Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-01-28
Phys. Rev. Lett. 106, 257004 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
published version, 4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.106.257004
We performed high-resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi$_2$Se$_3$, a model topological insulator. By tuning the photon energy, we found that the topological surface state is well separated from the bulk states in the vicinity of $k_z=Z$ plane of the bulk Brillouin zone. The spin-resolved measurements in that region indicate a very high degree of spin polarization of the surface state, $\sim 0.75$, much higher than previously reported. Our results demonstrate that the topological surface state on Bi$_2$Se$_3$ is highly spin polarized and that the dominant factors limiting the polarization are mainly extrinsic.
Chu Steven
Fedorov Alexi V.
Gardner David
Gu G.-D.
Lee Young Sam
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