Dear Joe,
thank you very much for your fast and compelling reply.
Exploiting your advice, that means writing
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def onsite(site, salt):
return uniform(repr(site))
def kitaev(L ,t, mu, Delta, W, salt) :
syst = kwant.Builder()
lat = kwant.lattice.chain(norbs=2)
syst[lat(0)] = -(1/2)*(mu + W*(2*onsite(lat(0), salt) - 1))*pauli3
for i in range(1,L):
syst[lat(i)] = -(1/2)*(mu + W*(2*onsite(lat(i), salt) - 1))*pauli3
syst[lat(i), lat(i - 1)] = -(t/2)*pauli3 + 1j*(Delta/2)*pauli2
return syst
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the code actually works, in the sense that no errors occur in the output
of the calling string
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t = 1
Delta = 1
L = 50
W = 1
salt = 1
mub = 3
systb = kitaev(L,t,mub,Delta,W,salt)
systb = systb.finalized()
hamatb = systb.hamiltonian_submatrix(sparse = False)
evalsb, evecsb = la.eigh(hamatb)
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However, I still do not get the role of the parameter "salt" (here
above I defined it conventionally
salt = 1): how do I have to set it ?
In the previous discussion page
https://www.mail-archive.com/kwant-discuss@kwant-project.org/msg01497.html
you claim that
"the 'salt' parameter does not have any physical meaning; it's like
the 'seed' that you typically specify to a random number generator."
Then does it mean that the physical numbers must not to change with
the set value for salt ?
Last question: the string
mub = 3
systb = kitaev(L,t,mub,Delta,W,salt)
systb = systb.finalized()
hamatb = systb.hamiltonian_submatrix(sparse = False)
evalsb, evecsb = la.eigh(hamatb)
creates the Kitaev code with just one specific configuration for
the random onsite offset, right ?
Thank you very much again and best
L.
