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The Weyl semimetal WTe2 and MoTe2 show great potential in generating largespin currents since they possess topologically-protected spin-polarized statesand can carry a very large current density. In addition, the intrinsicnoncentrosymmetry of WTe2 and MoTe2 endows with a unique property of crystalsymmetry-controlled spin-orbit torques. An important question to be answeredfor developing spintronic devices is how spins relax in WTe2 and MoTe2. Here,we report a room-temperature spin relaxation time of 1.2 ns (0.4 ns) in WTe2(MoTe2) thin film using the time-resolved Kerr rotation (TRKR). Based on abinitio calculation, we identify a mechanism of long-lived spin polarizationresulting from a large spin splitting around the bottom of the conduction band,low electron-hole recombination rate and suppression of backscattering requiredby time-reversal and lattice symmetry operation. In addition, we find the spinpolarization is firmly pinned along the strong internal out-of-plane magneticfield induced by large spin splitting. Our work provides an insight into thephysical origin of long-lived spin polarization in Weyl semimetals which couldbe useful to manipulate spins for a long time at room temperature.

Room-temperature nanoseconds spin relaxation in WTe2 and MoTe2 thin films