Scholarlink

<p>Phase engineering is of vital importance for determining the material functionalities and expanding the material library. However, the controllable and scalable phase transition of transition metal chalcogenides remains extremely challenging. The microscopic observation of the phase evolution pathway is an essential prerequisite for understanding the phase transition mechanism. Here we atomically observe a non-stoichiometric phase evolution process in large-scale superconducting PdTe<sub>2</sub> films under heating through in situ scanning transmission electron microscopy. The unprecedented phase transition from PdTe<sub>2</sub> to PdTe via atomic reconstruction is evidenced and theoretically verified by our machine learning molecular dynamics simulations. In particular, forming the intermediate state of PdTe<sub>2</sub>/PdTe heterostructure during the phase transition robustly generates giant-helicity-dependent terahertz emission due to inversion symmetry breaking. Our results not only provide insights into the atomic reconstruction in transition metal chalcogenides but also offer a general strategy for the fabrication of large-area transition metal monochalcogenide films and heterostructures, potentially applicable for various device applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Large-area non-stoichiometric phase transition in transition metal chalcogenide films

  • 期刊论文

  • 发表日期：

    2026年1月16日

查看全文
  • Zhongqiang Chen,
  • Jin-an Shi,
  • Jianqi Huang,
  • Yuan Chang,
  • Ruijie Xu,
  • Kankan Xu,
  • Xu Zhang,
  • Xudong Liu,
  • Da Tian,
  • Yong Zhang,
  • Sajjad Ali,
  • Xingze Dai,
  • Gan Liu,
  • Zheng Dai,
  • Shuai Zhang,
  • Fucong Fei,
  • Xiaoxiang Xi,
  • Yufeng Hao,
  • Liang He,
  • Wu Zhou,
  • Teng Yang,
  • Junfeng Gao,
  • Feng Ding,
  • Yongbing Xu,
  • Fengqi Song,
  • Biaobing Jin,
  • Xinran Wang,
  • Yi Shi,
  • Rong Zhang,
  • Xuefeng Wang

摘要

Phase engineering is of vital importance for determining the material functionalities and expanding the material library. However, the controllable and scalable phase transition of transition metal chalcogenides remains extremely challenging. The microscopic observation of the phase evolution pathway is an essential prerequisite for understanding the phase transition mechanism. Here we atomically observe a non-stoichiometric phase evolution process in large-scale superconducting PdTe2 films under heating through in situ scanning transmission electron microscopy. The unprecedented phase transition from PdTe2 to PdTe via atomic reconstruction is evidenced and theoretically verified by our machine learning molecular dynamics simulations. In particular, forming the intermediate state of PdTe2/PdTe heterostructure during the phase transition robustly generates giant-helicity-dependent terahertz emission due to inversion symmetry breaking. Our results not only provide insights into the atomic reconstruction in transition metal chalcogenides but also offer a general strategy for the fabrication of large-area transition metal monochalcogenide films and heterostructures, potentially applicable for various device applications.