Electron electric dipole moment

The electron electric dipole moment de is an intrinsic property of an electron such that the potential energy is linearly related to the strength of the electric field: U = − d e ⋅ E . {\displaystyle U=-\mathbf {d} _{\rm {e}}\cdot \mathbf {E} .} The electron's electric dipole moment (EDM) must be collinear with the direction of the electron's magnetic moment (spin).