论文标题
手学电荷密度波状态及其可逆过渡的原子级可视化
Atomic-Scale Visualization of Chiral Charge Density Wave States and Their Reversible Transition
论文作者
论文摘要
手性对于生活和物质的各种惊人现象至关重要。但是，手性及其在电子超晶格中的切换（例如电荷密度波（CDW）阵列）仍然难以捉摸。在这项研究中，我们通过扫描隧道显微镜的技术来表征单层NBSE2 CDW模式中原子分辨率成像的手性转变。 CDW阵列的原子晶格是连续且完整的，尽管其手性得到了切换。通过时间分辨的成像跟踪几个中间状态，揭示了快速和动态的手性转变。重要的是，通过外部电场可以可逆地实现转换。我们的发现揭示了2D晶体中的手性CDW阵列的精致过渡过程，直至原子量表，可能适用于将来的纳米级设备。
Chirality is essential for various amazing phenomena in life and matter. However,chirality and its switching in electronic superlattices, such as charge density wave(CDW) arrays, remain elusive. In this study, we characterize the chirality transition with atom-resolution imaging in a single-layer NbSe2 CDW pattern by technique of scanning tunneling microscopy. The atomic lattice of the CDW array 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 transition process of chiral CDW array in a 2D crystal down to the atomic scale and may be applicable for future nanoscale devices.
