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Atomic-scale visualization of chiral charge density wave superlattices and their reversible switching.

ABSTRACT: Chirality is essential for various phenomena in life and matter. However, chirality and its switching in electronic superlattices, such as charge density wave (CDW) superlattices, remain elusive. In this study, we characterize the chirality switching with atom-resolution imaging in a single-layer NbSe2 CDW superlattice by the technique of scanning tunneling microscopy. The atomic arrangement of the CDW superlattice is found continuous and intact although its chirality is switched. Several intermediate states are tracked by time-resolved imaging, revealing the fast and dynamic chirality transition. Importantly, the switching is reversibly realized with an external electric field. Our findings unveil the delicate switching process of chiral CDW superlattice in a two-dimensional (2D) crystal down to the atomic scale.

SUBMITTER: Song X 

PROVIDER: S-EPMC8983771 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature

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Atomic-scale visualization of chiral charge density wave superlattices and their reversible switching.

Song Xuan X   Liu Liwei L   Chen Yaoyao Y   Yang Han H   Huang Zeping Z   Hou Baofei B   Hou Yanhui Y   Han Xu X   Yang Huixia H   Zhang Quanzhen Q   Zhang Teng T   Zhou Jiadong J   Huang Yuan Y   Zhang Yu Y   Gao Hong-Jun HJ   Wang Yeliang Y  

Nature communications 20220405 1

Chirality is essential for various phenomena in life and matter. However, chirality and its switching in electronic superlattices, such as charge density wave (CDW) superlattices, remain elusive. In this study, we characterize the chirality switching with atom-resolution imaging in a single-layer NbSe<sub>2</sub> CDW superlattice by the technique of scanning tunneling microscopy. The atomic arrangement of the CDW superlattice is found continuous and intact although its chirality is switched. Sev  ...[more]

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