Hi, > I'm trying to get the transmission coefficients for up and down spin > channels in graphene with Kane-Mele Hamiltonian (including Rashba term). > So it needs to write the Hamiltonian for up and down spin separately. > > I started with this, > sys=kwant.Builder() > lat_u=kwant.lattice.honeycomb() > lat_d=kwant.lattice.honeycomb() > a,b= lat_u.sublattices > c,d= lat_d.sublattices > > My confusion is that, can I declare these sublattices for up and down spins.
Sure you can declare them! Kwant doesn't know anything about what the different degrees of freedom in your system actually *mean* -- it's up to you to encode that information by putting the correct Hamiltonian for your problem. Thanks, Joe
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