具有二维贵金属-有机蜂窝-Kagome能带结构的拓扑绝缘子的电子性质的解构,The Journal of Physical Chemistry C

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具有二维贵金属-有机蜂窝-Kagome能带结构的拓扑绝缘子的电子性质的解构
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-08-02 , DOI: 10.1021/acs.jpcc.8b03353
Hao Sun , Shijing Tan ₁ , Min Feng ₁ , Jin Zhao ₁ , Hrvoje Petek ₁

Affiliation

据预测，具有强自旋轨道耦合（SOC）的某些金属有机（MO）晶格可充当二维拓扑绝缘体（2D-TIs）。在自旋电子学技术中，如果采用绝缘的2D MO片，则在2D-TI中具有相反的电子自旋的金属边缘态的极化非常有趣。但是，MO晶格的2D-TI特性尚未得到实验证实。主要挑战在于，MO晶格通常会在金属基材上自组织，这会引入相互作用，从而改变甚至抑制拓扑特征。我们计算了由贵金属原子顶点和二齿1,4-亚苯基二异氰化物（PDI）接头组成的2D金属-有机蜂窝晶格的拓扑特性，这些拓扑结构形成了金属-有机蜂窝-Kagome晶格（MOHKLs）能带结构，自由和在金属基底上。顶点和链接器的选择可以独立地调整SOC和传输属性。计算预测，无支撑的2D MOHKL确实在SOC的Dirac谱带之间具有SOC诱导的间隙。K点。此外，这种MOHKL的纳米带经计算具有金属自旋极化边缘态。但是，在金属基板上支撑MOHKL会引入电势，从而产生Rashba SOC，这会缩小带隙。通过扫描隧道显微镜和光谱法进行的分子分辨测量测试了自组装在Ag（111）表面上的Ag-PDI MOHKL的电子性能，但没有发现2D-TI电子能带结构的证据。从衬底的电子和化学影响中释放MOHKL来保持其TI特性仍然是一个挑战。Rashba SOC提供了用于设计2D-TI带结构的附加工具。

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Deconstruction of the Electronic Properties of a Topological Insulator with a Two-Dimensional Noble Metal–Organic Honeycomb–Kagome Band Structure

Some metal–organic (MO) lattices with a strong spin–orbit coupling (SOC) have been predicted to behave as two-dimensional topological insulators (2D-TIs). The polarization of metallic edge states with the opposite electron spin in 2D-TIs, in otherwise insulating 2D MO sheets, is interesting for spintronic technology. The 2D-TI character of MO lattices, however, has not been confirmed by experiment. The main challenge has been that MO lattices usually self-organize on metal substrates, which can introduce interactions that modify and can even suppress the topological character. We calculate the topological properties of 2D metal–organic honeycomb lattice composed of noble metal atom vertices and bidentate 1,4-phenylene diisocyanide (PDI) linkers, which form metal–organic honeycomb–Kagome lattices (MOHKLs) band structure, free and on metal substrates. The selection of vertices and linkers can independently tune the SOC and transport properties. Calculations predict that unsupported 2D MOHKLs indeed possess SOC-induced gaps between the Dirac bands at the K-points. Furthermore, nanoribbons of such MOHKLs are calculated to possess metallic spin-polarized edge states. Supporting MOHKLs on a metal substrate, however, introduces an electric potential, giving rise to Rashba SOC, which can collapse the band gaps. Molecule-resolved measurements by scanning tunneling microscopy and spectroscopy test the electronic properties of Ag–PDI MOHKL self-assembled on Ag(111) surface, but find no evidence of the 2D-TI electronic band structure. Releasing MOHKLs from the electronic and chemical influences of substrates to preserve their TI properties remains a challenge. The Rashba SOC provides an additional tool for designing 2D-TI band structures.

更新日期：2018-08-02

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