由构象可切换分子组装的分子链中的隐藏有序和类霍尔丹相
Hidden Order and Haldane-Like Phase in Molecular Chains Assembled from Conformation-Switchable Molecules
作者:Jialiang Deng;Aidi Zhao;Ruiqi Zhang;Huan Shan;Bin Li;Jinlong Yang;Bing Wang;
关键词:scanning tunneling microscopy,molecular chain,molecular switch,aromatic coupling,topological order
DOI:https://doi.org/10.1021/acsnano.8b00146
发表时间:2018年
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摘要
由于科学和技术的重要性,物质的拓扑性质在过去几年引起了人们的极大兴趣。如果正确地模拟相的关键成分,那么发现分子结构中拓扑相的类似物是非常有趣的。使用扫描隧道显微镜,我们证明由构象可切换的二苯并[g,p]屈分子组装而成的准一维分子链显示出隐藏的反平行序,类似于霍尔丹相中隐藏的反铁磁序,霍尔丹相是量子自旋1的已知拓扑相链。这是通过用分子内螺旋烯手性开关模拟自旋自由度以及用分子间同手性耦合模拟自旋间反铁磁耦合来实现的。拓扑物质的分子类似物的发现可能会激发对具有重要拓扑特性的分子结构的搜索。
Abstract
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.
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