Electronic structure for a topological insulator with a smoothly varying step on surface》.pdfVIP

Electronic structure for a topological insulator with a smoothly varying step on surface》.pdf

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Electronic structure for a topological insulator with a smoothly varying step on surface》.pdf

Physica B 454 (2014) 67–71 Contents lists available at ScienceDirect Physica B journal homepage: /locate/physb Electronic structure for a topological insulator with a smoothly varying step on surface Ma Zhou, Yiman Liu, Huaihua Shao, Xiaoying Zhou, Guanghui Zhou n Department of Physics and Key Laboratory for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education), Hunan Normal University, Changsha 410081, China a r t i c l e i n f o a b s t r a c t Article history: We study the penetration depth (PD) of surface state into the bulk, the local density of states (LDOS) and Received 21 April 2014 the spin-polarized STM tip tunneling conductance (TG) for a smoothly varying step described by an Accepted 11 July 2014 asymptotic model, on the surface of a three-dimensional (3D) topological insulator (TI). Using curvilinear Available online 27 July 2014 coordinates for calculation, we find that the PD shows two peaks near step edges with maximum surface Keywords: curvature and a dip value of flat surface at step middle with zero curvature. In contrast, the LDOS 3D topological insulators exhibits a double valley (dip) pattern, in which it rapidly declines from the highest value for flat surface Step defects to the dip value near step edges, and then shows a small peak at step middle. This interesting small peak Surface electronic structure

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