  Antimonene -- a single layer of antimony atoms -- and its few layer forms are
among the latest additions to the 2D mono-elemental materials family. Numerous
predictions and experimental evidence of its remarkable properties including
(opto)electronic, energetic or biomedical, among others, together with its
robustness under ambient conditions, have attracted the attention of the
scientific community. However, experimental evidence of its electrical
properties is still lacking. Here, we characterized the electronic properties
of mechanically exfoliated flakes of few-layer (FL) antimonene of different
thicknesses (~ 2-40 nm) through photoemission electron microscopy, kelvin probe
force microscopy and transport measurements, which allows us to estimate a
sheet resistance of ~ 1200 $\Omega$sq$^{-1}$ and a mobility of ~ 150
cm$^2$V$^{-1}$s$^{-1}$ in ambient conditions, independent of the flake
thickness. Alternatively, our theoretical calculations indicate that
topologically protected surface states (TPSS) should play a key role in the
electronic properties of FL antimonene, which supports our experimental
findings. We anticipate our work will trigger further experimental studies on
TPSS in FL antimonene thanks to its simple structure and significant stability
in ambient environments.
