Critical behavior of lattice Schwinger model with topological term at $θ=π$ using Grassmann tensor renormalization group

Lattice regularized Schwinger model with a so-called $θ$ term is studied by using the Grassmann tensor renormalization group. We perform the Lee-Yang and Fisher zero analyses in order to investigate the phase structure at $θ=π$. We find a first order phase transition at larger fermion mass. Both of the Lee-Yang zero and Fisher zero analyses indicate that the critical endpoint at which the first order phase transition terminates belongs to the Ising universality class.

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