Strongly interacting dipolar-polaritons

Rosenberg, Itamar; Liran, Dror; Mazuz-Harpaz, Yotam; West, K. W.; Pfeiffer, L. N.; Rapaport, Ronen

doi:10.48550/arxiv.1802.01123

Cited by 4 publications

(9 citation statements)

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“…However such an estimate does not account for the spin characteristics of excitons, induced dipole moment of the DX exciton, and the contribution of exchange to the IX interactions [4,5,26,27]. We emphasize that our experiments, that are carried out using resonant excitation in a microcavity with coupled quantum well structures yields a much smaller increase compared to recent measurements under non-resonant excitation obtained with induced dipoles in wide quantum wells embedded in waveguide structures [3].…”

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confidence: 72%

“…One way to enhance interactions is to engineer polaritonic excitations with a permanent dipole moment [1]: such dipolar polaritons emerge as elementary optical excitations when DXs in a quantum well (QW) are strongly coupled to both microcavity photons and indirect dipolar excitons. A number of studies have shown that interactions between polaritons can be enhanced by increasing the size of the optically induced dipole in a wide QW [2,3], or alternatively, the indirect exciton (IX) content [4,5]. The structure we employ in our experiment allows us to tune the IX content and to increase the ratio of the interaction strength of polaritons to their linewidth without substantially compromising the exciton-photon coupling strength.…”

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confidence: 99%

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Enhanced Interactions between Dipolar Polaritons

Togan¹,

Lim²,

Faelt³

et al. 2018

Phys. Rev. Lett.

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Nonperturbative coupling between cavity photons and excitons leads to formation of hybrid light-matter excitations termed polaritons. In structures where photon absorption leads to creation of excitons with aligned permanent dipoles [1-3], the elementary excitations, termed dipolar polaritons, are expected to exhibit enhanced interactions [4, 5]. Here, we report a substantial increase in interaction strength between dipolar polaritons as the size of the dipole is increased by tuning the applied gate voltage. To this end, we use coupled quantum well structures embedded inside a microcavity where coherent electron tunneling between the wells controls the size of the excitonic dipole. Modifications of the interaction strength are characterized by measuring the changes in the reflected intensity of light when polaritons are driven with a resonant laser. Factor of 6.5 increase in the interaction strength to linewidth ratio that we obtain indicates that dipolar polaritons could be used to demonstrate a polariton blockade effect [6] and thereby form the building blocks of many-body states of light [7].

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confidence: 72%

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confidence: 99%

Enhanced Interactions between Dipolar Polaritons

Togan¹,

Lim²,

Faelt³

et al. 2018

Phys. Rev. Lett.

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“…Interesting further studies involve the differing behaviors in other optical accessable phase transitions, like purely photonic condensates [46], polariton condensates in equilibrium in ultra-high quality samples [47] and even Frenkel exciton condensates for which different interactions are proposed [48]. Samples with very strong polariton interactions [49,50] will also allow fascinating explorations of strong-correlations through the full particlenumber distribution. With the study and comparison of these systems, this powerful new photon-number resolving sensor enables to investigate in a new light the role of the interaction present at differing strength levels for each mentioned system.…”

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confidence: 99%

Photon-Number-Resolved Measurement of an Exciton-Polariton Condensate

et al. 2018

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We measure the full photon-number distribution emitted from a Bose condensate of microcavity exciton polaritons confined in a micropillar cavity. The statistics are acquired by means of a photon-number-resolving transition edge sensor. We directly observe that the photon-number distribution evolves with the nonresonant optical excitation power from geometric to quasi-Poissonian statistics, which is canonical for a transition from a thermal to a coherent state. Moreover, the photon-number distribution allows one to evaluate the higher-order photon correlations, shedding further light on the coherence formation and phase transition of the polariton condensate. The experimental data are analyzed in terms of thermal-coherent states, which gives direct access to the thermal and coherent fraction from the measured distributions. These results pave the way for a full understanding of the contribution of interactions in light-matter condensates in the coherence buildup at threshold.

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“…This allows an electrical control of the polariton signal 16 and results in a significant electrically controlled enhancement of the mutual interactions between WG-polaritons. 20,21 Therefore, flying WG-polaritons can be excellent candidates for polariton-based circuitry, due to the simple access to local control of both the light and the matter parts of the polaritons, where a complex spatial control can be potentially designed and achieved by methods as simple as single-layer shallow etching or simple deposition processes. Until now, all experiments in WG-polaritons were done in a slab-WG geometry, with no lateral optical confinement, where polaritons are confined only in one dimension.…”

Section: Introductionmentioning

confidence: 99%

Fully Guided Electrically Controlled Exciton Polaritons

et al. 2018

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We demonstrate two types of waveguide structures which optically confine excitonpolaritons in two dimensions and act as polaritonic channels. We show a strong optical confinement in an etched rectangular waveguide, that significantly increases the propagation distance of the polaritons and allow to direct them in curved trajectories. Also, we show low-loss optical guiding over a record-high of hundreds of microns which is combined seamlessly with electrical control of the polaritons, in a strip waveguide formed by electrically conductive and optically transparent strips deposited on top of a planar waveguide. Both structures are scalable and easy to fabricate and offer new possibilities for designing complex polaritonic devices.

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Strongly interacting dipolar-polaritons

Cited by 4 publications

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Enhanced Interactions between Dipolar Polaritons

Enhanced Interactions between Dipolar Polaritons

Photon-Number-Resolved Measurement of an Exciton-Polariton Condensate

Fully Guided Electrically Controlled Exciton Polaritons

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