VO2 nanosheets: controlling the THz properties through strain engineering
Abreu, Elsa · Liu, Mengkun · Lu, Jiwei · West, Kevin G. · Kittiwatanakul, Salinporn · Yin, Wenjing · Wolf, Stuart A. · Averitt, Richard D.
Original · EN
We investigate far-infrared properties of strain engineered vanadium dioxide nanosheets through epitaxial growth on a (100)R TiO2 substrate. The nanosheets exhibit large uniaxial strain leading to highly uniform and oriented cracks along the rutile c-axis. Dramatic anisotropy arises for both the metal-insulator transition temperature, which is different from the structural transition temperature along the cR axis, and the metallic state conductivity. Detailed analysis reveals a Mott-Hubbard like behavior along the rutile cR axis.
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