Zone-Edge Lasing in Micro-Assembled Polariton Crystals
Event details
| Date | 24.05.2013 |
| Hour | 14:15 |
| Speaker | Z. Chen, State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Fudan University, Shanghai |
| Location | |
| Category | Conferences - Seminars |
Band engineering in strongly coupled light-matter systems opens new horizons of photonics and crystal physics. Recent reports on Dirac bosons in triangular and honeycomb exciton-polariton crystals show that new quasiparticles and new many-body phenomena can be found in semiconductor structures where a periodic potential acting on mixed light-matter excitations strongly modifies their dispersion relations. Till now, polariton crystals were realized by chemical etching or metal deposition on the top of planar microcavities. They provided photonic confinement, and were operating at liquid helium temperature. Here, we realize the room-temperature polaritonic crystals by simple micro assembling: laying the one-dimensional ZnO microrods on a silicon slice with periodic pattern. We clearly observe band folding and gap formation which manifests appearance of a super-band structure for exciton-polaritons. Most interestingly, in the non-linear regime, we observe polariton lasing from the edge of the Brillouin zone (π-state), which suggests a peculiar condensation mechanism in our system similar to "weak lasing" recently proposed by Aleiner, Altshuler and Rubo.
References:
1. Lai, C. W. et al. Coherent zero-state and -state in an exciton-polariton condensate array. Nature 450, 529-533 (2007).
2. Kim, N. Y. et al, Dynamical d-wave condensation of exciton–polaritons in a two-dimensional square-lattice potential, Nature Physics, 7, 681-685 (2011).
3. Kim，N. Y. et al, Exciton-polariton condensates near the Dirac point in a triangular lattice, arXiv:1210.2153, (2012).
4. Kusudo, K. et al, Stochastic Formation of Polariton Condensates in Two Degenerate Orbital States, arXiv:1211.3833 (2012).
5. I.L. Aleiner, B.L. Altshuler and Y.G. Rubo, Radiative Coupling and Weak Lasing of Exciton-Polariton Condensates, Phys. Rev. B, 85, 121301 (2012).
References:
1. Lai, C. W. et al. Coherent zero-state and -state in an exciton-polariton condensate array. Nature 450, 529-533 (2007).
2. Kim, N. Y. et al, Dynamical d-wave condensation of exciton–polaritons in a two-dimensional square-lattice potential, Nature Physics, 7, 681-685 (2011).
3. Kim，N. Y. et al, Exciton-polariton condensates near the Dirac point in a triangular lattice, arXiv:1210.2153, (2012).
4. Kusudo, K. et al, Stochastic Formation of Polariton Condensates in Two Degenerate Orbital States, arXiv:1211.3833 (2012).
5. I.L. Aleiner, B.L. Altshuler and Y.G. Rubo, Radiative Coupling and Weak Lasing of Exciton-Polariton Condensates, Phys. Rev. B, 85, 121301 (2012).
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez, Raphaël Butté and Woflgang Harbich)
Contact
- Prof. E. Kapon (LPN)