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A spin chain model with non-Hermitian interaction: the Ising quantum spin chain in an imaginary field

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Figure

Figure 1: Domains of broken and unbroken PT -symmetry
Figure 2: Avoided level crossing: eigenvalues as functions of λ (κ) for fixed κ (λ).
Table 1: The coefficients a2k+1(λ) for k < 8.
Table 3: Relative error = —(perturbative value - exact value) / exact value— for h11 order byorder.
+4

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