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We apply the Grassmann tensor renormalization group to the lattice regularized Schwinger model with one-flavor of the Wilson fermion. We study the phase diagram in the (, ) plane performing a detailed analysis of the scaling behavior of the Lee-Yang zeros and the peak height of the chiral susceptibility. Our results strongly indicate that the whole range of the phase transition line starting from (, ) = (0. 0, 0. 380665 (59) ) and ending at (, 0. 25) belongs to the two-dimensional Ising universality class similar to the free fermion case.
Shimizu et al. (Wed,) studied this question.