Observation of Parity-Time Symmetry in Optically Induced Atomic Lattices
Observation of Parity-Time Symmetry in Optically Induced Atomic Lattices
We experimentally demonstrate PT-symmetric optical lattices with periodical gain and loss profiles in a coherently prepared four-level N-type atomic system. By appropriately tuning the pertinent atomic parameters, the onset of PT-symmetry breaking is observed through measuring an abrupt phase-shift jump between adjacent gain and loss waveguides. The experimental realization of …