Spatial Coherence and Stability in a Disordered Organic Polariton Condensate
| Autor: | Konstantinos S. Daskalakis, Stefan A. Maier, Stéphane Kéna-Cohen |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Optics and Photonics
Physics Multidisciplinary FOS: Physical sciences General Physics and Astronomy 02 engineering and technology Bose-Einstein condensation 01 natural sciences Measure (mathematics) law.invention Scattering law Phase (matter) 0103 physical sciences Modulation (music) Cadmium Compounds Polariton 010306 general physics Physics Photons Science & Technology Condensed matter physics Lasers Condensation Models Theoretical 021001 nanoscience & nanotechnology Vortex Interferometry Quantum Gases (cond-mat.quant-gas) Physical Sciences Tellurium Condensed Matter - Quantum Gases Microcavity 0210 nano-technology Electromagnetic Phenomena Bose–Einstein condensate |
| Zdroj: | Physical Review Letters. 115 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Although only a handful of organic materials have shown polariton condensation, their study is rapidly becoming more accessible. The spontaneous appearance of long-range spatial coherence is often recognized as a defining feature of such condensates. In this work, we study the emergence of spatial coherence in an organic microcavity and demonstrate a number of unique features stemming from the peculiarities of this material set. Despite its disordered nature, we find that correlations extend over the entire spot size and we measure $g^{(1)}(r,r')$ values of nearly unity at short distances and of 50% for points separated by nearly 10 $\mu$m. We show that for large spots, strong shot to shot fluctuations emerge as varying phase gradients and defects, including the spontaneous formation of vortices. These are consistent with the presence of modulation instabilities. Furthermore, we find that measurements with flat-top spots are significantly influenced by disorder and can, in some cases, lead to the formation of mutually incoherent localized condensates. Comment: Revised version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|