  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.
