Effective non-Hermitian physics for degenerate ground states of a nonHermitian Ising model with $\mathcal{RT}$ symmetry

23 Mar 2020 Wang Can Yang Meng-Lei Guo Cui-Xian Zhao Xiao-Ming Kou Su-Peng

In this paper, based on a one-dimensional non-Hermitian spin model with $\mathcal{RT}$-invariant term, we study the non-Hermitian physics for the two (nearly) degenerate ground states. By using the high-order perturbation method, an effective pseudo-spin model is obtained to describe non-Hermitian physics for the two (nearly) degenerate ground states, which are precisely consistent with the numerical calculations... (read more)

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  • STATISTICAL MECHANICS
  • QUANTUM PHYSICS