Hi Adel,
Please check the documentation [1]. Since you have multiple site
families, you need to specify the conservation law as a dictionary, so
{metal_like_sub: -np.kron(sigma_z, np.eye(3)), C_like_sub1: -sigma_z,
C_like_sub2: -sigma_z}.
Best,
Anton
https://kwant-project.org/doc/1/reference/generated/kwant.builder.Builder#kwant.builder.Builder
On Sat, 14 Aug 2021 at 16:08, Adel Belayadi <adelp...@gmail.com> wrote:
>
> Dear Kwant user,
> Good day and I hope this email finds you well.
> Using conservation law was fully explained, in the Kwant mailing list, while
> we are having sublattices with the same degree of freedom (same number of
> orbitals). For instance, if we have two sites with 3 orbitals in the case of
> a spin full Hamiltonian, the onsite matrix is (onsite_matrix(6*6) for each
> site ). So in this case, the conservation law will be straightforward:
> conservation_law=-np.kron(sigma_z, np.eye(3)).But what would be the case if
> we are dealing with sublattices which have different numbers of orbitals?
>
> In my case, I am interested in spin conductance. I am using 3 sublattices
> with different orbitals. Let us say for instance
> sublattice0 has (6-orbitals), sublattice1 with (2-orbitals) and sublattice2
> with (2-orbitals). In fact I am working on hetero-structure with two sites of
> C-like(pz with spin up and down) and one site of metal-like(3d-orbitals with
> spin up and down). I can resume my lattice as follow
>
> lat = kwant.lattice.general(prim_vecs, basis=[ [...], [...], [...]] ,
> norbs=[6, 2, 2])
> metal-like_sub, C-like_sub1, C-like_sub2 = lat.sublattices
>
> According to my understanding the conservation law would be something like
> conservation_law=-np.kron(sigma_z, np.eye(5)). However Kwant raises an error
> with my choice of the conservation law.
>
> Is there something missing with my understanding of the conservation law!. Or
> in the case of different orbitals per site, we need to define two lattices
> (lattice1 for spin up and lattice2 for spindown).
> Thanks in advance,
> Best
>
>
>
