Multiple Coexisting Dirac Surface States in Three-Dimensional Topological Insulator PbBi6Te10

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• 作者：Marco Papagno ; Sergey V. Eremeev ; Jun Fujii ; Ziya S. Aliev ; Mahammad B. Babanly ; Sanjoy Kr. Mahatha ; Ivana Vobornik ; Nazim T. Mamedov ; Daniela Pacilé ; Evgueni V. Chulkov
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：March 22, 2016
• 年：2016
• 卷：10
• 期：3
• 页码：3518-3524
• 全文大小：500K
• ISSN：1936-086X

文摘

By means of angle-resolved photoemission spectroscopy (ARPES) measurements, we unveil the electronic band structure of three-dimensional PbBi₆Te₁₀ topological insulator. ARPES investigations evidence multiple coexisting Dirac surface states at the zone-center of the reciprocal space, displaying distinct electronic band dispersion, different constant energy contours, and Dirac point energies. We also provide evidence of Rashba-like split states close to the Fermi level, and deeper M- and V-shaped bands coexisting with the topological surface states. The experimental findings are in agreement with scanning tunneling microscopy measurements revealing different surface terminations according to the crystal structure of PbBi₆Te₁₀. Our experimental results are supported by density functional theory calculations predicting multiple topological surface states according to different surface cleavage planes.