Observation of Parity-Time Symmetry in Optically Induced Atomic Lattices

Abstract

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 such readily reconfigurable and effectively controllable PT-symmetric waveguide array structure sets a new stage for further exploiting and better understanding the peculiar physical properties of these non-Hermitian systems in atomic settings.

11 pages, 7 figures

References in corpus (9)

• Making Sense of Non-Hermitian Hamiltonians
• Coherent Perfect Absorbers: Time-reversed Lasers
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• Observation of Parity-Time Symmetry in Optically Induced Atomic Lattices
• Solitons in PT-symmetric nonlinear lattices
• PT-Symmetric Talbot Effects
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