Quantum degenerate phases of electron-hole systems in photoexcited semiconductors (Kosuke Yoshioka)

Friday 31 May 2013, 14:00 → 15:00 Asia/Tokyo

Main building, room 213 (RIKEN Wako)

Abstract: Photoexcited electrons and holes present rich variety of phases depending on the density and the temperature. An electron and a hole form a bosonic bound state called an exciton at low densities, like in atomic hydrogen or positonium. On the other hand, they exist as a fermionic, electron-hole plasma when the densities are sufficiently high. Thanks to the recent advances in spectroscopy, quantum degenerate states at low temperatures, which have been almost unresolved despite of the experimental efforts over 50 years, are now within our reach. In this talk, we will give an introduction of such characteristic phases for non-specialists: (i) Bose-Einstein condensation of excitons, (ii) electron-hole liquids, and (iii) few-body bound state of excitons called polyexcitons. Other SNP Seminars