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