STM Imaging of Electronic Waves on the Surface of Bi2Te3: Topologically Protected Surface States and Hexagonal Warping Effects
STM Imaging of Electronic Waves on the Surface of Bi2Te3: Topologically Protected Surface States and Hexagonal Warping Effects
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DOI：
10.1103/physrevlett.104.016401
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发表时间：
2010-01-08
影响因子：
8.6
通讯作者：
Kapitulnik, A.
中科院分区：
文献类型：
--
作者：
Alpichshev, Zhanybek;Analytis, J. G.;Kapitulnik, A.
对高质量 Bi2Te3 晶体的扫描隧道光谱研究表现出与角度分辨光电子能谱数据的完美对应，因此能够识别在局部态密度 (LDOS) 中测量的不同状态。分析了台阶附近 LDOS 的振荡。在表面带的主要部分内，振荡被强烈阻尼，支持拓扑保护的假设。在较高能量下，当表面带变得凹时，会出现振荡，并以可能由六边形扭曲项产生的波矢量分散。
Scanning tunneling spectroscopy studies on high-quality Bi2Te3 crystals exhibit perfect correspondence to angle-resolved photoemission spectroscopy data, hence enabling identification of different regimes measured in the local density of states (LDOS). Oscillations of LDOS near a step are analyzed. Within the main part of the surface band oscillations are strongly damped, supporting the hypothesis of topological protection. At higher energies, as the surface band becomes concave, oscillations appear, dispersing with a wave vector that may result from a hexagonal warping term.