  The nonlinear Hall effect (NLHE), which can produce a transverse voltage
without any magnetic field, is a potential alternative for rectification or
frequency doubling. However, the low temperature detection of NLHE limits its
applications. Here, we report the room-temperature NLHE in a type-II Weyl
semimetal TaIrTe4, which hosts a robust NLHE due to substantial broken
inversion symmetry and large band overlapping at the Fermi level. We also
observe a temperature-induced sign inversion of NLHE in TaIrTe4. Our
theoretical calculations suggest that the observed sign inversion is a result
of temperature-induced shift in the chemical potential indicating a direct
correlation of NLHE with the electronic structure at the Fermi surface.
Finally, the room-temperature NLHE in TaIrTe4 is exploited to demonstrate the
wireless RF rectification with zero external bias and magnetic field. This work
opens a door to realizing room temperature applications based on the NLHE in
Weyl semimetals.
