Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 26: 2D Materials and Heterostructures: Quantum Emitters and Defects
HL 26.10: Talk
Wednesday, March 20, 2024, 12:00–12:15, EW 201
Monolayer-based single photon source in an open cavity featuring 65 % brightness and quantum coherence — •Jens-Christian Drawer1, Victor Nicolaevich Mitryakhin1, Hangyong Shan1, Sven Stephan1,2, Falk Eilenberger3, Martin Silies2, Carlos Anton-Solanas1, Martin Esmann1, and Christian Schneider1 — 1Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany — 2Hochschule Emden/Leer, Emden, Germany — 3Friedrich-Schiller-Universität Jena, Jena, Germany
In the fields of quantum communication and computation, non-classical light in the form of single photons is of critical importance. A promising candidate for single-photon sources are atomically thin crystals of layered van der Waals materials, although their performance has thus far been inferior to other state-of-the-art sources built from bulk crystals and semiconductors, such as InAs quantum dots. Here we present results from a single-photon source based on an atomically thin layer of WSe2 coupled to an open-cavity optical resonator and operated at a temperature of 3.2 K. A finely tuned cavity enables selective Purcell-enhanced emission with efficient quasi-resonant emitter excitation. We characterize its single-photon purity to be g(2)(0)=0.047±0.007, measured by the second-order coherence function g(2) in the Hanbury Brown and Twiss setup under pulsed operation, and observe a first-lens brightness of 65±4 % of linearly polarized photons. A first observation for this material, to our knowledge, was made in the form of quantum interference between successively emitted photons in a Hong-Ou-Mandel experiment.
Keywords: two-dimensional materials; quantum dots; single-photon source; open microcavity