Spectral gap for powers of a positive line bundle (${\Delta }_{L^k}^{0,q}\ge \epsilon k(q\ge 1)$)

For a positive Hermitian holomorphic line bundle on compact $X$, using its curvature as the Kähler form, a linear lower bound in $k$ for the full Dolbeault Laplacian on positive antiholomorphic degrees rules out harmonic forms for sufficiently large $k$. The Dolbeault theorem and Dolbeault Hodge decomposition then imply $H^{q>0}(X,L^k)=0$.