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Strain-induced dynamic control over the population of quantum emitters in two-dimensional materials

  • The discovery of quantum emitters in two-dimensional materials has triggered a surge of research to assess their suitability for quantum photonics. While their microscopic origin is still the subject of intense studies, ordered arrays of quantum emitters are routinely fabricated using static strain-gradients, which are used to drive excitons toward localized regions of the 2D crystals where quantum-light-emission takes place. However, the possibility of using strain in a dynamic fashion to control the appearance of individual quantum emitters has never been explored so far. In this work, we tackle this challenge by introducing a novel hybrid semiconductor-piezoelectric device in which WSe2 monolayers are integrated onto piezoelectric pillars delivering both static and dynamic strains. Static strains are first used to induce the formation of quantum emitters, whose emission shows photon anti-bunching. Their excitonic population and emission energy are then reversibly controlled via the application of a voltage to the piezoelectric pillar. Numerical simulations combined with drift-diffusion equations show that these effects are due to a strain-induced modification of the confining-potential landscape, which in turn leads to a net redistribution of excitons among the different quantum emitters. Our work provides relevant insights into the role of strain in the formation of quantum emitters in 2D materials and suggests a method to switch them on and off on demand.

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Author:Matteo Savaresi, Abel Martínez-Suárez, Davide Tedeschi, Giuseppe Ronco, Aurelio Hierro-Rodríguez, Stephen McVitie, Sandra Stroj, Johannes Aberl, Moritz Brehm, Victor M. García-Suárez, Michele B. Rota, Pablo Alonso-González, Javier Martín-Sánchez, Rinaldo Trotta
DOI:https://doi.org/10.48550/arXiv.2301.10273
Parent Title (English):Arxiv, cond-mat
Document Type:Preprint
Language:English
Year of publication:2023
Release Date:2024/02/29
Number of pages:13
Organisationseinheit:Forschung / Forschungszentrum Mikrotechnik
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 600 Technik
Open Access?:ja
Peer review:wiss. Beitrag, nicht peer-reviewed
Publicationlist:Stroj, Sandra