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Electric-field-driven phase transition in vanadium dioxide | | B. Wu
; A. Zimmers
; H. Aubin
; R. Ghosh
; Y. Liu
; R. Lopez
; | | Date: |
6 Jan 2012 | | Abstract: | We report on local probe measurements of current-voltage and electrostatic
force-voltage characteristics of electric-field-induced insulator to metal
transition in VO2 thin film. In conducting AFM mode, switching from the
insulating to metallic state occurs for electric-field threshold
E~6.5 imes10^7 Vm-1 at 300K. Upon lifting the tip above the sample surface, we
find that the transition can also be observed through a change in electrostatic
force and in tunneling current. In this noncontact regime, the transition is
characterized by random telegraphic noise. These results show that electric
field alone is sufficient to induce the transition; however, the electronic
current provides a positive feedback effect that amplifies the phenomena. | | Source: | arXiv, 1201.1459 | | Services: | Forum | Review | PDF | Favorites | |
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