Dipole moment for periodic system

[UtpalLab123]

Dear Sir,
I am encountering a problem calculating the dipole moment for a periodic 2D system, such as twin-graphene. Using the electron density difference HDF5 file, I have successfully calculated the dipole moment for H₂O, NH₃, and HF, with values that exactly match the literature. However, when applying the same code to the periodic system, such as twin-graphene, it shows an intrinsic dipole moment instead of the expected zero dipole moment

[Anders Blom]

Are you talking about the out-of-plane dipole moment? That cannot be computed with the method you refer to, but perhaps https://www.sciencedirect.com/science/article/abs/pii/S0169433222026915 is helpful.