Finite Chain with different unit cell at the beginning
Posted: 04 Jul 2019, 14:56
I am struggling with the following issue: I have a 1D lattice (chain) that consists of a repeated unit cell formed by two different sites (a spin-half site and a fermionic site). If I realize an open chain by repeating the unit cell L times, the first site will always be a spin site and the last one a fermion site. While this is not necessarily a problem, I would like the first and last sites to be fermions, so that in total there are L fermionic sites and only L-1 spin sites. Does anyone have suggestions on the best way to do so?
I'm sure that there are some workarounds, e.g. I could pin the first spin with some large external field so that it is always up no matter what the rest of the system does. Another possibility would be to work with a single unit cell of 2L-1 sites, but this sounds very inconvenient. Is there a clean way to do what I have in mind by physically removing the very first site?
I'm sure that there are some workarounds, e.g. I could pin the first spin with some large external field so that it is always up no matter what the rest of the system does. Another possibility would be to work with a single unit cell of 2L-1 sites, but this sounds very inconvenient. Is there a clean way to do what I have in mind by physically removing the very first site?