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

被引：163

作者：

Sakano, M. ^{[1
]}

Bahramy, M. S. ^{[2
]}

Katayama, A. ^{[1
]}

Shimojima, T. ^{[1
]}

Murakawa, H. ^{[2
]}

Kaneko, Y. ^{[2
,4
]}

Malaeb, W. ^{[3
,4
]}

Shin, S. ^{[3
]}

Ono, K. ^{[5
]}

Kumigashira, H. ^{[5
]}

Arita, R. ^{[1
,2
]}

Nagaosa, N. ^{[1
,2
]}

Hwang, H. Y. ^{[2
,7
,8
]}

Tokura, Y. ^{[1
,2
]}

Ishizaka, K. ^{[1
,6
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] RIKEN, Adv Sci Inst, CERG, Wako, Saitama 3510198, Japan

[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2278581, Japan

[4] JST, CREST, Tokyo 1020075, Japan

[5] High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[6] PRESTO, JST, Kawaguchi, Saitama 3320012, Japan

[7] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[8] Stanford Univ, Stanford Inst Mat & Energy Sci, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 10期

关键词：

LOCALIZED WANNIER FUNCTIONS; SRTIO3; BITEI; PLANE;

D O I：

10.1103/PhysRevLett.110.107204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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. DOI: 10.1103/PhysRevLett.110.107204

引用

页数：5