  We carried out point contact (PC) investigation of WTe2 single crystals. We
measured Yanson d2V/dI2 PC spectra of the electron-phonon interaction (EPI) in
WTe2. The spectra demonstrate a main phonon peak around 8 meV and a shallow
second maximum near 16 meV. Their position is in line with the calculation of
the EPI spectra of WTe2 in the literature, albeit phonons with higher energy
are not resolved in our PC spectra. An additional contribution to the spectra
is present above the phonon energy, what may be connected with the peculiar
electronic band structure and need to be clarified. We detected tiny
superconducting features in d2V/dI2 close to zero bias, which broadens by
increasing temperature and blurs above 6K. Thus, (surface) superconductivity
may exist in WTe2 with a topologically nontrivial state. We found a broad
maximum in dV/dI at large voltages (>200 mV) indicating change of conductivity
from metallic to semiconducting type. The latter might be induced by the high
current density (~10^8 A/cm^2) in the PC and/or local heating, thus enabling
the manipulation of the quantum electronic states at the interface in the PC
core.
