Hi tasfaye mamuye,
Maxent is very tricky to use, it is easy to get consistent but wrong spectra. We do not have a tutorial for it available. However, we do have a parameter file as part of hybdoc.pdf. Please have a look at Fig. 1 and try to adapt this parameter file to your data.
I suggest that you start with a few trial functions that you know on the real axis (e.g. a Gaussian, a double Gaussian, etc) and continue these to the imaginary axis, then add some noise, and then use maxent to continue it back to the real axis. This will give you a feeling for how maxent behaves and where it is reliable.
If you’re interested in the method itself then have a look here:
M. Jarrell and J. E. Gubernatis, Physics Reports, 269, 133
(1996), ISSN 0370-1573.
Regarding plotting the phase diagram: Are you interested in the Mott transition in the single site DMFT for the Hubbard model? If you’re just interested in checking if a system is metallic or insulating you can use indicators on the imaginary axis, e.g. \beta G(\beta/2), which gives you an approximation to the density of states at the Fermi energy. That’s easier and more reliable than maxent.
Best,
Emanuel
Dear developers
I'm interest on DMFT code in ALPS. I need to do analytic
continuation of the CT-QMC data to real frequency. I want to use the
ALPS MaxEnt code. But there is no elaborate documentation regarding
MaxEnt. In .bybdoc.pdf' documentation it is pointed out that a tutorial
for alps MaxEnt code will be provided elsewhere.
1. Ca someone send me the code or describe parameters,
input/output files and any necessary information to run MaxEnt ? or any
one who will guide me on MaxEnt?
2. How to plot the phase diagram (T Vs U) for the DMFT impurity silver