Re: [Kwant] Kwant-discuss Digest, Vol 15, Issue 2

well i am trying to generate the spin orbital coupling in the graphne lattice...or I should say I am looking for Quantum spin hall effect .Here i am using 2x2 matrix.I am not very sure about this also.As gien in tutorial SOI is -i*alpha(delx*sigma_y-dely*sigma_x),which gives me hopping in x and y diretions respectively.Here in graphene lattice the hopping is 3 different directions as i mentioned in last post .and i want to write hop for these .Do I need to take the sin cos component of above expression or what ? please help.thank you ANANT VIJAY VARMA M.Tech. STUDENT CENTER FOR CONVERGING TECHNOLOGIES UNIVERSITY OF RAJASTHAN JAIPUR On Fri, Nov 7, 2014 at 5:33 PM, wrote:

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Today's Topics:

1. Re: About spin orbital coupling (Joseph Weston)

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Message: 1 Date: Thu, 06 Nov 2014 14:08:24 +0100 From: Joseph Weston To: kwant-discuss@kwant-project.org Subject: Re: [Kwant] About spin orbital coupling Message-ID: <545B72C8.8060103@cea.fr> Content-Type: text/plain; charset="iso-8859-1"

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Hello everyone. I am applying the spin orbit coupling to the honeycomb lattice but there are three different kind of hopping and I am writing

On 06/11/14 08:45, ANANT wrote: this

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sys[lat.shape(shape, (2.46, 0))] =onsite sys[kwant.builder.HoppingKind((0, 0), A,B )]= -t * s_0 - 1j * alpha * s_y

sys[kwant.builder.HoppingKind((0,1), A,B )] = -t * s_0 + 1j * alpha * s_x

sys[kwant.builder.HoppingKind((-1,1), A,B )] = -t * s_0 + 1j * alpha *

s_x

...

But this is not right .What should I write in place of this.? please

help me

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thank yo u in advance

Hello,

Can you be a bit more specific about what it is that you are doing: - what model are you are using for spin orbit? - what is the expected output? - what is the actual output?

It is always useful to be as specific as possible, especially through the medium of email.

Thanks,

Joe