Layer k -projection and unfolding electronic bands at interfaces

-projection and unfolding electronic bands at interfaces},
  author={Mingxing Chen and Michael Weinert},
  journal={Physical Review B},
The k-projection method provides an approach to separate the contributions from different constituents in heterostructure systems and can act as an aid to connect the results of experiments and calculations. We show that the technique can be used to "unfold" the calculated electronic bands of interfaces and supercells, and provide local band structure by integrating the projected states over specified regions of space, a step that can be implemented efficiently using fast Fourier transforms. We… 
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