Liu Qiaomei, Wu Dong, Wu Tianyi, Han Shanshan, Peng Yiran, Yuan Zhihong, Cheng Yihan, Li Bohan, Hu Tianchen, Yue Li, Xu Shuxiang, Ding Ruoxuan, Lu Ming, Li Rongsheng, Zhang Sijie, Lv Baiqing, Zong Alfred, Su Yifan, Gedik Nuh, Yin Zhiping, Dong Tao, Wang Nanlin
International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China.
Beijing Academy of Quantum Information Sciences, Beijing, 100913, China.
Nat Commun. 2024 Oct 16;15(1):8937. doi: 10.1038/s41467-024-53323-0.
Utilizing ultrafast light-matter interaction to manipulate electronic states of quantum materials is an emerging area of research in condensed matter physics. It has significant implications for the development of future ultrafast electronic devices. However, the ability to induce long-lasting metastable electronic states in a fully reversible manner is a long-standing challenge. Here, by using ultrafast laser excitations, we demonstrate the capability to manipulate the electronic polar states in the charge-density-wave material EuTe in a non-volatile manner. The process is completely reversible and is achieved at room temperature with an all-optical approach. Each induced non-volatile state brings about modifications to the electrical resistance and second harmonic generation intensity. The results point to layer-specific phase inversion dynamics by which photoexcitation mediates the stacking polar order of the system. Our findings extend the scope of non-volatile all-optical control of electronic states to ambient conditions, and highlight a distinct role of layer-dependent phase manipulation in quasi-two-dimensional systems with inherent sublayer stacking orders.
利用超快光与物质相互作用来操纵量子材料的电子态是凝聚态物理中一个新兴的研究领域。它对未来超快电子器件的发展具有重要意义。然而，以完全可逆的方式诱导持久的亚稳电子态的能力是一个长期存在的挑战。在此，通过使用超快激光激发，我们展示了以非易失性方式操纵电荷密度波材料EuTe中电子极化态的能力。该过程是完全可逆的，并且在室温下通过全光学方法实现。每个诱导的非易失性状态都会引起电阻和二次谐波产生强度的变化。结果表明了层特异性的相反转动力学，通过这种动力学，光激发介导了系统的堆叠极性顺序。我们的发现将电子态的非易失性全光学控制范围扩展到了环境条件，并突出了层依赖相操纵在具有固有子层堆叠顺序的准二维系统中的独特作用。
