Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.048
Publication date: 22nd December 2022
Progress of light-based technology has led to a paradigm shift in materials design: light, which has been commonly relegated to a mere probe of material properties, can be instead exploited to alter material properties altogether [1,2]. Central in the paradigm shift is the possibility of generating strong coupling between light and matter and in turn induce the formation of light-matter hybrid states with properties which can be controlled on demand. An intriguing route to achieve strong light-matter coupling is to embed materials inside cavities [3, 4], where the coupling is enhanced by the confinement of light in a small region of space [4]. In the talk, I will present theoretical results based on first-principles methods on three different hybrid light-matter designs. I will demonstrate the formation of exciton-light hybrid states in 2D crystals embedded in a cavity and the tunability over their energetics and brightness [5]. I will then show how the strong light-matter coupling allows for the design of a three-way exciton-phonon-photon quasiparticle which is characterized by unique features in optical response [6]. Finally, I will introduce the concept of a photo-groundstate by demonstrating that the vacuum fluctuations of light can induce a change of the collective phase from paraelectric to ferroelectric in the groundstate of SrTiO3 (see Fig. adapted from [7]), which has thus far only been achieved in out-of equilibrium strongly excited conditions [1]. These findings demonstrate the potential of cavity material engineering as a new paradigm for material manipulation.
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