保持拓扑表面状态：Bi2Se3上的FePc
Preserving the topological surface state: FePc on Bi2Se3
摘要：
利用扫描隧道显微镜（STM）和光谱学（STS）研究了77 K超高真空下铁酞菁（FePc）分子在拓扑绝缘体Bi2Se3表面的生长.亚分子分辨率STM图像提供了原子尺度的注册表的分子的吸附位点，在顶部或桥梁，参考的Bi2Se3表面的顶面硒原子。STS数据揭示了FePc分子的HOMO和LUMO轨道相对于特异性结合位点的轻微移动。STS测量结果表明，Bi_2Se_3的狄拉克点在沉积FePc分子后没有发生变化。这表明拓扑绝缘体表面状态（TISS）的保护。我们推测，虽然Fe原子具有磁性，但在Pc环中连接到Fe的配体影响吸附在Bi2Se3衬底上的分子的磁性行为。我们的工作提出了一个例子，以推进调整TISS接口与不同的分子和设计的表面和接口与时间反转对称性保护的磁性纹理的战略平台。
英文摘要：
Iron phthalocyanine (FePc) molecules were investigated on the topological insulator surface Bi2Se3 using scanning tunneling microscopy (STM) and spectroscopy (STS) at 77 K in ultra high vacuum (UHV). Sub-molecular resolution STM images provide the atomic scale registry of the adsorption site of the molecules, on-top or bridge, with reference to the top surface Se atoms of the Bi2Se3 surface. STS data reveal a slight shift in the HOMO and LUMO orbitals of the FePc molecules with respect to the specific binding site. Close to Fermi energy the STS measurements show that the Dirac point of Bi2Se3 remains unchanged after depositing FePc molecules. This is indicative of the protection of the topological insulator surface state (TISS). We speculate that though the Fe atom has magnetic properties, the ligands attached to Fe in the Pc ring influence the magnetic behavior of the molecule upon adsorption on the Bi2Se3 substrate. Our work puts forth an example to advance the strategic platform for tuning the TISS interfaces with different molecules and for designing surfaces and interfaces with time reversal symmetry protected magnetic textures.
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