Hi,
The documentation was corrected, but the new documentation version is not in the "stable" documentation yet because we did not make a new release. The updated documentation is available in the "dev" docs: https://kwant-project.org/doc/dev/reference/generated/kwant.physics.PropagatingModes Happy Kwanting, Joe On 10/16/2017 11:23 AM, George Datseris wrote: > Dear All, > > (thanks so much for kwant ;) ) > > I am wondering whether there is a mistake/typo in the docstring of the > PropagatingModes object. > > The reason is the following: In a simple lead (specifically graphene > zigzag nanoribbon) at energy that excites 6 modes (only 3 with > positive derivative dE/dk), > when getting the `PropagatingModes` (either through physics.modes or > by the Smatrix), and I get the momenta and velocities, it looks like > this: > > In [35]: modes > Out[35]: <kwant.physics.leads.PropagatingModes at 0x2139805ecf8> > > In [36]: modes.momenta > Out[36]: > array([-2.12874239, 2.0566145 , 2.06992722, 2.12874239, -2.0566145 , > -2.06992722]) > > In [37]: modes.velocities > Out[37]: > array([-1.91098658, -2.24527103, -1.66541483, 1.91098658, 2.24527103, > 1.66541483]) > > > Now, the docstring of Propagating modes states: > >> The first half of the >> modes have negative velocity, the second half have positive velocity. >> The >> modes with negative velocity are ordered from larger to lower >> momenta, the >> modes with positive velocity vice versa. > However, this is not what I see. The first half, with negative > velocity, is clearly sorted from smaller to bigger momenta, while the > second half (with positive velocity) is sorted from bigger to slower > momenta. This is the exact opposite of the docstring. > > Thus I am writing this mail to see if I have misunderstood something > or if this is simply a typo mistake. > > Best, > George >
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