Physical meaning of terms in the Qi, Wu, Zhang model

[Joker93]

The Hamiltonian of the Qi, Wu, Zhang model is given by(in momentum space):
## H(\vec{k})=(sink_x) \sigma_{x}+(sink_y) \sigma_{y}+(m+cosk_x+cosk_y)\sigma_{z} ## .
What is the physical meaning of each component of this Hamiltonian?

Note: for the real space Hamiltonian(where maybe the analysis of the physical content each of the term is easier), see attached.

 

[Joker93]

Could someone help with the math formatting? I can't get it right!

 

[Demystifier]

Could someone help with the math formatting? I can't get it right!

Don't use a bold letter H within ##'s. Use {\bf H} instead.

 

[DrDu]

better even \mathbf{H}