Thanks for the information!
> Thank you for your quick response. I am using kwant 1.3.3 version and
> semicon 0.1.0 version. I think the error is related to calling
> parameters function which are stored as a tuple. By the way, this is
> the error I encountered:
>
> TypeError Traceback (most recent call last)
> /home/ali/anaconda3/lib/python3.6/site-packages/kwant/builder.py in
> hamiltonian(self, i, j, params, *args)
> 1995 try:
> -> 1996value = value(self.sites[i], **params)
> 1997 except Exception as exc:
>
> <string> in onsite(site, Delta_0, E_0, E_v, P, gamma_0, gamma_1, gamma_2,
> hbar,
> k_y, m_0)
>
> TypeError: __call__() takes 2 positional arguments but 3 were given
>
> The above exception was the direct cause of the following exception:
>
> UserCodeError Traceback (most recent call last)
> <ipython-input-5-9c34d828bfe1> in <module>()
> 59 # compute the scattering matrix at a given energy
> 60 p = {'k_y': 0, **two_deg_params}
> ---> 61smatrix = kwant.smatrix(syst, energy, params=p)
> 62
> 63 # compute the transmission probability from lead 0 to
>
> /home/ali/anaconda3/lib/python3.6/site-packages/kwant/solvers/common.py in
> smatrix(self, sys, energy, args, out_leads, in_leads,
> check_hermiticity, params)
> 370 linsys, lead_info = self._make_linear_sys(syst, in_leads, energy,
> args,
> 371 check_hermiticity,
> False,
> --> 372params=params) 373
> 374 kept_vars = np.concatenate([coords for i, coords in
>
> /home/ali/anaconda3/lib/python3.6/site-packages/kwant/solvers/common.py in
> _make_linear_sys(self, sys, in_leads, energy, args, check_hermiticity,
> realspace, params)
> 162 lhs, norb = syst.hamiltonian_submatrix(args, sparse=True,
> 163 return_norb=True,
> --> 164params=params)[:2] 165 lhs = getattr(lhs, 'to' +
> self.lhsformat)()
> 166 lhs = lhs - energy * sp.identity(lhs.shape[0],
> format=self.lhsformat)
>
> kwant/_system.pyx in kwant._system.hamiltonian_submatrix()
>
> /home/ali/anaconda3/lib/python3.6/site-packages/kwant/builder.py in
> hamiltonian(self, i, j, params, *args)
> 1996 value = value(self.sites[i], **params)
> 1997 except Exception as exc:
> -> 1998_raise_user_error(exc, value)
> 1999 else:
> 2000 try:
>
> /home/ali/anaconda3/lib/python3.6/site-packages/kwant/builder.py in
> _raise_user_error(exc, func)
> 1883 msg = ('Error occurred in user-supplied value function "{0}".\n'
> 1884 'See the upper part of the above backtrace for more
> information.')
> -> 1885raise UserCodeError(msg.format(func.__name__)) from exc
> 1886
> 1887
>
> UserCodeError: Error occurred in user-supplied value function "onsite".
> See the upper part of the above backtrace for more information.this certainly looks like a bug in semicon. I've managed to reproduce the bug, but I don't understand why it occurs. I inspected what was happening using the Python debugger and it seems to me that everything should work (but clearly it doesn't!). Unfortunately the author of semicon is no longer working in academia, and the semicon project is currently without a maintainer (and it's not even v1.0!), so I am not sure what the best course of action is going forward. Happy Kwanting, Joe
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