Calculation of spectral function (focus on sub-gap ABS peaks)
Rok Zitko, July 2011


.dat - broadened spectral function, tabulated ASCII file
.bin - raw spectral function (binned), binary file

Spectral functions are defined as -1/Pi Im <<A^\dag;B>>, where
A and B are the operators chosen in specd, e.g., specd=A-B
(note that A is conjugated!)

spec_CFS_dens_A_d-A_d.dat - impurity spectral function
spec_CFS_dens_Ac_d-A_d.dat - anomalous spectral function


Note that the spectral function is severely overbroadened since
alpha=0.8. As a consequence, i) the charge peakas are shifted
from omega=+-U/2 to smaller absolute values, ii) the spectral funciton
does not fall off at omega=+-Delta as it should;
iii) the sub-gap features are not resolved.


aw is a post-processing tool which locates the ABS peaks.
It generates two files: 1.dat (omega>0 spectral peaks)
and -1.dat (omega<0 spectral peaks). The files contain pairs
(energy,weight).
