Phys.org February 13, 2024
To investigate light-matter hybrid excitations in a quantum dot (QD) THz resonator coupled system researchers in Japan fabricated a gate-defined QD near a THz split-ring resonator (SRR) by using a AlGaAs/GaAs two-dimensional electron system. By illuminating the system with THz radiation, the QD showed a current change whose spectrum exhibited coherent coupling between the electrons in the QD and the SRR as well as coupling between the two-dimensional electron system and the SRR. The latter coupling entered the ultrastrong coupling regime and the electron excitation in the QD also exhibited coherent coupling with the SRR with the remarkably large coupling constant, despite the fact that only a few electrons reside in the QD… read more. Open Access TECHNICAL ARTICLE
a) … illustration of our QD-SRR coupled sample…Phys. Rev. Lett. 132, 066901, 9 February 2024