• Acta Physica Sinica
  • Vol. 68, Issue 10, 107201-1 (2019)
Xiao-Ning Sun, Zhao-Ming Qu*, Qing-Guo Wang, Yang Yuan, and Shang-He Liu*
DOI: 10.7498/aps.68.20190136 Cite this Article
Xiao-Ning Sun, Zhao-Ming Qu, Qing-Guo Wang, Yang Yuan, Shang-He Liu. Research progress of metal-insulator phase transition in VO2 induced by electric field [J]. Acta Physica Sinica, 2019, 68(10): 107201-1 Copy Citation Text show less

Abstract

Vanadium dioxide (VO2) is a typical representative of strongly correlated electronic systems, which undergoes a reversible transition from the insulator phase to metal phase, induced by a certain threshold for each of temperature, electric field, illumination and pressure. The crystal structure of VO2 will undergo a reversible transition from monoclinic structure to tetragonal rutile structure when the phase transition happens, which is considered as the microscopic mechanism of VO2 metal-insulator transition (MIT). The conductivity of VO2 can be increased by 2—5 orders of magnitude when the MIT is induced by electric field, which makes VO2 possess good application prospects in the fields of restructurable slot antenna, terahertz radiation, intelligent electromagnetic protection materials, etc. Therefore, the reversible metal-insulator phase transition in VO2, induced by electric field, has long been a research hotspot, which however, has been seldom reported. Firstly, in this paper, the changes of the crystal structure and energy band structure of VO2 during MIT are introduced briefly. The methods of regulating the phase transition are given, including temperature control, bandwidth and band-filling control. Then, the important discovery and research progress of VO2 MIT induced by electric field based on the research method, response time, critical threshold field and phase transition mechanism are summarized and reviewed comprehensively. The method of studying the VO2 phase transition relates to its structure, including planar structure, three-terminal gated eld effect switch and sandwiched layer structure. The sandwich layer structure is more suitable for investigating the MIT characteristics of VO2 in experimental stage because of its structural advantage of preparation and test. The response time of VO2 MIT can be completed in nanoseconds, of which the substantial parameter has been revealed by many reports, also including the excellent reversibility of VO2 MIT. The MIT critical threshold field of the VO2 film can be tuned by element doping, coexistence of multivalent vanadium oxides and multiple physical field synergism effectively. The MIT mechanism of VO2 induced by electric field has been proposed so far, which includes joule heating mechanism and pure electric field mechanism, and the latter is considered to be more likely to give a reasonable explanation. Finally, in the paper the current problems of the VO2 MIT research and the near-future development direction of the VO2 MIT materials are also pointed out.
Xiao-Ning Sun, Zhao-Ming Qu, Qing-Guo Wang, Yang Yuan, Shang-He Liu. Research progress of metal-insulator phase transition in VO2 induced by electric field [J]. Acta Physica Sinica, 2019, 68(10): 107201-1
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