posted on 2021-01-27, 17:55authored byJae-Pil So, Kwang-Yong Jeong, Jung Min Lee, Kyoung-Ho Kim, Soon-Jae Lee, Woong Huh, Ha-Reem Kim, Jae-Hyuck Choi, Jin Myung Kim, Yoon Seok Kim, Chul-Ho Lee, SungWoo Nam, Hong-Gyu Park
Single-photon
emitters, the basic building blocks of quantum communication
and information, have been developed using atomically thin transition
metal dichalcogenides (TMDCs). Although the bandgap of TMDCs was spatially
engineered in artificially created defects for single-photon emitters,
it remains a challenge to precisely align the emitter’s dipole
moment to optical cavities for the Purcell enhancement. Here, we demonstrate
position- and polarization-controlled single-photon emitters in monolayer
WSe2. A tensile strain of ∼0.2% was applied to monolayer
WSe2 by placing it onto a dielectric rod structure with
a nanosized gap. Excitons were localized in the nanogap sites, resulting
in the generation of linearly polarized single-photon emission with
a g(2) of ∼0.1 at 4 K. Additionally, we measured
the abrupt change in polarization of single photons with respect to
the nanogap size. Our robust spatial and polarization control of emission
provides an efficient way to demonstrate deterministic and scalable
single-photon sources by integrating with nanocavities.