mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 03:33:50 +01:00
29 lines
895 B
Python
29 lines
895 B
Python
from pytriqs.lattice.tight_binding import *
|
|
from pytriqs.dos import HilbertTransform
|
|
from pytriqs.gf.local import GfImFreq
|
|
|
|
# Define a DOS (here on a square lattice)
|
|
BL = BravaisLattice(Units = [(1,0,0) , (0,1,0) ], orbital_positions= {"" : (0,0,0)} )
|
|
t = -1.00 # First neighbour Hopping
|
|
tp = 0.0*t # Second neighbour Hopping
|
|
hop= { (1,0) : [[ t]],
|
|
(-1,0) : [[ t]],
|
|
(0,1) : [[ t]],
|
|
(0,-1) : [[ t]],
|
|
(1,1) : [[ tp]],
|
|
(-1,-1): [[ tp]],
|
|
(1,-1) : [[ tp]],
|
|
(-1,1) : [[ tp]]}
|
|
|
|
TB = TightBinding (BL, hop)
|
|
d = dos(TB, n_kpts= 500, n_eps = 101, name = 'dos')[0]
|
|
|
|
#define a Hilbert transform
|
|
H = HilbertTransform(d)
|
|
|
|
#fill a Green function
|
|
G = GfImFreq(indices = ['up','down'], beta = 20)
|
|
Sigma0 = GfImFreq(indices = ['up','down'], beta = 20); Sigma0.zero()
|
|
G <<= H(Sigma = Sigma0,mu=0.)
|
|
|