Polaritronics in view

Deveaud-Plédran, Benoît

doi:10.1038/453297a

Cited by 20 publications

(17 citation statements)

References 9 publications

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“…This allowed the observations of the optical spin Hall effect 10 , or of half-quantum vortices 11 , which have shown that polaritons exhibit remarkable spin carrier properties. Finally, recent realizations of optical bistability 12,13 and electrical injection in polariton diodes 14 allow the implementation of low-power polaritronic devices working at room temperature 15,16 . Spin multistability refers to the possibility for a system to present three or more stable spin states for a given excitation condition.…”

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Multistability of a coherent spin ensemble in a semiconductor microcavity

et al. 2010

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Coherent manipulation of spin ensembles is a key issue in the development of spintronics. In particular, multivalued spin switching may lead to new schemes of logic gating and memories. This phenomenon has been studied with atom vapours 30 years ago, but is still awaited in the solid state. Here, we demonstrate spin multistability with microcavity polaritons in a trap. Owing to the spinor nature of these light-matter quasiparticles and to the anisotropy of their interactions, we can optically control the spin state of a single confined level by tuning the excitation power, frequency and polarization. First, we realize high-efficiency power-dependent polarization switching. Then, at constant excitation power, we evidence polarization hysteresis and determine the conditions for realizing multivalued spin switching. Finally, we demonstrate an unexpected regime, where our system behaves as a high-contrast spin trigger. These results open new pathways to the development of advanced spintronics devices and to the realization of multivalued logic circuits. Spin manipulation is the object of an intense research activity in a great variety of solid-state systems [1][2][3] . Owing to significant advances in tunability and miniaturization, semiconductor nanostructures have turned into ideal laboratories to address spintronics challenges 4 . In this respect, microcavity polaritons hold great potential 5,6 . Arising from the normal-mode coupling between cavity photons and quantum-well excitons, polaritons behave as bosons and possess unique coherence properties that have led to the demonstration of Bose-Einstein condensation and superfluidity [7][8][9] . A great advantage of polaritons is the one-to-one correspondence between the polariton spin and the polarization of the emitted light. This allowed the observations of the optical spin Hall effect 10 , or of half-quantum vortices 11 , which have shown that polaritons exhibit remarkable spin carrier properties. Finally, recent realizations of optical bistability 12,13 and electrical injection in polariton diodes 14 allow the implementation of low-power polaritronic devices working at room temperature 15,16 . Spin multistability refers to the possibility for a system to present three or more stable spin states for a given excitation condition. It requires precise control of coherence and interactions and is therefore difficult to realize. The only successful studies of multistability with a spinor system were carried out with atomic vapours 30 years ago 17,18 . Its demonstration in the solid state would clearly lead to new schemes of spin-based logic devices 19,20 . Microcavity polaritons were recently predicted to be promising candidates to explore spin multistability 21 . This phenomenon rapidly emerged as an innovative solution for the design of spin memory elements 22 , and for the realization of logic gates based on the selective transport of spin-polarized polaritons 23,24 . Such developments first require an experimental demonstration of spin multistability in a pattern...

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Multistability of a coherent spin ensemble in a semiconductor microcavity

et al. 2010

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“…The HQVs are also shown to be capable of long-distance propagation without dephasing. Insight into and control over polariton quantum degrees of freedom opens the perspective of quantum device operation and sets the basis of the new fascinating field of polaritronics 33 .…”

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confidence: 99%

Dissociation dynamics of singly charged vortices into half-quantum vortex pairs

et al. 2012

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The quest for identification and understanding of fractional vorticity is a major subject of research in the quantum fluids domain, ranging from superconductors, superfluid Helium-3 to cold atoms. In a two-dimensional Bose degenerate gas with a spin degree of freedom, the fundamental topological excitations are fractional vortical entities, called half-quantum vortices. Convincing evidence for the existence of half-quantum vortices was recently provided in spinor polariton condensates. The half-quantum vortices can be regarded as the fundamental structural components of singly charged vortices but, so far, no experimental evidence of this relation has been provided. Here we report on the direct and time-resolved observation of the dynamical process of the dissociation of a singly charged vortex into its primary components, a pair of half-quantum vortices. The physical origin of the observed phenomenology is found in a spatially inhomogeneous static potential that couples the two spin components of the condensate.

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“…17 Excitonpolaritons are mixed light-matter quasiparticles responsible for fascinating non-linear optical effects in semiconductors including polariton lasing, Bose-Einstein condensation and are promising for applications in so-called polaritronics. 18 Exciton-polaritons in amorphous dielectrics have not been studied experimentally until now, while, theoretically, nothing prevents their formation and propagation in glasses. Propagation of exciton-polaritons can be understood as a chain of virtual absorption-emission acts, and it does not imply motion of individual excitons, in general.…”

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“…The reported effect of polaritonic self-assembly will open new opportunities for material structuring and control at subwavelength scales and shows the high potentiality of polaritronics. 18 M. Beresna, M. Gecevičius, and P. G. Kazansky acknowledge support from EPSRC and the EU project FEM-TOPRINT. T. Taylor and A. V. Kavokin acknowledge support from EPSRC and the EU project ITN CLERMONT4.…”

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Exciton mediated self-organization in glass driven by ultrashort light pulses

et al. 2012

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Local ab initio methods for calculating optical bandgaps in periodic systems. II. Periodic density fitted local configuration interaction singles method for solids J. Chem. Phys. 137, 204119 (2012) Quantum coherence effects in hybrid nanoparticle molecules in the presence of ultra-short dephasing times Appl. Phys. Lett. 101, 213102 (2012) Photoluminescence study of magnetic spin clusters and their temperature evolution in Cd0.70Mn0.30Te spinglass compound J. Appl. Phys. 112, 093715 (2012) Excitonic luminescence in two-dimensionally confined layered sulfide oxides

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Polaritronics in view

Cited by 20 publications

References 9 publications

Multistability of a coherent spin ensemble in a semiconductor microcavity

Multistability of a coherent spin ensemble in a semiconductor microcavity

Dissociation dynamics of singly charged vortices into half-quantum vortex pairs

Exciton mediated self-organization in glass driven by ultrashort light pulses

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