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C. Jozwiak, Y. L. Chen, A. V. Fedorov, J. G. Analytis, C. R. Rotundu, A. K. Schmid, J. D. Denlinger, Y. -D. Chuang, D. -H. Lee, I. R. Fisher, R. J. Birgeneau, Z. X. Shen, Z. Hussain, and A. Lanzara. Widespread spin polarization effects in photoemission from topological insulators. Physical Review B, 84, p. 165113, 2011.

Abstract: High-resolution spin- and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the
three-dimensional topological insulator Bi2Se3 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.

Keywords: topological insulator, ARPES

URL: http://prb.aps.org/abstract/PRB/v84/i16/e165113

Posted by Costel R Rotundu

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