1,720,967 research outputs found
Zitterbewegung of exciton-polaritons
Full text linkMacroscopic wave packets of spin-polarized exciton-polaritons in two-dimensional microcavities experience the zitterbewegung, the effect manifested by the appearance of the oscillatory motion of polaritons in the direction normal to the initial propagation direction. The oscillating trajectories of exciton-polaritons are adjustable by the control parameters: the splitting of the longitudinal and transverse exciton-polariton modes, the wave vector, and the width of the resonant cw pump. Our theoretical analysis supported by the numerical calculations allowed us to optimize values of the control parameters suitable for a direct experimental observation of the zitterbewegung effect. © 2018 American Physical Societ
Zitterbewegung of exciton-polaritons
No full textMacroscopic wave packets of spin-polarized exciton-polaritons in two-dimensional microcavities experience the zitterbewegung, the effect manifested by the appearance of the oscillatory motion of polaritons in the direction normal to the initial propagation direction. The oscillating trajectories of exciton-polaritons are adjustable by the control parameters: the splitting of the longitudinal and transverse exciton-polariton modes, the wave vector, and the width of the resonant cw pump. Our theoretical analysis supported by the numerical calculations allowed us to optimize values of the control parameters suitable for a direct experimental observation of the zitterbewegung effect
Suppression of superfluidity of exciton-polaritons by magnetic field
No full textWe show that the properties of exciton-polariton condensate in a semiconductor microcavity are strongly sensitive to the external magnetic field normal to the cavity plane. In particular, the superfluidity is suppressed at a critical magnetic field Bc proportional to the polariton concentration. For B<Bc the Zeeman splitting of polaritons is exactly compensated by polariton–polariton interactions in the elliptically polarized condensate. Above the critical point, the spin degeneracy is lifted and the superfluidity reappears again on the circularly polarized lower polariton branch.<br/
Data for Engineering spatial coherence in lattices of polariton condensates
No full textExperimental data and numerical simulation results used to create the figures in the paper J. D. Töpfer, I. Chatzopoulos, H. Sigurdsson, T. Cookson, Y. G. Rubo, and P. G. Lagoudakis (2020), Engineering spatial coherence in lattices of polariton condensates, Optica.</span
Engineering spatial coherence in lattices of polariton condensates
No full textArtificial lattices of coherently coupled macroscopic states are at the heart of applications ranging from solving hard combinatorial optimization problems to simulating complex many-body physical systems. The size and complexity of the problems scale with the extent of coherence across the lattice. Although the fundamental limit of spatial coherence depends on the nature of the couplings and lattice parameters, it is usually engineering constraints that define the size of the system. Here, we engineer polariton condensate lattices with active control on the spatial arrangement and condensate density that results in near-diffraction limited emission, and spatial coherence that exceeds by nearly two orders of magnitude the size of each individual condensate. We use these advancements to unravel the dependence of spatial correlations between polariton condensates on the lattice geometry.</p
Nontrivial phase coupling in polariton multiplets
No full textData supporting the publication Ohadi, H.; Gregory, R. L.; Freegarde, T.; Rubo, Y. G.; Kavokin, A. V.; Berloff, N. G.; Lagoudakis, P. G., Nontrivial Phase Coupling in Polariton Multiplets. Physical Review X 2016, 6 (3), DOI: 10.1103/PhysRevX.6.031032</span
Nontrivial phase coupling in polariton multiplets
Full text linkWe investigate the phase coupling between spatially separated polariton condensates under nonresonant optical pulsed excitation. In the simple case of two condensates, we observe phase locking either in symmetric or antisymmetric states. We demonstrate that the coupling symmetry depends both on the separation distance and outflow velocity from the condensates. We interpret the observations through stimulated relaxation of polaritons to the phase configuration with the highest occupation. We derive an analytic criterion for the phase locking of a pair-polariton condensate and extend it to polariton multiplets. In the case of three condensates, we predict theoretically and observe experimentally either in-phase locking or the appearance of phase winding with phase differences of �2π/3 between neighbors. The latter state corresponds to a vortex of winding number �1 across the three polariton condensates
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Quantum statistics of bosonic cascades
No full textBosonic cascades formed by lattices of equidistant energy levels sustaining radiative transitions between nearest layers represent a unique system to study correlated optical phenomena. We show how the light emitted by condensates in the visible range introduces a new regime of emission for cascade systems. Namely, the quantum statistics of bosonic cascades exhibits superbunching plateaus. This demonstrates further potentialities of bosonic cascade lasers for the engineering of correlated properties of light useful for imaging applications
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