Pressure-induced color change arising from transformation between intra-and inter-band transitions in LuH_(2±x)N_(y)  

作　　者：Zhe Liu Yingjie Zhang Shenyang Huang Xue Ming Qing Li Chenghao Pan Yaomin Dai Xiaoxiang Zhou Xiyu Zhu Hugen Yan Hai-Hu Wen 

机构地区：[1]Center for Superconducting Physics and Materials,National Laboratory of Solid State Microstructures and Department of Physics,National Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]State Key Laboratory of Surface Physics,Key Laboratory of Micro and Nano-Photonic Structures of the Ministry of Education,Department of Physics,Fudan University,Shanghai 200433,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第2期161-166,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key R&D Program of China(Grant Nos.2022YFA1403201,and 2022YFA1404700);the National Natural Science Foundation of China(Grant Nos.12174180,12074085,12204231,and 12061131001);the Fundamental Research Funds for the Central Universities(Grant No.020414380095);the Jiangsu Shuangchuang Program。

摘　　要：The pressure-induced color change in the nitrogen-doped lutetium hydride has triggered extensive discussions about the underlying physics and potential applications.Here,we study the optical response of LuH_(2±x)N_(y)in a broad frequency range at ambient pressure and its evolution with pressure in the visible spectral range.The broad-band optical spectra at ambient pressure reveal a Drude component associated with intra-band electronic transitions and two Lorentz components(L1 and L2)arising from inter-band electronic transitions.The application of pressure causes a spectral weight transfer from L1 to the Drude component,leading to a blue shift of the plasma edge in the reflectivity spectrum alongside a reduction of the high-frequency reflectivity.Our results suggest that the pressure-induced color change in LuH_(2±x)N_(y)is closely related to the transformation between intra-and inter-band electronic transitions,providing new insights into the mechanism of the pressure-induced color change in LuH_(2±x)N_(y).

关 键 词：nitrogen-doped lutetium hydride optical spectroscopy high-pressure technique color change 

分 类 号：O469[理学—凝聚态物理]