Controllable tuning of exciton polariton condensate flow in a waveguide by phase modulation
Phys. Rev. B 112, 165305 – Published 10 October, 2025
DOI: https://doi.org/10.1103/gyjg-46hv
Abstract
Controllable particle flows play an important role in modern optics and photonics. Switching off photon flows using optical methods is challenging to realize due to the limited ways to control photon interactions. Here, we realize an exciton polariton condensate flow in a waveguide of a GaAs microcavity with a potential gradient by using a tight pumping spot. Polariton condensate flow along the waveguide can be periodically switched off and on globally by adding a second local small spot on the waveguide. Tuning the pumping density or position induces a pump intensity and position-dependent potential barrier modulating the phase of the condensate by a polariton-exciton interaction. This enables us to study the polariton condensation process in a waveguide by phase modulation, which could find important applications in integrated photonic circuits and chips.