Exciton–polariton spin switches

Amo, A.; Liew, Timothy Chi Hin; Adrados, Christophe; Houdré, R.; Giacobino, E.; Kavokin, A. V.; Bramati, Alberto

doi:10.1038/nphoton.2010.79

Cited by 412 publications

(363 citation statements)

References 29 publications

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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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confidence: 84%

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: 84%

Polaritonic Feshbach resonance

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“…An alternative technology to overcome this limitation is an all photonic switching, in which a control light regulates the signal light through a passive non-linear medium. In all-photonic switching, until now, the passive non-linear medium has been based on complex quantum technologies such as plasmonic nanosystems, 1,2 quantum dots, 3,4 nanoscale photonic metamaterials 5,6 and multiple quantum wells, 7 etc. The main shortcomings are their narrow bandwidth and the difficulties in the integration of these complex structures.…”

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Ultrafast defect dynamics: A new approach to all optical broadband switching employing amorphous selenium thin films

et al. 2015

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Optical switches offer higher switching speeds than electronics, however, in most cases utilizing the interband transitions of the active medium for switching. As a result, the signal suffers heavy losses. In this article, we demonstrate a simple and yet efficient ultrafast broadband all-optical switching on ps timescale in the sub-bandgap region of the a-Se thin film, where the intrinsic absorption is very weak. The optical switching is attributed to short-lived transient defects that form localized states in the bandgap and possess a large electron-phonon coupling. We model these processes through first principles simulation that are in agreement with the experiments.

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“…These approaches involve various methods and features of polariton systems including parametric scattering [35] [power per gate/switch 9-40 mW, operation time 1 ns (theoretical)], hysteresis control [4] (∼30 mW, 5 ps switching + 1 ns recovery), resonant blue-shift [36] (∼5 mW, 1 ns), spin domain walls [14,17] [140 mW (pump) + 4.5 mW (probe), ∼70 ps], and polariton condensate bullets [33] (44 mW, 150 ps switching + 250 ps recovery). Compared with these studies, our procedure lies within the lower range of gate pump powers of a few mW.…”

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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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Exciton–polariton spin switches

Cited by 412 publications

References 29 publications

Polaritonic Feshbach resonance

Polaritonic Feshbach resonance

Ultrafast defect dynamics: A new approach to all optical broadband switching employing amorphous selenium thin films

Operation speed of polariton condensate switches gated by excitons

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