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Executing flx in the directory CSF results in the
following short help message
flex_input_file [options]
Options:
-T |
Temperature (0.001) |
-U |
Coulomb repulsion (1) |
-Ns |
Degeneracy of bands ((2)) |
-alpha |
Mixing parameter (0.2) |
-ph_reduce |
Weather to screen PH diagrams with PP effective interaction (0) |
-Na |
Number of additional points around fermi function (50) |
-si |
Data will be read from standard input |
-ph |
Wheather to include PH-channel (1) |
-pp |
Wheather to include PP-channel (1) |
-gw |
Wheather to include GW-channel (1) |
-gi |
The input is green's function rather than spectral functions (0) |
All parameters here have the same meaning as above except the
parameter -gi is added and parameter Ns is more
complicated to set properly. The case that we are able to treat with
this simple peace of code is the case of crystal field splitted levels
that have arbitrary degeneracy but they are not coupled through the
off-diagonal elements of hybridization . A typical case is an
shell that can acquire 7 electrons and is usually splitted into
6+6+2 multiplets. The input for Ns should than be -Ns
"(6,6,2)". Note here that the quotation marks are required for every
nonatomic expression for shell to interpret the input properly.
The example command line is as usual prepared in the
CFS/work/history.flex and reads
../flx start/gloc.inp.210 -gi -U 4 -T 0.03 -Ns "(6,6,2)" -ph_reduce 1 -gi
In couple of second, the output is written in the file called
sig.out that contains all nonequivalent self-energies (in
this case three). In addition, there are also output files called
Sigma.xxx. Each of them corresponds to one nonequivalent bath
(Sigma.000 to the first bath, Sigma.001 to the second and so on) and
contains the following information
- second column contains the real part of the input green's function
- third column contains the input spectral function
- fourth and fifth column is the total self-energy
- sixth column is the second order self-energy only
- seventh column is the particle hole ladder contribution only
- eighth column is the particle particle ladder contribution only
- ninth column is the gw contribution only
Next: About this document ...
Up: Running FLEX program
Previous: SUN FLEX
Kristjan Haule
2004-08-23