The 1st RAP Edge Photonics Seminar
Event Outline
| Title | Unravelling the nature of excitons and their close cousins in momentum space |
|---|---|
| Speaker | Prof. Keshav M. DANI, Okinawa Institute of Science and Technology (OIST) |
| Date | Monday, May 25, 2026 |
| Opening hours | 16:00 – 17:00 |
| Venue | Room W524-525, 5F, Cooperation Center, Wako Campus, RIKEN （Participation via Zoom is also available.） |
| Language | English |
| Attendance fee | Free |
| Contact | |
| More Infomation | The 1st RAP Edge Photonics Seminar |
Registration
Please register using the link below.
Online participation via Zoom is available.
(Access information will be sent to you after completing the registration.)
https://krs2.riken.jp/m/registration_1st_edgephotonics
Abstract
Excitons are the primary optical excitations in semiconductors and insulators. They are critical in understanding the optical response of a variety of materials and devices. In 2D materials, due to the strong Coulomb interaction, excitons dominate the optical properties even at room temperature. Since their discover in the 1930s, experimental studies on excitons have largely used optical methods, and thus been unable to access their momentum coordinates and related information. Recently, it became possible to measure the momentum coordinate distribution of the internal electron and hole that constitute the exciton, thus revealing rich physics about the exciton and their close cousins [1, 2, 3, 4, 5, 6]
In this talk, I will present the latest results in my lab in studying the momentum coordinate of excitons and other related particles.
[1] J. Madeo, M.K.L. Man et al., Science 370, 1199 (2020)
[2] M.K.L. Man, J. Madeo, et al. Science Advances 7(17), eabg0192 (2021)
[3] O. Karni, E. Barre, V. Pareek, et al. Nature 603, 247 (2022)
[4] O. Karni, I. Esin and K.M. Dani, Adv. Materials 35(27), 2204120 (2023)
[5] Z. Zhu, D.R. Bacon, V.Pareek, et al. Nature Comm. 16, 6385 (2025)
[6] V Pareek, D.R. Bacon, X.Zhu, et al. Nature Physics 22, 209 (2026)