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- W3021925284 abstract "Through ${in~situ}$ photoemission spectroscopy, we investigated the change in the electronic and crystal structures of dimensionality-controlled VO$_2$ films coherently grown on TiO$_2$(001) substrates. In the nanostructured films, the balance between the instabilities of a bandlike Peierls transition and a Mott transition is controlled as a function of thickness. The characteristic spectral change associated with temperature-driven metal-insulator transition in VO$_2$ thick films holds down to 1.5 nm (roughly corresponding to five V atoms along the [001] direction), whereas VO$_2$ films of less than 1.0 nm exhibit insulating nature without V-V dimerization. These results suggest that the delicate balance between a Mott instability and a bandlike Peierls instability is modulated at a scale of a few nanometers by the dimensional crossover effects and confinement effects, which consequently induce the complicated electronic phase diagram of ultrathin VO$_2$ films." @default.
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- W3021925284 date "2020-09-09" @default.
- W3021925284 modified "2023-10-16" @default.
- W3021925284 title "Thickness dependence of electronic structures in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi mathvariant=normal>V</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> ultrathin films: Suppression of the cooperative Mott-Peierls transition" @default.
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- W3021925284 doi "https://doi.org/10.1103/physrevb.102.115114" @default.
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