PT  - JOURNAL ARTICLE
AU  - Wen, Te
AU  - Zhang, Weidong
AU  - Liu, Shuai
AU  - Hu, Aiqin
AU  - Zhao, Jingyi
AU  - Ye, Yu
AU  - Chen, Yang
AU  - Qiu, Cheng-Wei
AU  - Gong, Qihuang
AU  - Lu, Guowei
TI  - Steering valley-polarized emission of monolayer MoS<sub>2</sub> sandwiched in plasmonic antennas
AID  - 10.1126/sciadv.aao0019
DP  - 2020 May 01
TA  - Science Advances
PG  - eaao0019
VI  - 6
IP  - 21
4099  - http://advances.sciencemag.org/content/6/21/eaao0019.short
4100  - http://advances.sciencemag.org/content/6/21/eaao0019.full
SO  - Sci Adv2020 May 01; 6
AB  - Monolayer transition metal dichalcogenides have intrinsic spin-valley degrees of freedom, making it appealing to exploit valleytronic and optoelectronic applications at the nanoscale. Here, we demonstrate that a chiral plasmonic antenna consisting of two stacked gold nanorods can modulate strongly valley-polarized photoluminescence (PL) of monolayer MoS2 in a broad spectral range at room temperature. The valley-polarized PL of the MoS2 using the antenna can reach up to ~47%, with approximately three orders of PL magnitude enhancement within the plasmonic nanogap. Besides, the K and K′ valleys under opposite circularly polarized light excitation exhibit different emission intensities and directivities in the far field, which can be attributed to the modulation of the valley-dependent excitons by the chiral antenna in both the excitation and emission processes. The distinct features of the ultracompact hybrid suggest potential applications for valleytronic and photonic devices, chiral quantum optics, and high-sensitivity detection.