Spectroscopic visualization and phase manipulation of chiral charge density waves in 1T-TaS(2).

Spectroscopic visualization and phase manipulation of chiral charge density waves in 1T-TaS(2).
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DOI:
10.1038/s41467-023-37927-6
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发表时间:
2023-04-19
影响因子:
16.6
通讯作者:
Zhang, Jin
Zhang, Jin
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhao, Yan;Nie, Zhengwei;Hong, Hao;Qiu, Xia;Han, Shiyi;Yu, Yue;Liu, Mengxi;Qiu, Xiaohui;Liu, Kaihui;Meng, Sheng;Tong, Lianming;Zhang, Jin

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手征电荷密度波是凝聚态物质中的一种多体集体现象,可能在非常规超导和拓扑物理中发挥作用。二维手征电荷密度波为各种堆叠结构和手征同质结构的制造提供了基础,其中可以出现诸如手征电流和反常霍尔效应等物理性质。在这里,我们展示了二维手性电荷密度波的相位操纵和1 T-TaS 2中面内手性同质结构的设计。我们使用手性拉曼光谱直接监测的手性开关的电荷密度波揭示了温度介导的可逆的手性开关。我们发现层间堆积有利于同手性构型,这一点得到了第一性原理计算的证实。通过利用层间手性锁定效应,我们实现了1 T-TaS 2的面内手性同质结构。我们的结果提供了一个通用的方法来操纵手性集体相层间耦合在层状货车德瓦尔斯半导体。层状半导体中的二维电荷密度波可能表现出手征性。在这里,作者利用热退火可逆地切换在1 T-TaS 2中的电荷密度波的面内手性,并证明了货车德瓦尔斯堆叠层之间的垂直手性锁定效应。
The chiral charge density wave is a many-body collective phenomenon in condensed matter that may play a role in unconventional superconductivity and topological physics. Two-dimensional chiral charge density waves provide the building blocks for the fabrication of various stacking structures and chiral homostructures, in which physical properties such as chiral currents and the anomalous Hall effect may emerge. Here, we demonstrate the phase manipulation of two-dimensional chiral charge density waves and the design of in-plane chiral homostructures in 1T-TaS2. We use chiral Raman spectroscopy to directly monitor the chirality switching of the charge density wave—revealing a temperature-mediated reversible chirality switching. We find that interlayer stacking favours homochirality configurations, which is confirmed by first-principles calculations. By exploiting the interlayer chirality-locking effect, we realise in-plane chiral homostructures in 1T-TaS2. Our results provide a versatile way to manipulate chiral collective phases by interlayer coupling in layered van der Waals semiconductors. Two-dimensional charge density waves in layered semiconductors may exhibit chirality. Here, the authors utilize thermal annealing to reversibly switch the in-plane chirality of charge density waves in 1T-TaS2 and demonstrate a vertical chirality-locking effect between the van der Waals-stacked layers.
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