Triangular-lattice Ising Model in a Nonzero Magnetic Field

We investigate the unknown properties of the triangular-lattice Ising model in a nonzero magnetic field, by analyzing its high-field and low-temperature power-series expansion and by using its partition function zeros in the complex temperature plane. The locations and the edge critical exponents of the Fisher edge singularities for the triangular-lattice Ising model in a nonzero magnetic field are found for the first time. Our results are invaluable in understanding the triangular-lattice Ising model in a nonzero magnetic field and in searching for its (yet unknown) exact solution.