the (xy) plane together with the WAVELET Poisson solver.</p><p>The relevant sections of my input file are:</p><span dir="ltr"><span dir="ltr">&POISSON
  PERIODIC XY </span></span><div><span dir="ltr"><span dir="ltr">  POISSON_SOLVER WAVELET </span></span></div><div><span dir="ltr"><span dir="ltr">&END POISSON</span></span><p>and</p><span dir="ltr"><span dir="ltr">&SUBSYS </span></span></div><div><span dir="ltr"><span dir="ltr"> &CELL </span></span></div><div><span dir="ltr"><span dir="ltr"> A  19.497000000000   0.000000000000   0.000000000000 </span></span></div><div><span dir="ltr"><span dir="ltr"> B  -9.748500000000  16.884897297585   0.000000000000 </span></span></div><div><span dir="ltr"><span dir="ltr"> C   0.000000000000   0.000000000000  48.982084201000 </span></span></div><div><span dir="ltr"><span dir="ltr"> PERIODIC XY </span></span></div><div><span dir="ltr"><span dir="ltr"> &END CELL</span></span><p>However, the calculation stops with the following error:</p><span dir="ltr"><span dir="ltr">*******************************************************************************
 *   ___                                                                       *
 *  /   \                                                                      *
 * [ABORT]                                                                     *
 *  \___/         Poisson solver for this periodicity not yet implemented      *
 *    |                                                                        *
 *  O/|                                                                        *
 * /| |                                                                        *
 * / \                                             pw_poisson_read_input.F:160 *
 *******************************************************************************

===== Routine Calling Stack =====

            5 pw_env_rebuild
            4 qs_env_rebuild_pw_env
            3 qs_env_setup
            2 qs_init_subsys
            1 CP2K</span></span><p>I am using CP2K version 2026.1.</p><p>Is the WAVELET Poisson solver expected to support <span dir="ltr">PERIODIC XY</span>, or is it currently limited to other periodicity settings? If this combination is not implemented, what would be the recommended approach for treating a slab with an adsorbed molecule using two-dimensional periodic boundary conditions? I would like to avoid face this problem with XYZ periodicity + dipole correction.</p><p>I have attached the complete input file for reference.</p><p>Thank you very much in advance for your help.</p><p>Best regards,<br />Marco</p></div>

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