Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session L15: 2D Materials (Semiconductors) -- Quantum Interactions in Transport and Optical Phenomena
11:15 AM–2:15 PM,
Wednesday, March 6, 2019
BCEC
Room: 154
Sponsoring
Unit:
DMP
Chair: Jifa Tian, U. Wyoming
Abstract: L15.00007 : Tracking the origin of single photon emitters in WSe2
12:27 PM–12:39 PM
Presenter:
Lukas Linhart
(Institute for Theoretical Physics, TU Vienna)
Authors:
Lukas Linhart
(Institute for Theoretical Physics, TU Vienna)
Matthias Paur
(Institute of Photonics, TU Vienna)
Valerie Smejkal
(Institute for Theoretical Physics, TU Vienna)
Thomas Mueller
(Institute of Photonics, TU Vienna)
Joachim E Burgdoerfer
(Institute for Theoretical Physics, TU Vienna)
Florian M Libisch
(Institute for Theoretical Physics, TU Vienna)
explanation has proven elusive.
Using a multiscale approach we established a tight-binding model capturing non-uniform strain, defects and coulomb-interactions we elucidate this mystery. Tight-binding calculations with local strain patterns and open boundary conditions for a large WSe2 flake yield quantum-dot-like localization. Including defects we can reproduce and explain the large g-factor (≈ 9) as well as the zero field splitting, the linear polarization and the electric field dependence.
We conclude that local strain shifts excitonic energy levels into an energy of otherwise unoccupied inter-gap defect states, acting as a doorkeeper to fill these states. Together with localized
valence bands, this leads to sharp SPE.
[1] P. Tonndorf, et.al., "Single-photon emission from localized excitons in an atomically thin semiconductor", Optica, 2, 347-352, (2015).
[2] Koperski M., et.al., ”Single photon emitters in exfoliated WSe 2 structures”,Nature Nano, 10, 503-605, (2015).
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