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October 2017

22 participants
22 discussions

Band structure with a periodicity larger than the lattice constant
by Michael Beconcini 06 Oct '17

06 Oct '17

Dear all, I would like to compute the band structure of a honeycomb lattice with a periodic field of periodicity d, with *d>a *(*a* the lattice constant). What I have thought is to impose a translation symmetry to the leads with a period *d* instead of *a*, as written below. Can kwant do this and is this the correct way to do it? sym0 = kwant.TranslationalSymmetry((-d, 0.)) sym1 = kwant.TranslationalSymmetry((d, 0.)) sym0.add_site_family(A, other_vectors=[(-d, 2*d)]) sym0.add_site_family(B, other_vectors=[(-d, 2*d)]) sym1.add_site_family(A, other_vectors=[(-d, 2*d)]) sym1.add_site_family(B, other_vectors=[(-d, 2*d)]) Thank you very much for your attention and for this amazing package! Best, Michael Beconcini

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definition of tag
by Prof. CHAN Kwok Sum 05 Oct '17

05 Oct '17

Dear Kwant developer, I want to know more about Hoppingkind and tag. Is the tag of a site the order pair (i,j ) in lat(i,j) which is the site considered? This is for two dimension, for three dimension it should be (i,j,k) of lat (I,j,k). KS Chan Disclaimer: This email (including any attachments) is for the use of the intended recipient only and may contain confidential information and/or copyright material. If you are not the intended recipient, please notify the sender immediately and delete this email and all copies from your system. Any unauthorized use, disclosure, reproduction, copying, distribution, or other form of unauthorized dissemination of the contents is expressly prohibited.

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