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Topological Surface States with Persistent High Spin Polarization across Dirac Point in Bi₂Te₂Se and Bi₂Se₂Te

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arxiv 1203.4439 v1 pith:XWQUNOZU submitted 2012-03-20 cond-mat.mes-hall

Topological Surface States with Persistent High Spin Polarization across Dirac Point in Bi$_{2}$Te$_{2}$Se and Bi$_{2}$Se$_{2}$Te

K. Miyamoto , A. Kimura , T. Okuda , H. Miyahara , K. Kuroda , H. Namatame , M. Taniguchi , S. V. Eremeev
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T. V. Menshchikova E. V. Chulkov K. A. Kokh O. E. Tereshchenko
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classification cond-mat.mes-hall
keywords topologicalspinsurfaceacrossdiracpersistentpointstates
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abstract

Helical spin textures with the marked spin polarizations of topological surface states have been firstly unveiled by the state-of-the-art spin- and angle-resolved photoemission spectroscopy for two promising topological insulators Bi$_2$Te$_2$Se and Bi$_2$Se$_2$Te. The highly spin-polarized natures are found to be persistent across the Dirac point in both compounds. This novel finding paves a pathway to extending their utilization of topological surface state for future spintronic applications.

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