Hi Priyanka, Indeed, the missing factor of 2 is due to spin degeneracy, which you did not include in your Hamiltonian. You may just multiply the conductance by 2.
Best, Anton On Tue, 21 Jan 2020 at 17:01, MS. PRIYANKA SINHA <[email protected]> wrote: > > Dear Sir, > I was trying to calculate the Integer quantum Hall effect > in graphene with the help of Laughlinargument.ipynb. For square lattice the > quantization is okay ( ne^2/h). But for graphene it is (2n+1) 2e^2/h. I am > getting the quantization like 1, 3, 5, 7 e^2/h in graphene which seems there > is missing of factor 2. Is the Hall conductivity I am getting is in 2e^2/h > unit or should I multiply the data by 2 to get the quantization like 2, 6, > 10 which is well-known IQHE in graphene. > > It will be really helpful If you > kindly clear my doubts regarding this. > > > Thanking You, > Priyanka Sinha > >
