Topological properties of matters have attracted tremendous interest in the past years due to the scientific and technological importance. It is of great interest to discover the analogs of topological phases in molecular architectures, if the key constituents of the phases are properly mimicked. Using scanning tunneling microscopy, we demonstrate that quasi-1D molecular chains assembled from conformation-switchable dibenzo[g,p]chrysene molecules show hidden antiparallel order analogous to the hidden antiferromagnetic order in the Haldane phase, a known topological phase of quantum spin-1 chains. This is realized by mimicking the spin degree of freedom with the intramolecular helicene chiral switches and by emulating the interspin antiferromagnetic coupling with intermolecular homochiral coupling. The discovery of the molecular analog of topological matters may inspire the search of molecular architectures with nontrivial topological properties.

中文翻译：

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由构象可转换分子组装的分子链中的隐藏顺序和类似哈丹烷的相。

由于科学和技术的重要性，物质的拓扑特性在过去几年中引起了极大的兴趣。如果适当模拟了相中的关键成分，那么在分子体系结构中发现拓扑相的类似物将引起极大的兴趣。使用扫描隧道显微镜，我们证明了从构象可转换的二苯并[ g，p] molecules分子在Haldane相（量子自旋1链的已知拓扑相）中表现出类似于隐藏的反铁磁顺序的隐藏的反平行顺序。这是通过模拟分子内螺旋手性开关的自旋自由度，并通过分子间同手性偶合模拟自旋间反铁磁耦合来实现的。拓扑物质分子类似物的发现可能会激发人们对具有非平凡拓扑特性的分子构架的探索。