Braid actions on quantum toroidal superalgebras

We prove that the quantum toroidal algebras $\mathcal{E}_\mathbf{s}$ associated with different root systems $\mathbf{s}$ of $\mathfrak{gl}_{m|n}$ type are isomorphic. We also show the existence of Miki automorphism of $\mathcal{E}_\mathbf{s}$, which exchanges the vertical and horizontal subalgebras. To obtain these results, we establish an action of the toroidal braid group on the direct sum $\oplus_\mathbf{s} \mathcal{E}_\mathbf{s}$ of all such algebras.