Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors

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

doi:10.1103/PhysRevLett.110.107204

Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors

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

Theoretical Physics Group

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	107204
Journal	Physical Review Letters
Volume	110
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.110.107204
Publication status	Published - 7 Mar 2013

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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), Article 107204. https://doi.org/10.1103/PhysRevLett.110.107204

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title = "Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors",

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.",

author = "M. Sakano and Bahramy, {M. S.} and A. Katayama and T. Shimojima and H. Murakawa and Y. Kaneko and W. Malaeb and S. Shin and K. Ono and H. Kumigashira and R. Arita and N. Nagaosa and Hwang, {H. Y.} and Y. Tokura and K. Ishizaka",

year = "2013",

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doi = "10.1103/PhysRevLett.110.107204",

language = "English",

volume = "110",

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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 2013, 'Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors', Physical Review Letters, vol. 110, no. 10, 107204. https://doi.org/10.1103/PhysRevLett.110.107204

TY - JOUR

T1 - Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors

AU - Sakano, M.

AU - Bahramy, M. S.

AU - Katayama, A.

AU - Shimojima, T.

AU - Murakawa, H.

AU - Kaneko, Y.

AU - Malaeb, W.

AU - Shin, S.

AU - Ono, K.

AU - Kumigashira, H.

AU - Arita, R.

AU - Nagaosa, N.

AU - Hwang, H. Y.

AU - Tokura, Y.

AU - Ishizaka, K.

PY - 2013/3/7

Y1 - 2013/3/7

N2 - 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.

AB - 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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DO - 10.1103/PhysRevLett.110.107204

M3 - Article

SN - 0031-9007

VL - 110

JO - Physical Review Letters

JF - Physical Review Letters

IS - 10

M1 - 107204

ER -

Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors

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