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Realization and manipulation of parity-time (PT) symmetry in multidimensionalsystems are highly desirable for exploring nontrivial physics and uncoveringexotic phenomena in non-Hermitian systems. Here, we report the firstexperimental observation of partial PT (pPT) symmetry in a cesium atomic gascoupled with laser fields, where a two-dimensional pPT-symmetric opticalpotential for probe laser beam is created. A transition of the pPT symmetryfrom an unbroken phase to a broken one is observed through changing thebeam-waist ratio of the control and probe laser beams, and the domains ofunbroken, broken, and non-pPT phases are also discriminated unambiguously.Moreover, we develop a technique to precisely determine the location of theexceptional point of the pPT symmetry breaking by measuring the asymmetrydegree of the probe-beam intensity distribution. The findings reported herepave the way for controlling multidimensional laser beams in non-Hermitiansystems via laser-induced atomic coherence, and have potential applications fordesigning new types of light amplifiers and attenuators

Experimental Observation of Partial Parity-Time Symmetry and Its Phase Transition with a Laser-Driven Cesium Atomic Gas