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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">PT</mml:mi></mml:math>-symmetric optical potentials in a coherent atomic medium
We propose that a coherently prepared four-level atomic medium can provide a versatile platform for realizing parity-time ($\mathcal{PT}$) symmetric optical potentials. Different types of $\mathcal{PT}$-symmetric potentials are proposed by appropriately tuning the exciting optical fields and the pertinent atomic parameters. Such reconfigurable and controllable systems may open up new avenues …