Spin-orbit interaction effect in the electronic structure of Bi2Te3 observed by angle-resolved photoemission spectroscopy

被引：98

作者：

Noh, H. -J. ^{[1
,2
,3
]}

Koh, H. ^{[2
,3
]}

Oh, S. -J. ^{[2
,3
]}

Park, J. -H. ^{[4
]}

Kim, H. -D. ^{[5
]}

Rameau, J. D. ^{[6
,7
]}

Valla, T. ^{[6
]}

Kidd, T. E. ^{[6
]}

Johnson, P. D. ^{[6
]}

Hu, Y. ^{[6
]}

Li, Q. ^{[6
]}

机构：

[1] Chonnam Natl Univ, Dept Phys, Kwangju 500757, South Korea

[2] Seoul Natl Univ, Sch Phys, Seoul 151742, South Korea

[3] Seoul Natl Univ, Ctr Strongly Correlated Mat Res, Seoul 151742, South Korea

[4] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea

[5] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 790784, South Korea

[6] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[7] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11974 USA

来源：

EPL | 2008年 / 81卷 / 05期

关键词：

D O I：

10.1209/0295-5075/81/57006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electronic structure of p-type doped Bi2Te3 is studied by angle-resolved photoemission spectroscopy (ARPES) to experimentally confirm the mechanism responsible for the high thermoelectric figure of merit. Our ARPES study shows that the band edges are located off. the Gamma-Z line in the Brillouin zone, which provides direct observation that the spin-orbit interaction is a key factor to understand the electronic structure and the corresponding thermoelectric properties of Bi2Te3. A successive time-dependent ARPES measurement also reveals that the electron-like bands crossing E-F near the (Gamma) under bar -point are formed in an hour after cleaving the crystals. We interpret these as surface states induced by surface band bending, possibly due to quintuple inter-layer distance change of Bi2Te3. Copyright (c) EPLA, 2008.

引用

页数：5

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