File: polarizability.py

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from abc import ABC, abstractmethod


class StaticPolarizabilityCalculator(ABC):
    @abstractmethod
    def __call__(self, atoms, *args, **kwargs):
        """Calculate the polarizability tensor

        atoms: Atoms object

        Returns:
          Polarizabilty tensor (3x3 matrix) in units (e^2 Angstrom^2 / eV)
          Can be multiplied by Bohr * Ha to get (Angstrom^3)
        """