Title: Surface defects and elliptic quantum groups,
Abstract: A brane construction of an integrable lattice model is proposed. The model is
composed of Belavin's R-matrix, Felder's dynamical R-matrix, the
Bazhanov-Sergeev-Derkachov-Spiridonov R-operator and some intertwining
operators. This construction implies that a family of surface defects act on
supersymmetric indices of four-dimensional $\mathcal{N} = 1$ supersymmetric
field theories as transfer matrices related to elliptic quantum groups.