Arunabha Ghoshal wrote:
According to the physics of graphene, the carbon-carbon bond length is approximately 0.142 nm. But after running the above code, I checked that the C-C bond length of the honeycomb lattice is coming as 1/sqrt(3) nm i.e. ~0.58 nm. Therefore, I am feeling quite confused as I am failing to understand where I am going wrong or whether am overlooking any fundamental concepts.
The function kwant.lattice.honeycomb returns a honeycomb lattice where the lattice constant of the underlying triangular lattice is determined by the parameter 'a' that has a default value of 1. Kwant does not take care of units, it’s up to you to attribute (or not) any meaning to the real space position of Kwant sites. By default, the real space position is only used for plotting.