Extreme Light: 2D matter Interaction at the Atomic Scale

events hall

Dr. Itai Epstein

24.04.2022

David Wang Auditorium, 3rd floor Dalia Meidan Bldg.

14:30

Two-dimensional (2D) materials are atomically thin layers, which exhibit extraordinary optical and electrical properties. These atomic layers can be readily placed one on top of each other, forming Van der Waals heterostructures with programmable properties [1]. The optical response of 2D materials is especially remarkable, spanning over most of the electromagnetic spectrum [2], and involving a variety quasi-particle, such as excitons, plasmons, and phonons. From a technological point of view, the optical properties of 2D materials hold promise for the next generation of optoelectronic devices. In this talk, I will discuss two demonstrations of extreme interaction between light and quasi-particles supported by single atomic layers. In the first part, I will present record-breaking and close-to-unity light absorption by a monolayer semiconductor in the visible spectrum [3]. In the second part, I will introduce a new and efficient method for exciting extremely high momentum graphene-plasmons in the mid-infrared spectrum, with record-breaking mode confinement [4]. These approaches provide new platforms for studying ultra-strong light-matter interactions at the atomic scale and enable new possibilities for 2D materials-based optoelectronic devices.

Host: Asst. Prof. Joshua Grolman