材料科学
凝聚态物理
介观物理学
各向异性
相变
金属-绝缘体过渡
纳米尺度
化学物理
金属
纳米技术
光学
物理
冶金
作者
M. K. Liu,Martin Wagner,Elsa Abreu,Salinporn Kittiwatanakul,Alexander McLeod,Zhe Fei,Michael Goldflam,Siyan Dai,M. M. Fogler,Jiwei Lu,Stuart A. Wolf,R. D. Averitt,D. N. Basov
标识
DOI:10.1103/physrevlett.111.096602
摘要
We resolved the enigma of anisotropic electronic transport in strained vanadium dioxide (VO2) films by inquiring into the role that strain plays in the nanoscale phase separation in the vicinity of the insulator-to-metal transition. The root source of the anisotropy was visualized as the formation of a peculiar unidirectional stripe state which accompanies the phase transition. Furthermore, nanoscale infrared spectroscopy unveils distinct facets of electron-lattice interplay at three different stages of the phase transition. These stages include the initial formation of sparse nonpercolating metallic domains without noticeable involvement of the lattice followed by an electron-lattice coupled anisotropic stripe state close to percolation which ultimately evolves into a nearly isotropic rutile metallic phase. Our results provide a unique mesoscopic perspective for the tunable macroscopic phenomena in strained metal oxide films.
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