Abstract:
The physical properties of crystalline materials ultimately depend on the inter-distance between their constitutive atoms. Hence, the deliberate introduction of elastic deformation fields (strain) in materials with a full control of the strain tensor would allow a complete tailoring of their physical properties. In this regard, strain fields provide a unique and interesting tuning knob for tailoring the optical emission properties of nanomaterials and quantum emitters [1]. A promising technological approach is based on the use of a novel class of customized micro-machined piezoelectric actuators allowing for the introduction of controlled deformation fields in nanomaterials, which can be operated under extreme working conditions [2].
In this talk, I will present the capabilities of this kind of devices with a reduced fingerprint to introduce fully controlled in-plane strain fields in semiconductor nanomaterials in a reversible manner operated at cryogenic temperatures. The successful fabrication and applicability of hybrid semiconductor-piezoelectric devices will be demonstrated for the manipulation of the optical emission properties of single photon sources in WSe2 semiconductor monolayers [3] and self-assembled InAs/GaAs quantum dots nanostructures [4-6].
Bio:
Dr. Javier Martín-Sánchez holds a PhD in Physics obtained in 2009 at the Microelectronic Institute of Madrid (CSIC) on molecular beam epitaxy growth and the optical characterization of quantum confined III-V nanostructures for single photon emission applications. From 2010 to 2013, he performed short postdoctoral stays at the Paul-Drude-Institute (Berlin, Germany), University of Minho (Braga, Portugal) and the Institute of Optics (CSIC) (Madrid, Spain) to work on the fabrication and optical characterization of group-IV and III-V quantum dots.
In 2013, he joined the Nanoscale Semiconductors and Nanophotonics group led by Prof. Armando Rastelli at the Johannes Kepler University (Linz, Austria) where his research was focused on the elastic strain engineering of the optical properties of self-assembled III-V quantum dots and 2D semiconductor materials for quantum photonics. Since 2017 he is working as an independent researcher at the University of Oviedo investigating strain effects on the optical properties of 2D materials in the Quantum Nanooptics group, established by himself and Dr. Pablo Alonso-González. His studies include single photon emission and phonon-polaritons propagation in 2D materials. Currently, he is holding a tenure track position as a Ramón y Cajal researcher.
References:
[1] Semicond. Sci. Technol. 33 013001 (2017)
[2] Adv. Opt. Mater. 4 682 (2016)
[3] Nano Lett. 19 6931 (2019)
[4] Phys. Rev. Lett. 114 150502 (2015)
[5] Nature Commun. 7 10375 (2016)
[6] Nature Commun. 9 3058 (2018)
Hosted by Riccardo Rurali, Materials Simulations and Theory group, ICMAB-CSIC
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