Solitonics with Polyacetylenes
Solitonics with Polyacetylenes
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DOI：
10.1021/acs.nanolett.0c00136
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发表时间：
2020-04-08
期刊：
影响因子：
10.8
通讯作者：
Evers, Ferdinand
中科院分区：
文献类型：
--
作者：
Hernangomez-Perez, Daniel;Gunasekaran, Suman;Evers, Ferdinand
聚乙炔分子线在过去的40年里引起了人们长期的兴趣。从基本的角度来看，这种兴趣主要有两个原因。首先，聚乙炔是一维拓扑绝缘体的主要实现。其次，长分子支持自由传播的拓扑畴壁态，即所谓的“孤子”，这为自旋电荷分离提供了早期范例。由于最近的实验进展，现在可以在底物上合成单独的聚乙炔链。在这一突破的激励下，我们在这里提出了一种在这些系统中设计化学支持孤子的新方法。我们演示了如何控制孤子位置以及如何通过外部手段读出它。此外，我们还展示了在施加中等静电场时如何产生额外的孤子-反孤子对。因此，我们向基于孤子操作的电子设备功能迈出了一步，即“孤子学”。
Polyacetylene molecular wires have attracted a long-standing interest for the past 40 years. From a fundamental perspective, there are two main reasons for the interest. First, polyacetylenes are a prime realization of a one-dimensional topological insulator. Second, long molecules support freely propagating topological domain-wall states, so-called "solitons," which provide an early paradigm for spin-charge separation. Because of recent experimental developments, individual poly- acetylene chains can now be synthesized on substrates. Motivated by this breakthrough, we here propose a novel way for chemically supported soliton design in these systems. We demonstrate how to control the soliton position and how to read it out via external means. Also, we show how extra soliton-antisoliton pairs arise when applying a moderate static electric field. We thus make a step toward functionality of electronic devices based on soliton manipulation, that is, "solitonics".