Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
Phys Rev Lett. 2010 Jan 8;104(1):016401. doi: 10.1103/PhysRevLett.104.016401. Epub 2010 Jan 4.
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.
对高质量 Bi2Te3 晶体的扫描隧道谱研究与角分辨光电子能谱数据完全吻合，从而能够识别在局域态密度 (LDOS) 中测量的不同状态。分析了在台阶附近 LDOS 的振荡。在表面能带的主要部分，振荡被强烈阻尼，这支持了拓扑保护的假设。在更高的能量下，随着表面能带变得凹形，出现了色散的振荡，其波矢可能来自于六方扭曲项。
