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Weyl Fermions (WFs) in the type-II Weyl Semimetal (WSM) WTe$_2$ are difficultto resolve experimentally because the Weyl bands disperse in an extremelynarrow region of the (E-k) space. Here, by using DFT-assisted high-resolution$^{125}$Te solid-state NMR (ssNMR) in the temperature range $50$K - $700$K, wesucceeded in detecting low energy WF excitations and monitor their evolutionwith temperature. Remarkably, WFs appear to emerge at T$\sim 120$K; at lowertemperatures WTe$_2$ behaves as a metal. This intriguing metal-to-WSM phasetransition is shown to be induced by the rapid raise of the Fermi level withtemperature, crossing solely the electron and hole pockets in the low-Tmetallic phase, while crossing the Weyl bands near the nodal points - aprerequisite for the emergence of WFs - only for T$>120$K.

Detection of Weyl Fermions and the Metal to Weyl-Semimetal phase transition in WTe$_2$ via broadband High Resolution NMR