Small data scattering of Dirac equations with Yukawa type potentials in $L_x^2(\mathbb R^2)$

We revisit the Cauchy problem of nonlinear massive Dirac equation with Yukawa type potentials $\mathcal F^{-1}\left[(b^2 + |\xi|^2)^{-1}\right]$ in 2 dimensions. The authors of [10, 4] obtained small data scattering and large data global well-posedness in $H^s$ for $s > 0$, respectively. In this paper, we show that the small data scattering occurs in $L_x^2(\mathbb R^2)$. This can be done by combining bilinear estimates and modulation estimates of [12,10].