Generation of optical PT-antisymmetry in a coherent N-type atomic medium

We have proposed two schemes to exhibit PT-antisymmetry in a four-level N-type atomic system interacting with two strong driving fields anda weak probe field. For both the schemes, the required spatially modulated coherence rendering PT-antisymmetry is achieved by employing a double-channel Gaussian beam for one driving field with a single channel for the other driving field in different field configurations. In each scheme, for equal and opposite detunings of the double-channel Gaussian beam, PT-antisymmetry can be obtained in the spatial domain. Such away of control is unique to this model. Using the present method, it is possible to obtain PT-antisymmetry for both the homogeneously and inhomogeneously broadened atoms.

Automated summary

We propose two schemes to demonstrate PT-antisymmetry in a four-level N-type atomic system interacting with two strong driving fields and a weak probe field. By using a double-channel Gaussian beam for one driving field and a single-channel Gaussian beam for the other driving field in different field configurations, the required spatially modulated coherence for PT-antisymmetry is achieved. In each scheme, PT-antisymmetry can be obtained in the spatial domain for equal and opposite detunings of the double-channel Gaussian beam. This method is unique in providing control over PT-antisymmetry for both homogeneously and inhomogeneously broadened atoms.