Ian R George

Hello, I messaged a coupled months back on a basic question. I have another one.

KWANT has been very useful to me so far, and I like to think I've made some progress with it, however, I still occasionally am tripping up on basic things. I'm sorry if the answer to this is obvious.

I am trying to create an SNS junction to study helical ABSs in a magnetic

field, but I'm having some basic problems implementing the magnetic field in the code along with the Bogliubov de-Gennes equation. Using the tutorials and paper as my guide, I'm defining a global method for the hopping and have tried to use it in the system, without success. How would I implement it with the hoppings with the superconductor formalism, with separate leads for electrons and holes? Is there something I'm missing on how to do it-you can't just use the magentic field as the hopping, as in the examples. Would I just subtract it as a gauge from the Hamiltonian diagonal entries, as you do analytically? Is there an example out there for that?

At the moment, as a side question, when I try to simply to multiply the

magnetic field with 4t-mu, I'm getting a ValueError: that the hoppings then do not match the dimensions of the onsite Hamiltonian. So I'm guessing that's not the way of going about it.

Thank you.

I forgot to ask this in the previous message. My apologies. Is it generally OK to define the magnetic field inside the make_system routine as opposed to a global method, if it works for your purposes, or are their risks to this.