PT symmetric optical potentials in a coherent atomic medium
We demonstrate that a coherently prepared four level atomic medium can provide a versatile platform for realizing parity time (PT) symmetric optical potentials. Different types of PT symmetric potentials are proposed by appropriately tuning the exciting optical fields and the pertinent atomic parameters. Such reconfigurable and controllable systems can open up new avenues in observing PT related phenomena with appreciable gain/loss contrast in coherent atomic media.