Hey Xiaoxiao, Indeed, Kwant's conductance matrix [1] also subtracts the trace from the diagonal, and it's also how the conductance matrix is conventionally defined.
Best, Anton [1]: https://gitlab.kwant-project.org/kwant/kwant/-/blob/master/kwant/solvers/common.py#L742-758 On Sun, 12 Sept 2021 at 13:32, <xiaoxiao.zh...@riken.jp> wrote: > > Anton Akhmerov wrote: > > # Correct the reflection blocks, so that rows and columns sum to zero. > > cond -= np.diag(cond.sum(axis=0)) > > Hello Anton (or anyone who reads this), > Sorry for waking up this old thread. May I ask why this step is necessary to > calculate a Hall conductance? I don't immediately see this requirement in the > Buttiker formula or the code after it. Does it affect the result in general? > In another kwant code of 6-terminal QHE, this step is not seen. Or is it > assumed in the kwant function conductance_matrix() ? > https://github.com/topocm/topocm_content/blob/master/w3_pump_QHE/Laughlinargument.md > > Thank you.
