The electronic structure of clean and adsorbate-covered Bi2Se3: an angle-resolved photoemission study

被引：44

作者：

Bianchi, Marco ^{[1
]}

Hatch, Richard C. ^{[1
]}

Guan, Dandan ^{[1
]}

Planke, Tilo ^{[1
]}

Mi, Jianli ^{[2
]}

Iversen, Bo Brummerstedt ^{[2
]}

Hofmann, Philip ^{[1
]}

机构：

[1] Aarhus Univ, Dept Phys & Astron, Interdisciplinary Nanosci Ctr, DK-8000 Aarhus, Denmark

[2] Aarhus Univ, Dept Chem, Ctr Mat Crystallog, Interdisciplinary Nanosci Ctr, DK-8000 Aarhus, Denmark

来源：

SEMICONDUCTOR SCIENCE AND TECHNOLOGY | 2012年 / 27卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

QUANTUM SPIN HALL; SINGLE DIRAC CONE; TOPOLOGICAL-INSULATOR; SURFACE-STATES; GAS; BISMUTH; BI2TE3; MODEL;

D O I：

10.1088/0268-1242/27/12/124001

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Angle-resolved photoelectron spectroscopy is used for a detailed study of the electronic structure of the topological insulator Bi2Se3. Nominally stoichiometric and calcium-doped samples were investigated. The pristine surface shows the topological surface state in the bulk band gap. As time passes, the Dirac point moves to higher binding energies, indicating an increasingly strong downward bending of the bands near the surface. This time-dependent band bending is related to a contamination of the surface and can be accelerated by intentionally exposing the surface to carbon monoxide and other species. For a sufficiently strong band bending, additional states appear at the Fermi level. These are interpreted as quantized conduction band states. For large band bendings, these states are found to undergo a strong Rashba splitting. The formation of quantum well states is also observed for the valence band states. Different interpretations of similar data are also discussed.

引用

页数：14

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