@renerehwagen

Highly Polarized Single Photons from Strain-Induced Quasi-1D Localized Excitons in WSe2

, , , , , , , , and . Nano Letters 21 (17): 7175-7182 (2021)PMID: 34424710.

Abstract

Single photon emission from localized excitons in two-dimensional (2D) materials has been extensively investigated because of its relevance for quantum information applications. Prerequisites are the availability of photons with high purity polarization and controllable polarization orientation that can be integrated with optical cavities. Here, deformation strain along edges of prepatterned square-shaped substrate protrusions is exploited to induce quasi-one-dimensional (1D) localized excitons in WSe2 monolayers as an elegant way to get photons that fulfill these requirements. At zero magnetic field, the emission is linearly polarized with 95\% purity because exciton states are valley hybridized with equal shares of both valleys and predominant emission from excitons with a dipole moment along the elongated direction. In a strong field, one valley is favored and the linear polarization is converted to high-purity circular polarization. This deterministic control over polarization purity and orientation is a valuable asset in the context of integrated quantum photonics.

Description

Highly Polarized Single Photons from Strain-Induced Quasi-1D Localized Excitons in WSe2 | Nano Letters

Links and resources

DOI:
10.1021/acs.nanolett.1c01927
URL:
BibTeX key:
doi:10.1021/acs.nanolett.1c01927
search on:

Comments and Reviews  
(0)

There is no review or comment yet. You can write one!

Tags


Cite this publication