Layer-by-layer entangled spin-orbital texture of the topological surface state in Bi2Se3.

@article{Zhu2013LayerbylayerES,
  title={Layer-by-layer entangled spin-orbital texture of the topological surface state in Bi2Se3.},
  author={Zhigang Zhu and Christian Neil Veenstra and G. Levy and Alberto Ubaldini and Paul Syers and Nicholas P. Butch and Johnpierre Paglione and Maurits W. Haverkort and Ilya Elfimov and Andrea Damascelli},
  journal={Physical review letters},
  year={2013},
  volume={110 21},
  pages={
          216401
        }
}
We study Bi(2)Se(3) by polarization-dependent angle-resolved photoemission spectroscopy and density-functional theory slab calculations. We find that the surface state Dirac fermions are characterized by a layer-dependent entangled spin-orbital texture, which becomes apparent through quantum interference effects. This explains the discrepancy between the spin polarization obtained in spin and angle-resolved photoemission spectroscopy-ranging from 20% to 85%-and the 100% value assumed in… 
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