Room-temperature exciton polaritons in monolayer WS2
Prof. Elena Ostrovskaya,
The Australian National University, Canberra, Australia
24/02/2022, 12:00 MSK / 10:00 CET
Abstract
Monolayer transition metal dichalcogenide crystals (TMDCs) hold great promise for semiconductor optoelectronics because their excitons are stable at room temperature and interact strongly with light. When TMDCs are embedded in an optical microcavity, their excitons can hybridise with cavity photons to form exciton polaritons. In this talk, I will review our work on room-temperature WS2 exciton polaritons in a high-quality all-dielectric microcavity. In particular, I will discuss the effects of strong motional narrowing of the exciton-polariton spectrum, enhancement of macroscopic phase coherence and long-range ballistic propagation. Finally, I will describe a new approach for engineering a trapping potential for TMDC polaritons by making use of ultrathin Ga2O3 glass, and highlight the effects of trapping on the exciton-polariton properties.
About the speaker
Ostrovskaya obtained her MSc degree in Physics from Moscow State University in 1993 and PhD in Physics from the Australian National University (ANU) in 1999. She is currently a Professor and Associate Director (Research) in the Research School of Physics at ANU. Ostrovskaya was trained as a theoretical physicist specialising in nonlinear dynamics of photonic systems and matter waves. In 2013, she established, and is currently leading, an experimental group working in the field of exciton-polariton physics: https://polaritonbec.org/. The ANU Polariton BEC group’s research is focusing on fundamental properties and potential device applications of exciton polaritons in III-V (GaAs) and novel 2D transition metal dichalcogenide (TMD) semiconductors.
Date & Location
Date & Location
The event will be taking place on the 24th of February 2021 at 12:00 MSK time (10:00 CET).
Access details: Zoom (Meeting ID: 962 4930 8286 / Passcode: 457552)
Event mailing list
To receive updates about the Polaritonics Seminar Series, please register to our mailing list here.
All seminar of the Polaritonics Seminar are opened the broader scientific community.