Electrical Control of Single Photon Emitters in WSe<sub>2</sub> on a Si Nanopyramid Array with a Negligible Stark Effect.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41814500.
- Also identified by DOI 10.1021/acs.nanolett.5c05425 and PMC identifier 13195733.
- Licence recorded as CC BY-NC-ND.
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Abstract
Single-photon emitters (SPEs) based on two-dimensional (2D) materials have attracted a lot of attention due to their unique benefits such as mechanical flexibility, high quantum yield, and easy integration on a chip. However, the electrical modulation of such emitters at a single-photon level still remains a challenge. Herein, we provide a new route to engineer electrically controllable purified SPEs in a monolayer (1L) WSe<sub>2</sub> using a Si nanopyramid structure. The Si nanopyramid structures allow not only the generation of high strain to localize the SPEs but also the application of voltage for electrical modulation. Of particular interest, while our structure modulates the single-photon emission with an applied gate voltage, it does not exhibit unwanted spectral shift for the applied voltage, i.e., a negligible Stark effect, due to the existence of an air gap between the 1L-WSe<sub>2</sub> and the nanopyramid. The single photon purity is improved by electrical modulation down to g<sup>(2)</sup>(0) = 0.06 ± 0.03.