Silicon said:I konw that the defect centers in a dielectric contribute to the electric polarization and thus affect the permittivity.If there is any microscopic theory can derivate the relationship between the defect centers and the permittivity?
Electric polarization is the process in which the charges within an object or material are rearranged in response to an external electric field. This results in the creation of an electric dipole moment within the material.
Defect centers in a dielectric are areas within the material where the arrangement of atoms or molecules is not perfect. These defects can result in the presence of additional charges, such as impurity ions, that can contribute to the overall electric polarization of the material.
When an external electric field is applied to a dielectric material, the defect centers can become polarized and contribute to the overall polarization of the material. This is because the charges within the defect centers are able to move in response to the electric field, resulting in the creation of an electric dipole moment.
The strength of electric polarization in a material is affected by several factors, including the magnitude and direction of the external electric field, the dielectric constant of the material, and the presence and distribution of defect centers within the material.
Electric polarization can be measured using various techniques, such as measuring the induced electric dipole moment in the material, or by measuring the dielectric constant of the material in the presence and absence of an external electric field. Other methods include using polarization-sensitive instruments, such as polarimeters or ellipsometers.