(m,n)-strings in IIB matrix model

By adding gauge fields to the D-string classical solution, which have non-zero contribution to commutators in continuum limit (extreme large N), we introduced (m,n)-strings in IIB matrix model. It is found that the size of matrices depends on the value of the electric field. The tension of these strings appears in SL(2,Z) invariant form. The interaction for parallel and angled strings are found in agreement with the string theory for small electric fields.