Manipulation and control of rotary photon drag in a chiral quantum dot molecular system

This study investigates the manipulation and control of rotary photon drag in a chiral quantum dot molecular system. The system comprises two laterally coupled (In,Ga)As/GaAs quantum dots with distinct band configurations. The results demonstrate the ability to manipulate and control the rotary photon drag of both left-circularly polarized (LCP) and right-circularly polarized (RCP) beams, due to strong chirality induced by electromagnetic fields. Notably, considerable enhancements in rotary photon drag are observed, with values ranging from $\pm 20$ rad to $\pm 40$ rad for RCP and LCP beams, respectively. Additionally, the study highlights strong manipulation of the group index, divergence angle, and refractive index in these chiral quantum dot molecular systems. The group index is enhanced from $\pm 4\times 10^{11}$ to $\pm 6\times 10^{11}$ for both RCP and LCP beams. Furthermore, a maximum divergence angle of $3.4$ rad is observed between the RCP and LCP beams, along with enhanced refractive indices for both polarization states. The enhanced rotary photon drag facilitates precision optical manipulation, chiral sensing, advanced optical communication, and quantum information processing. This work also shows potential for enhancing light-matter interactions in photonic devices, advancing next-generation photonic circuits and sensors.