Elementary excitations in the hybrid Bose-Fermi system induced by circularly polarized light in a two-dimensional gas of charge carriers with different masses

We developed a theory describing elementary excitations in the Bose-Fermi\nsystem induced by circularly polarized light in a two-dimensional (2D) gas of\ncharge carriers with different masses. In such a hybrid system, the Fermi\nsubsystem is a degenerate Fermi gas, whereas the Bose subsystem is a condensate\nof the light-induced composite bosons consisting of two fermions (electrons or\nholes) with different effective masses. The interaction of the single-particle\nexcitations and the collective excitations (plasmons) in the Fermi subsystem\nwith the Bogoliubov collective modes (bogolons) in the Bose subsystem is\nanalyzed. The renormalization and damping (lifetime) of the excitations are\ncalculated, and the possibility of their experimental observation is discussed.\nThe developed theory can be applied to describe 2D condensed-matter structures\ncontaining charge carriers with different effective masses, including\ntransition metal dichalcogenide monolayers and semiconductor quantum wells.\n