Expert in: Collective excitations in electronic structure of nanoscale materials
Directeur de département, Professeur titulaire
- Condensed matter: elecronic structure, electrical, magnetic, and optical properties
- Condensed matter physics
- Excitons and related phenomena
- Collective excitations in electronic structure of nanoscale materials
- Photoluminescence of III-V and II-VI semiconductors
- Optical properties of nanoscale materials and structures
- Optical properties of quantum wells
- Raman spectra of III-V and II-VI semiconductors
- Time resolved spectroscopy
When a semiconductor material absorbs a photon, an electron is excited into the conduction band, leaving a hole in the valence band. The Coulomb interaction between the electron and the hole generates a bound state called an exciton, which largely controls the optical properties of semiconductors. In addition, when the environment is structured on a nanometric scale, the optical response of the semiconductors is radically altered by quantum confinement.
My research program revolves around the dynamics of excitons when they are created in nanostructured environments, so as to describe how the energy is absorbed and redistributed as part of a representation in terms of collective excitations. Although the subject is fundamental in nature, it is closely related to the development of excitonics, an emergent field that aims to design and manufacture better optical devices for applications ranging from lighting to quantum computing.