toolbox/makesig
Introduction
To calculate real physical quantities, such as the optical conductivity, Seebeck coefficient, thermopower, etc., the self-energy function on the real axis is an essential input. With the Pade approximation[1], we can convert the self-energy function from the Matsubara frequency to real frequency axis. We implemented the Pade approximation for $\Sigma(i\omega_n)$ in the HIBISCUS component.
The makesig code is often used to transform self-energy functions from Matsubara frequency representation to real frequency representation via the Pade approximation. The results are very sensitive to the data noises in the self-energy function. So we do not recommend to use this code to perform analytical continuation for the self-energy function. However, the HIBISCUS/swing code may be a better choice.
Usage
$ ./msig
Input
- See the terminal prompt
- solver.sgm.dat (necessary)
Output
- sig.sgm.dat
Comment
N/A
- 1H. Vidberg and J. Serene, J. Low Temp. Phys. 29, 179 (1977).