Dear Yu, In kwant you simulate models. So it is up to you to decide what corresponds best to your real system.
Yes you can change the value of the hopping depending on the justification you may find. It is also possible to put it as a parameter and do your study as a function of the value of "t". You can also choose it as a matrix in order to take into account the different orbitals in your system I hope this helps, Adel On Wed, Feb 5, 2020 at 11:22 AM Yu Li <yu...@postgrad.manchester.ac.uk> wrote: > Dear all, > > Now I’m studying some transport property based on multilayered system, > with nonmagnetic layer/ferromagnetic layer (NM/FM) stack. > > May I ask when creating a tight binding system, and setting hoppings by > the following function: > > syst[(lat(1, 0), lat(1, 1))] = t, > > how to associate the hopping with a realistic system? Such as hoppings > between FM and FM atoms, or between FM and NM atoms? I found in many > literatures people just simply put t=1, but I assume the value should > depend on the type of atoms. > > My another question is, is it possible to define more than one type of > hopping between two sites? > For the tight-binding approximation of p electrons, there are two types of > hopping integrals: Vppσ, and Vppπ, so I’m wondering if it’s possible to > simulate the effect of both hoppings? > > Thanks a lot for reading my questions! > Cheers, > Yu Li > -- Abbout Adel
