Coherent interaction of a-few-electron quantum dot with a terahertz optical resonator in the ultrastrong coupling regime

• URL: http://arxiv.org/abs/2204.10522v1
• Date: Fri, 22 Apr 2022 06:22:09 GMT
• Title: Coherent interaction of a-few-electron quantum dot with a terahertz optical resonator in the ultrastrong coupling regime
• Authors: Kazuyuki Kuroyama, Jinkwan Kwoen, Yasuhiko Arakawa, Kazuhiko Hirakawa
• Abstract summary: We fabricate a gate-defined quantum dot (QD) in the vicinity of a gap of a terahertz (THz) split-ring resonator (SRR) By illuminating the system with external THz radiation, the QD shows a current change whose spectrum exhibits anti-crossing behavior. Our result indicates that, owing to the field enhancement by the THz SRR, the system enters the ultrastrong coupling regime even when only a few electrons reside in the QD.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Hybrid excitations of light and matter, namely, polaritons, in the ultrastrong coupling regime have been intensively investigated to explore novel material functions and realize coherent control of material properties by optical means. However, realization of ultrastrong coupling in a-few-electron systems has been challenging, because the electronic dipole moment decreases with decreasing electron numbers in the system. Here, we fabricate a gate-defined quantum dot (QD) in the vicinity of a gap of a terahertz (THz) split-ring resonator (SRR). By illuminating the system with external THz radiation, the QD shows a current change whose spectrum exhibits anti-crossing behavior between the resonant excitation of the quantized electronic states and the resonance mode of the SRR. Our result indicates that, owing to the field enhancement by the THz SRR, the system enters the ultrastrong coupling regime even when only a few electrons reside in the QD.

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