Realization of non- PT -symmetric optical potentials with all-real spectra in a coherent atomic system

Chao Hang, Gregory Gabadadze, Guoxiang Huang

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present a physical setup for realizing all-real-spectrum optical potentials with arbitrary gain-and-loss distributions in a coherent medium consisting of a cold three-level atomic gas driven by control and probe laser fields. We show that by the interference of Raman resonances and the Stark shift induced by a far-detuned laser field, tunable, non-parity-time (non-PT)-symmetric optical potentials with all-real spectra proposed recently by Nixon and Yang [Phys. Rev. A 93, 031802(R) (2016)2469-992610.1103/PhysRevA.93.031802] can be actualized physically. We also show that when the real parts of the non-PT-symmetric optical potentials are tuned cross certain thresholds, phase transitions - where the eigenspectrum of the system changes from all real to complex - may occur and hence the stability of the probe-field propagation is altered. Our scheme can also be extended to high dimensions and to a nonlinear propagation regime, where stable optical solitons with power of the order of nano-Watts may be generated in the system.

    Original languageEnglish (US)
    Article number023833
    JournalPhysical Review A
    Volume95
    Issue number2
    DOIs
    StatePublished - Feb 21 2017

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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