Polariton-polariton interaction constants in microcavities

Vladimirova, Maria; Cronenberger, Steeve; Scalbert, D.; Kavokin, K. V.; Miard, A.; Lemaı̂tre, A.; Bloch, J.; Solnyshkov, D. D.; Malpuech, Guillaume; Kavokin, Alexey

doi:10.1103/physrevb.82.075301

Cited by 203 publications

(216 citation statements)

References 28 publications

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“…The results are modelled by numerical simulations based on a meanfield two-channel model that includes coupling between polaritons and biexcitons as a key ingredient. It is worth mentioning that several works [19][20][21][22] have already reported observations of coupling between polaritons and biexcitons without reaching the regime of the Feshbach resonance reported here.The expected signatures of the Feshbach resonance phenomenon are twofold. First, a strong variation of the strength and sign of the scattering amplitude; second, a reduction of the free particle density through the coupling with the molecular bound state.…”

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confidence: 96%

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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Polaritonic Feshbach resonance

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“…Quantum signatures are expected at occupancies about or below unity and are therefore suppressed in typical experimental regimes [27] which do not favor the so-called unconventional blockade mechanism [33]. Moreover the single-particle nonlinearity is typically much smaller than the mode's linewidth [34], even for strong confinements down to a few micrometers, which forbids the realization of a standard polariton blockade [22].…”

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confidence: 99%

Nonclassical statistics from a polaritonic Josephson junction

Flayac

Savona

2017

Phys. Rev. A

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We theoretically study the emission statistics of a weakly nonlinear photonic dimer during coherent oscillations. We show that the phase and population dynamics allow to periodically meet an optimal squeezing condition resulting in a strongly nonclassical emission statistics. By considering an exciton-polariton Josephson junction driven resonantly by a pulsed classical source, we show that a sizable antibunching should emerge in such a semiconductor system where intrinsic nonclassical signatures have remained elusive to date.

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“…[19][20][21][22][23][24] The interaction strength is spin dependent; [25][26][27] excitons with parallel spins experience a repulsive force, while the interaction between excitons with anti-parallel spin is weaker and can be attractive in nature. 28 In this work, we show that these anisotropic interactions allow the construction of a photonic analogue of current spin polarization as in a ferromagnet. Namely, we demonstrate spin polarization control of a polariton condensate signal using an optical gate in a high-finesse microcavity ridge.…”

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Spin selective filtering of polariton condensate flow

Gao

Antón

Liew

et al. 2015

Applied Physics Letters

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Spin-selective spatial filtering of propagating polariton condensates, using a controllable spin-dependent gating barrier, in a one-dimensional semiconductor microcavity ridge waveguide is reported. A nonresonant laser beam provides the source of propagating polaritons, while a second circularly polarized weak beam imprints a spin dependent potential barrier, which gates the polariton flow and generates polariton spin currents. A complete spin-based control over the blocked and transmitted polaritons is obtained by varying the gate polarization. The generation of spin currents from the passage of electrons through ferromagnets is an important building-block for spintronic devices. For example, magnetic random access memory has developed from the spin valve concept, in which the current through a pair of ferromagnets is strongly attenuated when the magnets have opposite orientations. 1 This principle has a striking analogy in optics, where the attenuation of light passing through crossed polarizes also leads to information processing devices such as spatial light modulators based on liquid crystals. 2 Indeed analogies between spintronics and optics led to the emerging field of spinoptronics, 3 aiming to exploit a hybridization of the different fields.This hybridization is well illustrated by semiconductor microcavities in the strong coupling regime, which have become a promising basis for all-optical devices and circuits. [4][5][6][7][8] The strong coupling regime gives rise to excitonpolaritons (for simplicity, polaritons), whose light mass and integer spin facilitates condensation at elevated temperatures. 9,10 The excitonic fraction leads to strong carrier-carrier interactions 11 and sensitivity to gating electromagnetic fields. 12 At the same time, the photonic fraction allows the spin state of the polariton to be directly imprinted onto the polarization of the emitted light. An advantage over conventional spintronic devices is that, being neutral particles, polaritons do not experience strong dephasing due to Coulomb scattering and the coherent propagation of spin currents can be achieved over hundreds of microns. 13 Optically controlled carrier-carrier interactions in strongly coupled semiconductor microcavities have been shown to be a highly effective tool in the engineering of polaritons' energy landscapes, 14 for both the study of polariton condensate phenomena [15][16][17][18] and the realization of nascent polariton devices. [19][20][21][22][23][24] The interaction strength is spin dependent; 25-27 excitons with parallel spins experience a repulsive force, while the interaction between excitons with anti-parallel spin is weaker and can be attractive in nature. 28 In this work, we show that these anisotropic interactions allow the construction of a photonic analogue of current spin polarization as in a ferromagnet. Namely, we demonstrate spin polarization control of a polariton condensate signal using an optical gate in a high-finesse microcavity ridge. A schematic of the device is shown in Fig. 1(a)

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Polariton-polariton interaction constants in microcavities

Cited by 203 publications

References 28 publications

Polaritonic Feshbach resonance

Polaritonic Feshbach resonance

Nonclassical statistics from a polaritonic Josephson junction

Spin selective filtering of polariton condensate flow

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