Localised excitons in 2-D materials for integrated quantum optics

phys.org | 2/14/2019 | Staff
Celtics2212 (Posted by) Level 3
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NUS scientists have found that the oxygen interstitials in single-layer tungsten diselenide (WSe2) enable it to function as single photon emitters (SPEs) for quantum optical applications.

Two-dimensional (2-D) materials with atomically thin honeycomb-like lattices were recently discovered experimentally for use as SPEs. SPEs emit light as single particles or photons one at a time and they play an important role in quantum optics and quantum information processing. SPEs developed using 2-D materials such as WSe2, provide flexibility for potential device and circuit integration in a semiconductor manufacturing environment. However, the nature of these experimentally discovered SPEs in WSe2 is not clear and this hinders their potential use in quantum applications.

Prof - Su - QUEK - Department - Physics

Prof Su Ying QUEK from the Department of Physics, NUS and her research team have identified that the single photon emissions coming from the localized exciton states in WSe2 were due to the oxygen interstitials present in the single-layer 2-D material. The research team used a combination of theoretical computations and experimental approaches to arrive at the outcome. With better understanding of the origins...
(Excerpt) Read more at: phys.org
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