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Atomic Scale Control and Visualization of Topological Quantum Phase Transition in π-Conjugated Polymers Driven by Their Length
Advanced Materials ( IF 29.4 ) Pub Date : 2021-09-18 , DOI: 10.1002/adma.202104495
Héctor González-Herrero 1 , Jesús I Mendieta-Moreno 2 , Shayan Edalatmanesh 1, 2 , José Santos 3, 4 , Nazario Martín 3, 4 , David Écija 4 , Bruno de la Torre 1, 2 , Pavel Jelinek 1, 2
Affiliation  

Quantum phase transitions (QPTs) driven by quantum fluctuations are transitions between distinct quantum phases of matter. At present, they are poorly understood and not readily controlled. Here, scanning tunneling microscopy (STM) and noncontact atomic force microscopy (nc-AFM) are used to explore atomic scale control over quantum phase transitions between two different topological quantum states of a well-defined π-conjugated polymer. The phase transition is driven by a pseudo Jahn–Teller effect that is activated above a certain polymer chain length. In addition, theoretical calculations indicate the presence of long-lasting coherent fluctuations between the polymer's two quantum phases near the phase transition, at finite temperature. This work thus presents a new way of exploring atomic-scale control over QPTs and indicates that emerging quantum criticality in the vicinity of a QPT can give rise to new states of organic matter.

中文翻译:

π-共轭聚合物中由其长度驱动的拓扑量子相变的原子尺度控制和可视化

由量子涨落驱动的量子相变 (QPT) 是物质不同量子相之间的跃迁。目前,人们对它们知之甚少,也不容易控制。在这里,扫描隧道显微镜 (STM) 和非接触式原子力显微镜 (nc-AFM) 用于探索对明确定义的 π 共轭聚合物的两种不同拓扑量子态之间的量子相变的原子尺度控制。相变由伪 Jahn-Teller 效应驱动,该效应在特定聚合物链长度以上被激活。此外,理论计算表明,在有限温度下,相变附近聚合物的两个量子相之间存在持久的相干波动。
更新日期:2021-11-01
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