19 research outputs found
Stability and spatial coherence of nonresonantly pumped exciton-polariton condensates
We investigate the stability and coherence properties of one-dimensional
exciton-polariton condensates under nonresonant pumping. We model the
condensate dynamics using the open-dissipative Gross-Pitaevskii equation. In
the case of spatially homogeneous pumping, we find that the instability of the
steady state leads to significant eduction of the coherence length. We consider
two effects that can lead to the stabilization of the steady state, i.e. the
polariton energy relaxation and the influence of an inhomogeneous pumping
profile. We find that, while the former has little effect on the stability, the
latter is very effective in stabilizing the condensate which results in a large
coherence length.Comment: 7 pages, 5 figure
Critical dynamics and tree-like spatiotemporal patterns in exciton-polaritoncondensates
We study nonresonantly pumped exciton-polariton system in the vicinity of the
dynamical instability threshold. We find that the system exhibits unique and
rich dynamics, which leads to spatiotemporal pattern formation. The patterns
have a tree-like structure and are reminiscent of structures that appear in a
variety of soft matter systems. Within the approximation of slow and fast time
scales, we show that the polariton model exhibits self-replication point in
analogy to reaction-diffusion systems
Publisher Correction: Single-shot condensation of exciton polaritons and the hole burning effect
Correction to: Nature Communications https://doi.org/10.1038/s41467-018-05349-4; published online: 9 August 2018
The original PDF version of this Article had an incorrect Published online date of 25 December 2018; it should have been 9 August 2018. This has been corrected in the PDF version of the Article. The HTML version was correct from the time of publication
Single-shot condensation of exciton polaritons and the hole burning effect
A bosonic condensate of exciton polaritons in a semiconductor microcavity is a macroscopic quantum state subject to pumping and decay. The fundamental nature of this driven-dissipative condensate is still under debate. Here, we gain an insight into spontaneous condensation by imaging long-lifetime exciton polaritons in a high-quality inorganic microcavity in a single-shot optical excitation regime, without averaging over multiple condensate realisations. We demonstrate that condensation is strongly influenced by an incoherent reservoir and that the reservoir depletion, the so-called spatial hole burning, is critical for the transition to the ground state. Condensates of photon-like polaritons exhibit strong shot-to-shot fluctuations and density filamentation due to the effective self-focusing associated with the reservoir depletion. In contrast, condensates of exciton-like polaritons display smoother spatial density distributions and are second-order coherent. Our observations show that the single-shot measurements offer a unique opportunity to study fundamental properties of non-equilibrium condensation in the presence of a reservoir
On the role of anisotropy of membrane components in formation and stabilization of tubular structures in multicomponent membranes.
Influence of isotropic and anisotropic properties of membrane constituents (nanodomains) on formation of tubular membrane structures in two-component vesicle is numerically investigated by minimization of the free energy functional based on the deviatoric-elasticity model of the membrane. It is shown that the lateral redistribution and segregation of membrane components may induce substantial change in membrane curvature resulting in the growth of highly curved tubular structures
The shapes of the vesicle composed of (iso+iso), (iso+aniso), and (aniso+aniso) components for , , , , .
<p>The shapes of the vesicle composed of (iso+iso), (iso+aniso), and (aniso+aniso) components for , , , , .</p