| Issue |
EPL
Volume 124, Number 4, November 2018
|
|
|---|---|---|
| Article Number | 41001 | |
| Number of page(s) | 6 | |
| Section | The Physics of Elementary Particles and Fields | |
| DOI | https://doi.org/10.1209/0295-5075/124/41001 | |
| Published online | 12 December 2018 | |
Phase-dependent 
-, non--, and anti--symmetry
Department of Physics, COMSATS University Islamabad - Pakistan, and Institute of Photonics and Technologies, National Tsing-Hua University - Hsinchu 300, Taiwan
Received: 7 August 2018
Accepted: 26 October 2018
We propose a scheme to realize 
-, non--, and anti--symmetry in an ensemble of four-level double-lambda configuration. We find that the ensemble of atoms exhibits either symmetry, non-symmetry and antisymmetry of parity-time 
in terms of the refractive index modulation. Such fascinating modulation of real and imaginary parts of refractive index is attained via the relative phase (ϕ) of the optical fields. The control of spatial modulations of refractive index then leads to the control of -, non--, and anti--symmetry via the relative phase of the optical fields. Such interesting and controllable system via relative phase may open a new way in observing -, non--, and anti--symmetry with gain-loss contrast in atomic systems.
PACS: 11.30.Er – Charge conjugation, parity, time reversal, and other discrete symmetries / 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 78.20.Ci – Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
© EPLA, 2018
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