Organic Monolayer Protected Topological Surface State

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• 作者：Hung-Hsiang Yang ; Yu-Hsun Chu ; Chun-I Lu ; Christopher John Butler ; Raman Sankar ; Fang-Cheng Chou ; Minn-Tsong Lin
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6896-6900
• 全文大小：392K
• ISSN：1530-6992

文摘

Perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA)/Bi₂Se₃ and Fe/PTCDA/Bi₂Se₃ heterointerfaces are investigated using scanning tunneling microscopy and spectroscopy. The close-packed self-assembled PTCDA monolayer possesses big molecular band gap and weak molecule鈥搒ubstrate interactions, which leaves the Bi₂Se₃ topological surface state intact under PTCDA. Formation of Fe-PTCDA hybrids removes interactions between the Fe dopant and the Bi₂Se₃ surface, such as doping effects and Coulomb scattering. Our findings reveal the functionality of PTCDA to prevent dopant disturbances in the TSS and provide an effective alternative for interface designs of realistic TI devices.