A1 Refereed original research article in a scientific journal
Spatial Coherence and Stability in a Disordered Organic Polariton Condensate
Authors: Daskalakis, Konstantinos S.; Maier S. A.; Kéna-Cohen S.
Publisher: American Physical Society (APS)
Publication year: 2015
Journal:Physical Review Letters
Journal name in sourcePhysical Review Letters
Journal acronym: PHYS REV LETT
Article number: 035301
Volume: 115
Issue: 3
Number of pages: 5
ISSN: 0031-9007
eISSN: 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.115.035301
Web address : https://doi.org/10.1103/physrevlett.115.035301
Abstract
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 Letter, 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.
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 Letter, 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.
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