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:-> 1996 value = 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}---> 61 smatrix = 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,--> 372 params=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,--> 164 params=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.')-> 1885 raise 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. On Tue, Dec 4, 2018 at 3:21 PM Joseph Weston <joseph.westo...@gmail.com> wrote: > Hi Ali, > > > > I want to find conductance of a heterostructure using semicon library. > > When I just use coords='z', everything is OK. But, when I want to > > change it to two dimensions like 'xz', I encounter an error. Would you > > please tell me how I can fix it? I hope it is not just a > > simple mistake which I am not aware. Your time and consideration are > > greatly appreciated in advance. Please find attached the code > > correspondent to what I mentioned above. > > > Thanks for posting the script, but you'll need to give more information > before anyone else can help you: > > > + what version of Kwant and semicon are you using > > + what error was produced? Please provide a full traceback > > > Happy Kwanting, > > > Joe > >