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Today's Topics:
1. Re: Kwant-discuss Digest, Vol 15, Issue 2 (ANANT VIJAY)
2. Re: About spin orbital coupling (Joseph Weston)
----------------------------------------------------------------------
Message: 1
Date: Mon, 10 Nov 2014 12:02:21 +0530
From: ANANT VIJAY <anantvijaycct@gmail.com>
To: kwant-discuss@kwant-project.org
Subject: Re: [Kwant] Kwant-discuss Digest, Vol 15, Issue 2
Message-ID:
<CAN8vUmXQR=0AW0J87=tM6hAdWgf5_H1ut4u+HQeAGC0hGHkPBg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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, <kwant-discuss-request@kwant-project.org>
wrote:
> Send Kwant-discuss mailing list submissions to
> kwant-discuss@kwant-project.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://mailman-mail5.webfaction.com/listinfo/kwant-discuss
> or, via email, send a message with subject or body 'help' to
> kwant-discuss-request@kwant-project.org
>
> You can reach the person managing the list at
> kwant-discuss-owner@kwant-project.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Kwant-discuss digest..."
>
>
> Today's Topics:
>
> 1. Re: About spin orbital coupling (Joseph Weston)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 06 Nov 2014 14:08:24 +0100
> From: Joseph Weston <joseph.weston@cea.fr>
> 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"
>
> On 06/11/14 08:45, ANANT wrote:
> > 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
> this
> >
> >
> > 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
> > 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
>
>
>
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Message: 2
Date: Mon, 10 Nov 2014 11:02:34 +0100
From: Joseph Weston <joseph.weston@cea.fr>
To: kwant-discuss@kwant-project.org
Subject: Re: [Kwant] About spin orbital coupling
Message-ID: <54608D3A.6020201@cea.fr>
Content-Type: text/plain; charset="utf-8"
On 10/11/14 07:32, ANANT VIJAY wrote:
> 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
Hi again,
It seems to me that your question is more about the physics of the
system you are trying to simulate, rather than how to something which is
specific to kwant. What I mean by this is that you would have exactly
the same question if you were trying to solve this tight-binding model
analytically or using any other tight-binding transport software.
We try to keep this mailing list purely about kwant, as there are
already plenty of resources on the web and elsewhere where answers can
be found to questions, such as yours, about the physics. For example,
http://physics.stackexchange.com/
is quite good, and has quite an active community. I also googled
"Spin orbit graphene" and the second link was to this PRB which
should answer your question:
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.245412
Thanks,
Joe
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