Thursday October 27th, 2022
h 2.30 p.m.
U5 Building, 1st floor, Seminar Room, – via Roberto Cozzi 55, Milano
Lecturer: prof. Stefano Lupi – Department of Physics and INFN, Sapienza University of Rome
Title: Linear and non Linear Photonics based on Topological Matter
Abstract. After the 2016 Nobel Prize in Physics, topological matter is now becoming a new paradigm in quantum physics and nanotechnology. 3D Topological Insulators (TIs) are the first class of quantum-topological materials ever discovered. They present an insulating gap in the bulk and linearly-dispersive 2-Dimensional Dirac metallic states at the surface [1]. After TIs, many other topological materials have been discovered, including magnetically-ordered 3D topological Insulators, Dirac-, Weyl- and Nodal-semimetals.
In this talk, I will review topological materials properties including their intriguing similitudes with some high-energy physics phenomena [2]. Moreover, I will discuss their linear [3] and non-linear optical properties [4, 5], suggesting some applications in photonics devices.
[1] J. E. Moore et al., Nature 464, 194 (2010);
[2] N.P. Armitage et al., Rev. Mod. Phys. 90, (2018);
[3] L. Tomarchio et al. NPG ASIA Materials, Accepted (2022);
[4] F.Giorgianni et al.,Nature Commun. 7, 1421 (2016);
[5] P. Di Pietro et al., Nature Nanotech. 8, 556 (2013).