Charge
density wave phase comprises a periodic modulation of the
electronic charge density with a periodic distortion of the atomic
lattice, and transition-metal dichalcogenides are very important subjects
for the study of this distortion. In this work, large-area 1T′-vanadium
telluride (VTe2) films grown by molecular beam epitaxy
show the charge density wave order down to the few-layer limit. The
film thickness was found to be strongly correlated with the out-of-plane
vibration mode shifting from Raman scattering, and increasing film
thickness leads to an insulating-metallic transition. We demonstrate
a charge density wave phase transition at 175 K for 2 (ML) films and
multiple phase transitions in films more than 5 ML. It was also found
that the transition was accompanied with a strong out-of-plane distortion.
These findings open up a new window for the search and control of
collective phases of two-dimensional VTe2 films.
C–H bond activation and dehydrogenative coupling reactions have always been significant approaches to construct microscopic nanostructures on surfaces. By using scanning tunneling microscopy/spectroscopy (STM/STS) and non-contact atomic force microscopy (nc-AFM)...
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