Ultrafast tristable spin memory of a coherent polariton gas

Cerna, R.; Léger, Yoan; Paraïso, Taofiq K.; Wouters, Michiel; Morier‐Genoud, F.; Portella‐Oberli, M. T.; Deveaud, B.

doi:10.1038/ncomms3008

Cited by 104 publications

(105 citation statements)

References 41 publications

(44 reference statements)

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“…The different excitonic content of both polarization states results in asymmetric spinor interactions. Such spinor interactions offer a wide range of effects and a very rich physics to explore in semiconductor microcavities [13][14][15][16][17][18] .In this work, we demonstrate a Feshbach resonance in a polariton semiconductor microcavity. Feshbach biexcitonic resonant scattering is investigated through spectrally resolved circularly polarized pump-probe spectroscopy on a III-V based microcavity (Methods).…”

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Polaritonic Feshbach resonance

et al. 2014

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A Feshbach resonance occurs when the energy of two interacting free particles comes into resonance with a molecular bound state. When approaching this resonance, marked changes in the interaction strength between the particles can arise. Feshbach resonances provide a powerful tool for controlling the interactions in ultracold atomic gases, which can be switched from repulsive to attractive [1][2][3][4] , and have allowed a range of many-body quantum physics e ects to be explored 5,6 . Here we demonstrate a Feshbach resonance based on the polariton spinor interactions in a semiconductor microcavity. By tuning the energy of two polaritons with anti-parallel spins across the biexciton bound state energy, we show an enhancement of attractive interactions and a prompt change to repulsive interactions. A mean-field two-channel model quantitatively reproduces the experimental results. This observation paves the way for a new tool for tuning polariton interactions and to move forward into quantum correlated polariton physics.A semiconductor microcavity is a unique system where exciton-polaritons emerge from the strong coupling between an exciton and a photon. The demonstration of Bose-Einstein condensation of exciton-polaritons in a semiconductor microcavity 7 has attracted much attention and opened a wide field of research on polariton quantum fluids, such as superfluidity 8 , quantum vortices 9 and Bogoliubov dispersion [10][11][12] . Many more examples could be proposed to highlight the fact that polaritons provide a concrete realization of a bosonic interacting many-body quantum system, complementing the work performed on ultracold atom systems.Furthermore, polaritons exhibit a polarization degree of freedom, with a one-to-one connection to two counter circular polarizations for their photonic part. The different excitonic content of both polarization states results in asymmetric spinor interactions. Such spinor interactions offer a wide range of effects and a very rich physics to explore in semiconductor microcavities [13][14][15][16][17][18] .In this work, we demonstrate a Feshbach resonance in a polariton semiconductor microcavity. Feshbach biexcitonic resonant scattering is investigated through spectrally resolved circularly polarized pump-probe spectroscopy on a III-V based microcavity (Methods). To bring the energy of a two-lower polariton state into resonance with the biexciton state we change the cavity exciton detuning (Fig. 1a,c). We evidence the resonant polariton scattering by probing the anti-parallel spin polariton interactions when scanning the two-polariton energy across the bound biexciton state. We clearly show the enhancement of polariton interactions and the change of their character from attractive to repulsive. Moreover, we observe a decrease of the polariton resonance amplitude when the lower polariton energy is in the vicinity of the biexciton energy. The results are modelled by numerical simulations based on a meanfield two-channel model that includes coupling between polaritons and biexcito...

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confidence: 99%

Polaritonic Feshbach resonance

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“…A remarkable range of spinrelated phenomena has been explored in systems with a coherent resonant optical pump, which offers the possibility to directly inject the spin state of exciton-polaritons and explore the ultrafast spin-switching dynamics [3][4][5][6] . On the contrary, the non-resonant incoherent excitation responsible for the spontaneous formation of coherent exciton-polariton condensates is only beginning to be experimentally explored in the context of spin-dependent effects.…”

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Incoherent excitation and switching of spin states in exciton-polariton condensates

Liew

Egorov

et al. 2015

Phys. Rev. B

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We investigate, theoretically and numerically, the spin dynamics of a two-component excitonpolariton condensate created and sustained by non-resonant spin-polarized optical pumping of a semiconductor microcavity. Using the open-dissipative mean-field model, we show that the existence of well defined phase-locked steady states of the condensate may lead to efficient switching and control of spin (polarization) states with a non-resonant excitation. Spatially inhomogeneous pulsed excitations can cause symmetry breaking in the pseudo-spin structure of the condensate and lead to formation of non-trivial spin textures. Our model is universally applicable to two weakly coupled polariton condensates, and therefore can also describe the behaviour of condensate populations and phases in 'double-well' type potentials.

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“…Their comparatively lighter mass makes the condensation easier regarding the temperature [2]. Optical devices incorporating such condensates are promising candidates for new ultrafast, low-power consuming information processing components [3][4][5]. Different structures, including one-dimensional ones, have been proposed recently for the realization of transistors [6,7], diodes [8], optical routers [9], spin current controllers [10], logic gates [11], and for building a universal set of logic AND-and NOT-type gates [12].…”

Section: Introductionmentioning

confidence: 99%

Operation speed of polariton condensate switches gated by excitons

et al. 2014

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We present a time-resolved photoluminescence (PL) study in real and momentum space of a polariton condensate switch in a quasi-one-dimensional semiconductor microcavity. The polariton flow across the ridge is gated by excitons inducing a barrier potential due to repulsive interactions. A study of the device operation dependence on the power of the pulsed gate beam obtains a satisfactory compromise for the on-off signal ratio and switching time of the order of 0.3 and ∼50 ps, respectively. The opposite transition is governed by the long-lived gate excitons, consequently, the off-on switching time is ∼200 ps, limiting the overall operation speed of the device to ∼3 GHz. The experimental results are compared to numerical simulations based on a generalized Gross-Pitaevskii equation, taking into account incoherent pumping, decay, and energy relaxation within the condensate.

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Ultrafast tristable spin memory of a coherent polariton gas

Cited by 104 publications

References 41 publications

Polaritonic Feshbach resonance

Polaritonic Feshbach resonance

Incoherent excitation and switching of spin states in exciton-polariton condensates

Operation speed of polariton condensate switches gated by excitons

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