Exponential mixing for the randomized two-vortex model

This paper investigates the mixing of passive scalars advected by a randomized two-vortex model on T², in which the vortices interact through a regularized Biot--Savart kernel and are driven by independent Brownian motions. We establish quenched exponential mixing for the Lagrangian flow, characterized by the exponential correlation decay of mean-zero Hˢ observables. The proof proceeds by establishing ergodicity of the associated two-point Markov process. We combine a uniform contraction estimate with controllability arguments to verify the Lyapunov drift and minorization conditions, allowing us to apply Harris-type theorem.