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Hybrid quantum optomechanics with a quantum-dot single photon source
Yeo, Inah,Kim, Hye Jung,Song, Jin Dong,Yi, Kyung Soo American Physical Society 2016 Physical Review B Vol.94 No.16
<P>We investigate the strain-mediated control of individual single quantum dots (QDs) embedded in a multi-degree- of-freedom optomechanical resonator. The mechanical eigenfrequencies and their mode degeneracy of resonator are tailored in the MHz regime for a geometrical aspect ratio of conventional wire resonator. The stress-induced modification in the QD exciton dynamics is evaluated at the multitude of mechanical resonances including the genuine cases of mode degeneracy. We show that the multi-degree-of-freedom stress fields allow an individual control of QD emission energies with a rate of up to several meV/nm. Such an optomechanical tuning technique can pave the way for entangling distant QDs for quantum information processing or potentially generating a superradiant light pulse.</P>
Jang Sangwon,Park Inah,Choi Mijung,Kim Jihoon,Yeo Seungeun,Huh Sung-Oh,Choi Ji-Woong,Moon Cheil,Choe Han Kyoung,Choe Youngshik,Kim Kyungjin 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
Social interaction among conspecifics is essential for maintaining adaptive, cooperative, and social behaviors, along with survival among mammals. The 5-hydroxytryptamine (5-HT) neuronal system is an important neurotransmitter system for regulating social behaviors; however, the circadian role of 5-HT in social interaction behaviors is unclear. To investigate whether the circadian nuclear receptor REV-ERBα, a transcriptional repressor of the rate-limiting enzyme tryptophan hydroxylase 2 (Tph2) gene in 5-HT biosynthesis, may affect social interaction behaviors, we generated a conditional knockout (cKO) mouse by targeting Rev-Erbα in dorsal raphe (DR) 5-HT neurons (5-HTDR-specific REV-ERBα cKO) using the CRISPR/Cas9 gene editing system and assayed social behaviors, including social preference and social recognition, with a three-chamber social interaction test at two circadian time (CT) points, i.e., at dawn (CT00) and dusk (CT12). The genetic ablation of Rev-Erbα in DR 5-HTergic neurons caused impaired social interaction behaviors, particularly social preference but not social recognition, with no difference between the two CT points. This deficit of social preference induced by Rev-Erbα in 5-HTDR-specific mice is functionally associated with real-time elevated neuron activity and 5-HT levels at dusk, as determined by fiber-photometry imaging sensors. Moreover, optogenetic inhibition of DR to nucleus accumbens (NAc) 5-HTergic circuit restored the impairment of social preference in 5-HTDR-specific REV-ERBα cKO mice. These results suggest the significance of the circadian regulation of 5-HT levels by REV-ERBα in regulating social interaction behaviors.
Exciton-phonon coupling channels in a ‘strain-free’ GaAs droplet epitaxy single quantum dot
Lee, Song-ee,Yeo, Inah,Jo, Min Kyung,Jeong, Young Woo,Kim, Tae Geun,Kim, Jong Su,Yi, Kyung Soo,Han, Il Ki,Song, Jin Dong ELSEVIER 2018 Current Applied Physics Vol.18 No.7
<P>We examine the temperature-dependent excitonic transition energy shift of strain-free GaAs droplet epitaxy ( DE) quantum dots (QDs). Interestingly the statistical investigation of QD optical properties enables us to observe three distinct temperature dispersions for four series of DE QDs. We present comparative analyses of the excitonphonon coupling mechanisms employing various empirical to multi-oscillator models associated with each QD-specific phonon dispersion spectrum. The systematic investigation of such QD exciton-phonon coupling is crucial for fine control of local defects in engineered quantum dot single-photon sources.</P>