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SUMMARY:Zone-Edge Lasing in Micro-Assembled Polariton Crystals
DTSTART:20130524T141500
DTSTAMP:20260510T105739Z
UID:281e8d265f400140ec1bd92b9ed1b4d1c50e85fd31c15a007c4fbe2b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Z. Chen\, State Key Laboratory of Surface Physics\, Key Labora
 tory of Micro and Nano Photonic Structures (Ministry of Education)\, Depar
 tment of Physics\, Fudan University\, Shanghai\nBand engineering in strong
 ly coupled light-matter systems opens new horizons of photonics and crysta
 l physics. Recent reports on Dirac bosons in triangular and honeycomb exci
 ton-polariton crystals show that new quasiparticles and new many-body phen
 omena can be found in semiconductor structures where a periodic potential 
 acting on mixed light-matter excitations strongly modifies their dispersio
 n relations. Till now\, polariton crystals were realized by chemical etchi
 ng or metal deposition on the top of planar microcavities. They provided p
 hotonic confinement\, and were operating at liquid helium temperature. Her
 e\, we realize the room-temperature polaritonic crystals by simple micro a
 ssembling: laying the one-dimensional ZnO microrods on a silicon slice wit
 h periodic pattern. We clearly observe band folding and gap formation whic
 h manifests appearance of a super-band structure for exciton-polaritons. M
 ost interestingly\, in the non-linear regime\, we observe polariton lasing
  from the edge of the Brillouin zone (π-state)\, which suggests a peculia
 r condensation mechanism in our system similar to "weak lasing" recently p
 roposed by Aleiner\, Altshuler and Rubo.\nReferences:\n1. Lai\, C. W. et a
 l. Coherent zero-state and -state in an exciton-polariton condensate array
 . Nature 450\, 529-533 (2007).\n2. Kim\, N. Y. et al\, Dynamical d-wave co
 ndensation of exciton–polaritons in a two-dimensional square-lattice pot
 ential\, Nature Physics\, 7\, 681-685 (2011).\n3. Kim，N. Y. et al\, Exci
 ton-polariton condensates near the Dirac point in a triangular lattice\, a
 rXiv:1210.2153\, (2012).\n4. Kusudo\, K. et al\, Stochastic Formation of P
 olariton Condensates in Two Degenerate Orbital States\, arXiv:1211.3833 (2
 012).\n5. I.L. Aleiner\, B.L. Altshuler and Y.G. Rubo\, Radiative Coupling
  and Weak Lasing of Exciton-Polariton Condensates\, Phys. Rev. B\, 85\, 12
 1301 (2012).
LOCATION:PH L1 503 http://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
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