期刊
PHYSICAL REVIEW A
卷 95, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.95.023833
关键词
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资金
- National Natural Science Foundation of China (NSFC) [11475063, 11474099]
- Program of Introducing Talents of Discipline to Universities [B12024]
- National Basic Research Program of China [2016YFA0302103]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1620039] Funding Source: National Science Foundation
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)] 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.
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