QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: Tuhin039 on April 5, 2018, 15:25

Title: Dielectric Constant
Post by: Tuhin039 on April 5, 2018, 15:25

Hello everyone,
I have calculated the dielectric constant of a material, but I did not find the unit of the dielectric constant. I could not able to calculate the excitonic binding energy as this unit is not known to me.

Title: Re: Dielectric Constant
Post by: Petr Khomyakov on April 5, 2018, 15:58

It is the relative permittivity that is outputted in QuantumATK, i.e., it is the dielectric constant in units of vacuum permittivity, ε0 = 8.854187817 x 10^{−12} F⋅m^{−1} (farads per metre), see  https://en.wikipedia.org/wiki/Relative_permittivity and https://en.wikipedia.org/wiki/Vacuum_permittivity.