  The possibility of observing nonclassical features in a physical system
comprised of a cavity with two ensembles of two-level atoms has been
investigated by considering different configurations of the ensembles with
respect to the Node and Antinode of the cavity field under the framework of
open quantum systems. The study reveals the strong presence of nonclassical
characters in the physical system by establishing the existence of many facets
of nonclassicality, such as the sub-Poissonian boson statistics and squeezing
in single modes, intermodal squeezing, intermodal entanglement, antibunching,
and steering. The effect of a number of parameters, characterizing the physical
system, on the different aspects of nonclassicality are also investigated.
Specifically, it is observed that the depth of the nonclassicality witnessing
parameters can be enhanced by externally driving one of the ensembles with an
optical field. The work is done in the presence of open system effects, in
particular, use is made of Langevin equations along with a suitable
perturbative technique.
