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Sakano M, Bahramy MS, Katayama A, et al. Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors. Phys Rev Lett. 2013;110(10):107204doi: 10.1103/PhysRevLett.110.107204.
Sakano, M., Bahramy, M. S., Katayama, A., Shimojima, T., Murakawa, H., Kaneko, Y., Malaeb, W., Shin, S., Ono, K., Kumigashira, H., Arita, R., Nagaosa, N., Hwang, H. Y., Tokura, Y., & Ishizaka, K. (2013). Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors. Physical review letters, 110(10), 107204. https://doi.org/10.1103/PhysRevLett.110.107204
Sakano, M, et al. "Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors." Physical review letters vol. 110,10 (2013): 107204. doi: https://doi.org/10.1103/PhysRevLett.110.107204
Sakano M, Bahramy MS, Katayama A, Shimojima T, Murakawa H, Kaneko Y, Malaeb W, Shin S, Ono K, Kumigashira H, Arita R, Nagaosa N, Hwang HY, Tokura Y, Ishizaka K. Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors. Phys Rev Lett. 2013 Mar 08;110(10):107204. doi: 10.1103/PhysRevLett.110.107204. Epub 2013 Mar 07. PMID: 23521291.
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Phys Rev Lett. 2013 Mar 08;110(10):107204. doi: 10.1103/PhysRevLett.110.107204. Epub 2013 Mar 07.

Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors.

Physical review letters

M Sakano, M S Bahramy, A Katayama, T Shimojima, H Murakawa, Y Kaneko, W Malaeb, S Shin, K Ono, H Kumigashira, R Arita, N Nagaosa, H Y Hwang, Y Tokura, K Ishizaka

Affiliations

  1. Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.

PMID: 23521291 DOI: 10.1103/PhysRevLett.110.107204

Abstract

We investigate the two-dimensional highly spin-polarized electron accumulation layers commonly appearing near the surface of n-type polar semiconductors BiTeX (X=I, Br, and Cl) by angular-resolved photoemission spectroscopy. Because of the polarity and the strong spin-orbit interaction built in the bulk atomic configurations, the quantized conduction-band subbands show giant Rashba-type spin splitting. The characteristic 2D confinement effect is clearly observed also in the valence bands down to the binding energy of 4 eV. The X-dependent Rashba spin-orbit coupling is directly estimated from the observed spin-split subbands, which roughly scales with the inverse of the band-gap size in BiTeX.

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