Strain-tunable single photon sources in WSe2 monolayers

Oliver Iff, Davide Tedeschi , Javier Martín-Sánchez , Magdalena Moczała-Dusanowska, Sefaattin Tongay, Kentaro Yumigeta, Javier Taboada-Gutiérrez , Matteo Savaresi, Alonso Rastelli, Pablo Alonso-González , Sven Höfling, Rinaldo Trotta, Christian Schneider

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78 Citations (Scopus)
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Abstract

The appearance of single photon sources in atomically thin semiconductors holds great promises for the development of a flexible and ultra-compact quantum technology, in which elastic strain engineering can be used to tailor their emission properties. Here, we show a compact and hybrid 2D-semiconductor-piezoelectric device that allows for controlling the energy of single photons emitted by quantum emitters localized in wrinkled WSe2 monolayers. We demonstrate that strain fields exerted by the piezoelectric device can be used to tune the energy of localized excitons in WSe2 up to 18 meV in a reversible manner, while leaving the single photon purity unaffected over a wide range. Interestingly, we find that the magnitude and in particular the sign of the energy shift as a function of stress is emitter dependent. With the help of finite element simulations we suggest a simple model that explains our experimental observations and, furthermore, discloses that the type of strain (tensile or compressive) experienced by the quantum emitters strongly depends on their localization across the wrinkles. Our findings are of strong relevance for the practical implementation of single photon devices based on two-dimensional materials as well as for understanding the effects of strain on their emission properties.
Original languageEnglish
Pages (from-to)6931-6936
JournalNano Letters
Volume19
Issue number10
Early online date5 Sept 2019
DOIs
Publication statusPublished - 9 Oct 2019

Keywords

  • SIngle photon emitters
  • 2D materials
  • Elastic strain engineering
  • Photoluminescence
  • Tungsten diselenide monolayers
  • Piezoelectric devices

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