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Nonlinear topological edge states in a non-Hermitian array of optical waveguides embedded in an atomic gas

Nonlinear topological edge states in a non-Hermitian array of optical waveguides embedded in an atomic gas

We propose a scheme comprising an array of anisotropic optical waveguides, embedded in a gas of cold atoms, which can be tuned from a Hermitian to an odd-PT -- symmetric configuration through the manipulation of control and assistant laser fields. We show that the system can be controlled by tuning …