Dear all, 
1. In the example of KWANT, there is a conductance vs Energy plot. In this 
plot, the unit of Energy is mentioned as [t]. what does t signify? is it in eV?
2. In the band structure of zig-zag graphene lead,  there are upper and lower 
parts in the band structure. which one is the conduction band? I'm attaching a 
figure for 2nd question. 

figure 

https://drive.google.com/file/d/1dmhZkSOWu4ERvMfP855vgbYpAyt5NTcn/view?usp=sharing

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