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Main Title: Thermal stability of emission from single InGaAs/GaAs quantum dots at the telecom O-band
Author(s): Holewa, Paweł
Burakowski, Marek
Musiał, Anna
Srocka, Nicole
Quandt, David
Strittmatter, André
Rodt, Sven
Reitzenstein, Stephan
Sęk, Grzegorz
Type: Article
Abstract: Single-photon sources are key building blocks in most of the emerging secure telecommunication and quantum information processing schemes. Semiconductor quantum dots (QD) have been proven to be the most prospective candidates. However, their practical use in fiber-based quantum communication depends heavily on the possibility of operation in the telecom bands and at temperatures not requiring extensive cryogenic systems. In this paper we present a temperature-dependent study on single QD emission and single-photon emission from metalorganic vapour-phase epitaxy-grown InGaAs/GaAs QDs emitting in the telecom O-band at 1.3 μm. Micro-photoluminescence studies reveal that trapped holes in the vicinity of a QD act as reservoir of carriers that can be exploited to enhance photoluminescence from trion states observed at elevated temperatures up to at least 80 K. The luminescence quenching is mainly related to the promotion of holes to higher states in the valence band and this aspect must be primarily addressed in order to further increase the thermal stability of emission. Photon autocorrelation measurements yield single-photon emission with a purity of g(2)50K(0)=0.13 up to 50 K. Our results imply that these nanostructures are very promising candidates for single-photon sources at elevated (e.g., Stirling cryocooler compatible) temperatures in the telecom O-band and highlight means for improvements in their performance.
Subject(s): quantum dots
quantum effects
single photons
Issue Date: 11-Dec-2020
Date Available: 3-Mar-2021
Language Code: en
DDC Class: 530 Physik
Journal Title: Scientific Reports
Publisher: Springer
Volume: 10
Article Number: 21816
Publisher DOI: 10.1038/s41598-020-78462-4
EISSN: 2045-2322
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Festkörperphysik » AG Optoelektronik und Quantenbauelemente
Appears in Collections:Technische Universität Berlin » Publications

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