Dear Sir, If I calculate the Rashba term, (S \times d_ij)_z, for one case the Sigma_X terms comes out (in KWANT along (0,0) direction). That's why I have included this term in my system. There is no other reason. It feels that there may be something wrong in my calculation since you have said about the Sigma_z conservation. Can I show you my calculations. It'll not take much time, there are only 5-6 lines. Hope you don't mind. With Regards, Sudin

Dear Sudin,

1. I mean the conservation of sigma_z.

2. There is no motivation for it, that's just what you have done in your code.

Best, Anton

On Wed, Nov 23, 2016 at 10:44 PM, Sudin Ganguly <sudin@iitg.ernet.in> wrote:

...

Dear Sir,

First of all, I would like to apologize in advance, if this mail bothers you.

Today you send me reply about the smatrix for up and down spins in graphene. That was very much helpful to me.

I would like to ask you about the conservation law in the leads, since it does not seem right to post this kind of question in KWANT forum.

1. is this Conservation law meant the current conservation? If this is so, how do I understand this.

2. Kane-Mele model said that in graphene there is NN Rashba interaction, and other is NNN intrinsic SO interaction. Then what is the motivation to avoid these kind of interactions in the leads.

I'll be eagerly waiting for your reply.

With Regards, Sudin

-- ==================== Sudin Ganguly Research Scholar Dept. of Physics IIT Guwahati Assam,India-781039 ===================