Liu Ruxin, Si Liang, Niu Wei, Zhang Xu, Chen Zhongqiang, Zhu Changzheng, Zhuang Wenzhuo, Chen Yongda, Zhou Liqi, Zhang Chunchen, Wang Peng, Song Fengqi, Tang Lin, Xu Yongbing, Zhong Zhicheng, Zhang Rong, Wang Xuefeng
Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
School of Physics, Northwest University, Xi'an, 710127, China.
Adv Mater. 2023 Mar;35(12):e2211612. doi: 10.1002/adma.202211612. Epub 2023 Feb 13.
Light control of emergent quantum phenomena is a widely used external stimulus for quantum materials. Generally, perovskite strontium ruthenate SrRuO has an itinerant ferromagnetism with a low-spin state. However, the phase of intermediate-spin (IS) ferromagnetic metallic state has never been seen. Here, by means of UV-light irradiation, a photocarrier-doping-induced Mott-insulator-to-metal phase transition is shown in a few atomic layers of perovskite IS ferromagnetic SrRuO . This new metastable IS metallic phase can be reversibly regulated due to the convenient photocharge transfer from SrTiO substrates to SrRuO ultrathin films. These dynamical mean-field theory calculations further verify such photoinduced electronic phase transformation, owing to oxygen vacancies and orbital reconstruction. The optical manipulation of charge-transfer finesse is an alternative pathway toward discovering novel metastable phases in strongly correlated systems and facilitates potential light-controlled device applications in optoelectronics and spintronics.
对新兴量子现象的光控制是量子材料广泛使用的外部刺激手段。一般来说，钙钛矿钌酸锶（SrRuO）具有低自旋态的巡游铁磁性。然而，从未见过中间自旋（IS）铁磁金属态的相。在此，通过紫外线照射，在几原子层的钙钛矿IS铁磁SrRuO中展示了光载流子掺杂诱导的莫特绝缘体到金属的相变。由于光电荷从SrTiO衬底方便地转移到SrRuO超薄膜，这种新的亚稳IS金属相可以被可逆地调控。这些动态平均场理论计算进一步证实了这种光致电子相变，这是由于氧空位和轨道重构所致。电荷转移精细度的光学操纵是在强关联系统中发现新型亚稳相的另一条途径，并促进了光电子学和自旋电子学中潜在的光控器件应用。
