Dear Kwant authors
I am Yongping Du from Nanjing University of Science and Technology. I have been 
using the KPM method to calculate the transport properties of various graphene 
nanostructures, together with Prof. A. P. Jauho. As a benchmark, I calculated 
the conductance and density of states of the Haldane model.  To my surprise,  I 
found some differences between my numerical results and the ones obtained with 
Kwant. I carefully checked every term of Haldane model in my implementation and 
found that the hopping direction of two next nearest neighbor hopping terms was 
the key to those differences.  By reversing the direction of the hopping term 
in my program, I could reproduce the results from Kwant.  However, I can find 
no physical justification for this change. 
I would be most grateful if you can help me to remove this discrepancy.  

Best regards
Yongping Du

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