  We report on acoustically driven spin resonances in atomic-scale centers in
silicon carbide at room temperature. Specifically, we use a surface acoustic
wave cavity to selectively address spin transitions with magnetic quantum
number differences of $\pm$1 and $\pm$2 in the absence of external microwave
electromagnetic fields. These spin-acoustic resonances reveal a non-trivial
dependence on the static magnetic field orientation, which is attributed to the
intrinsic symmetry of the acoustic fields combined with the peculiar properties
of a half-integer spin system. We develop a microscopic model of the
spin-acoustic interaction, which describes our experimental data without
fitting parameters. Furthermore, we predict that traveling surface waves lead
to a chiral spin-acoustic resonance, which changes upon magnetic field
inversion. These results establish silicon carbide as a highly-promising hybrid
platform for on-chip spin-optomechanical quantum control enabling engineered
interactions at room temperature.
