Physics – Condensed Matter – Materials Science
Scientific paper
2011-10-24
Phys. Rev. B 84, 165113 (2011)
Physics
Condensed Matter
Materials Science
10 pages, 6 figures
Scientific paper
10.1103/PhysRevB.84.165113
High resolution spin- and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator Bi$_2$Se$_3$ using a recently developed high-efficiency spectrometer. The topological surface state's helical spin structure is observed, in agreement with theoretical prediction. Spin textures of both chiralities, at energies above and below the Dirac point, are observed, and the spin structure is found to persist at room temperature. The measurements reveal additional unexpected spin polarization effects, which also originate from the spin-orbit interaction, but are well differentiated from topological physics by contrasting momentum and photon energy and polarization dependencies. These observations demonstrate significant deviations of photoelectron and quasiparticle spin polarizations. Our findings illustrate the inherent complexity of spin-resolved ARPES and demonstrate key considerations for interpreting experimental results.
Analytis James G.
Birgeneau Robert J.
Chen Yulin
Chuang Y.-D.
Denlinger Jonathan D.
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