Non-reciprocal band structures in an exciton–polariton Floquet optical lattice

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del Valle Inclan Redondo, Yago, et al. “Non-Reciprocal Band Structures in an exciton–polariton Floquet Optical Lattice”. Nature Photonics, 2024, https://doi.org/10.1038/s41566-024-01424-z.
del Valle Inclan Redondo, Y., Xu, X., Liew, T. C. H., Ostrovskaya, E. A., Stegmaier, A., Thomale, R., Schneider, C., Dam, S., Klembt, S., Höfling, S., Tarucha, S., & Fraser, M. D. (2024). Non-reciprocal band structures in an exciton–polariton Floquet optical lattice. Nature Photonics. https://doi.org/10.1038/s41566-024-01424-z
del Valle Inclan Redondo Y, Xu X, Liew TCH, Ostrovskaya EA, Stegmaier A, Thomale R, et al. Non-reciprocal band structures in an exciton–polariton Floquet optical lattice. Nature Photonics. 2024;.
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Description

Can the dynamics of quantum states be manipulated through periodic temporal modulation? This paper demonstrates an off-resonant optical lattice for a polariton condensate, using the interference between two lasers to create a controllable potential. The authors show that the breaking of time-reversal symmetry causes non-reciprocal band structures with a universal tilt, opening avenues for Floquet engineering in polariton condensates. The team introduces temporal modulation via a gigahertz frequency detuning between pump lasers, creating a polariton ‘conveyor belt.’ Detailed characterization of the lattice potential depth and its dynamics highlights the role of high-energy carriers in the formation of optical potential landscapes for polaritons. Results demonstrated the possibility of modulation faster than the polariton lifetime. These findings demonstrate the possibility of modulation faster than the polariton lifetime and opening a pathway towards Floquet engineering in polariton condensates, this study advances the understanding of topological phenomena in quantum systems and offers new possibilities for controlling light and matter interactions.

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