has anyone seen this type of IV curve?

[esp]

I am wondering if anyone out there has seen this happen with graphene, and if you have any insight into what it might mean?  How is it possible that the IV curve is so bumpy? all transmission calcs were saved with specific object ids corresponding to the Vds and Vgs values (concatenated into a string), and plotted using the same object ids, ...  Dr. Blom saw the script and did not find anything obviously wrong, so then, what is this?  if it is physical then ok, but I cant explain it .. anyone?

[Nordland]

Yes I have seen it many times before and it is quite normal.

My best example (which is unpublished for now) is a very simple system of graphene ribbons.
Make the graphene ribbon system quite wide, and make it spin-polarized such the edges have opposite spin.
Then connect this to graphene ribbon setup in the same way, but just a nudge less wide.

The IV curve for this system shows the almost ideal quantum conductance behavior where the current rises to a certain level, and remains constant for some time, just to suddenly rise to another level, and so fourth.

[esp]

Interesting, thank you.