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A single quantum dot (QD) strongly coupled with a plasmonic nanoparticle yields a promising qubit for scalable solidstate quantum information processing at room temperature. However, realizing such a strong coupling remains challenging due to the difficulty of spatial overlap of the QD excitons with the plasmonic electric fields (EFs). Here, by using a transmission electron microscope we demonstrate for the first time that this overlap can be realized by integrating a deterministic single QD with a single Au nanorod. When a wedge nanogap cavity consisting of them and the substrate is constructed, the plasmonic EFs can be more effectively "dragged" and highly confined in the QD's nanoshell where the excitons mainly reside. With these advantages, we observed the largest spectral Rabi splitting (reported so far) of ∼234 meV for a single QD strong coupling with plasmons. Our work opens a pathway to the massive construction of roomtemperature strong coupling solid qubits.

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This work investigates the criticality of the dilute-to-dense transition in an inclined quasi-2D granular channel flow. At fixed inflow rate Q0 and exit opening size d, the waiting time t before the transition occurs after a dilute flow is initiated at t = 0 is recorded. The histogram f(t) of the number of times counted that the transition occurs at a time t is plotted as a function of t for each d. It is found that the probability function C(t) for the flow remaining dilute at a waiting time t decays exponentially, and its characteristic time α−1(d) can be fitted well to a power law a(dc−d)−γ with dc the critical opening size beyond which the transition will never occur.