Electronic Structure of the Topological Insulator Bi[subscript 2]Se[subscript 3] Using Angle-Resolved Photoemission Spectroscopy: Evidence for a Nearly Full Surface Spin Polarization
We performed high-resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi[subscript 2]Se[subscript 3], a model TI. By tuning the photon energy, we found that the topological surface state is well separated from the...
Main Authors: | , , , , , , , |
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Other Authors: | , |
Format: | Article |
Language: | English |
Published: |
American Physical Society,
2011-09-29T14:15:44Z.
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Subjects: | |
Online Access: | Get fulltext |
Summary: | We performed high-resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi[subscript 2]Se[subscript 3], a model TI. By tuning the photon energy, we found that the topological surface state is well separated from the bulk states in the vicinity of kz=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, ∼0.75, much higher than previously reported. Our results demonstrate that the topological surface state on Bi[subscript 2]Se[subscript 3] is highly spin polarized and that the dominant factors limiting the polarization are mainly extrinsic. United States. Dept. of Energy (Contract No. DE-AC02-98CH10886) United States. Dept. of Energy (DOE Grant No. DE-FG02-04ER4613) United States. Dept. of Energy (Contract No. DE-AC03- 76SF00098) |
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