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20242026
most citedEmergent $\PT$ Symmetry and Exceptional Points in a Driven Dirac Impurity

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quant-ph2026

Derivation of a $\PT$-Symmetric Sine-Gordon Model from a Nonequilibrium Spin-Boson System via Keldysh Functional Integrals

Vinayak M. Kulkarni

We present a microscopic derivation from a nonequilibrium spin-boson model to a $\PT$-symmetric non-Hermitian sine-Gordon (SG) effective theory, via the Keldysh functional-integral…