Half-skyrmion spin textures in polariton microcavities

Cilibrizzi, Pasquale; Sigurðsson, H.; Liew, Timothy Chi Hin; Ohadi, Hamid; Askitopoulos, Alexis; Brodbeck, Sebastian; Schneider, Christian; Shelykh, I. A.; Hoefling, Sven; Ruostekoski, Janne; Lagoudakis, Pavlos G.

doi:10.1103/physrevb.94.045315

Cited by 40 publications

(44 citation statements)

References 58 publications

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“…According to our simulation, the typical rate at which data can be fed into each lattice site and processed efficiently is one byte (understood as a unit of information) every few tens of picoseconds. This estimation is in agreement with numerous time-resolved experiments in polariton systems performed in the nonlinear regime [46][47][48][49][50] . In contrast to single site RC systems, here signal processing is performed at N 2 nodes in a truly parallel manner.…”

Section: Resultssupporting

confidence: 91%

Neuromorphic Computing in Ginzburg-Landau Polariton-Lattice Systems

et al. 2019

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The availability of large amounts of data and the necessity to process it efficiently have led to rapid development of machine learning techniques. To name a few examples, artificial neural network architectures are commonly used for financial forecasting, speech and image recognition, robotics, medicine, and even research. Direct hardware for neural networks is highly sought for overcoming the von Neumann bottleneck of software implementations. Reservoir computing (RC) is a recent and increasingly popular bio-inspired computing scheme which holds promise for an efficient temporal information processing. We demonstrate the applicability and performance of reservoir computing in a general complex Ginzburg-Landau lattice model, which adequately describes dynamics of a wide class of systems, including coherent photonic devices. In particular, we propose that the concept can be readily applied in exciton-polariton lattices, which are characterized by unprecedented photonic nonlinearity, opening the way to signal processing at rates of the order of 1 Tbit s −1 .

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Section: Resultssupporting

confidence: 91%

Neuromorphic Computing in Ginzburg-Landau Polariton-Lattice Systems

et al. 2019

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“…top hat or Gaussian spot excitation) the scattering processes within the reservoir suppress externally imposed spin imbalances. However even in such cases, careful analysis of the spatiotemporal polarization dynamics have shown spin phenomena that are driven by the spin imbalance in the exciton reservoir, such as polariton spin whirls and intricate spin textures [34,36].…”

Section: Resultsmentioning

confidence: 99%

Nonresonant optical control of a spinor polariton condensate

et al. 2016

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We investigate the spin dynamics of polariton condensates spatially separated from and effectively confined by the pumping exciton reservoir. We obtain a strong correlation between the ellipticity of the non-resonant optical pump and the degree of circular polarisation (DCP) of the condensate at the onset of condensation. With increasing excitation density we observe a reversal of the DCP. The spin dynamics of the trapped condensate are described within the framework of the spinor complex Ginzburg-Landau equations in the Josephson regime, where the dynamics of the system are reduced to a current-driven Josephson junction. We show that the observed spin reversal is due to the interplay between an internal Josephson coupling effect and the detuning of the two projections of the spinor condensate via transition from a synchronised to a desynchronised regime. These results suggest that spinor polariton condensates can be controlled by tuning the non-resonant excitation density offering applications in electrically pumped polariton spin switches.

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“…Today, growing attention is paid to pattern formation due to spin-sensitive interaction of polaritons. In particular, the circular-polarization degree of the light wave transmitted through or emitted by the microcavity can be varied in space and time [15][16][17][18][19][20]. Spin patterns usually form as a result of artificial or random structural disorder or space-dependent driving field ( [21][22][23][24][25]).…”

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Polariton Chimeras: Bose-Einstein Condensates with Intrinsic Chaoticity and Spontaneous Long-Range Ordering

Gavrilov

2018

Phys. Rev. Lett.

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The system of cavity polaritons driven by a plane electromagnetic wave is found to undergo the spontaneous breaking of spatial symmetry, which results in a lifted phase locking with respect to the driving field and, consequently, in the possibility of internal ordering. In particular, periodic spin and intensity patterns arise in polariton wires; they exhibit strong long-range order and can serve as media for signal transmission. Such patterns have the properties of dynamical chimeras: they are formed spontaneously in perfectly homogeneous media and can be partially chaotic. The reported new mechanism of chimera formation requires neither time-delayed feedback loops nor nonlocal interactions.

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Half-skyrmion spin textures in polariton microcavities

Cited by 40 publications

References 58 publications

Neuromorphic Computing in Ginzburg-Landau Polariton-Lattice Systems

Neuromorphic Computing in Ginzburg-Landau Polariton-Lattice Systems

Nonresonant optical control of a spinor polariton condensate

Polariton Chimeras: Bose-Einstein Condensates with Intrinsic Chaoticity and Spontaneous Long-Range Ordering

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