| 초록 |
Vanadium dioxide (VO2) is a correlated electron material that undergoes a first-order metal-insulator phase transition (MIT), coupled with a structural phase transition from a high-temperature tetragonal rutile-type phase to a low-temperature monoclinic phase at the temperature of 340K. It is known that the MIT in VO2 can be driven by either strong electron-electron interaction (Mott transition), electron-phonon interaction (Peierls transition), or a combination of both mechanisms. Importantly, the MIT properties of the VO2 are significantly affected by stoichiometry, doping, size effect, defects, and in particular, strain. To effectively investigate those issues for applications of novel functional devices, the single-crystalline VO2 nanostructures can provide new opportunities to explore, understand, and ultimately engineer MIT properties. Here, we present the strain effect on the roles of thermal heating and electric field in the metal-insulator transition (MIT) of the VO2 nanobeams. |
