Detuning-Controlled Internal Oscillations in an Exciton-Polariton Condensate

Voronova, N. S.; Elistratov, A. A.; Lozovik, Yu. E.

doi:10.1103/physrevlett.115.186402

Cited by 27 publications

(15 citation statements)

References 51 publications

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“…The condensate density is then no longer stationary in time. Here a plot of the polariton occupations in each trap, in figure 5(b), indicates ac Josephson-like oscillations between the detuned traps, with a running phase [20,35,47,50,51]. The TCMT and SSI exhibit excellent agreement in all three cases, which helps validate the preceding results of the two-mode TCMT.…”

Section: Comparisons With Ssisupporting

confidence: 75%

Competing role of interactions in synchronisation of exciton–polariton condensates

Khan

Türeci

2017

New J. Phys.

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We present a theoretical study of synchronisation dynamics of incoherently pumped excitonpolariton condensates in coupled polariton traps. Our analysis is based on a coupled-mode theory for the generalised Gross-Pitaevskii equation, which employs an expansion in non-Hermitian, pumpdependent modes appropriate for the pumped geometry. We find that polariton-polariton and reservoir-polariton interactions play competing roles and lead to qualitatively different synchronised phases of the coupled polariton modes as pumping power is increased. Crucially, these interactions can also act against each other to hinder synchronisation. We map out a phase diagram and discuss the general characteristics of these phases using a generalised Adler equation.

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Section: Comparisons With Ssisupporting

confidence: 75%

Competing role of interactions in synchronisation of exciton–polariton condensates

Khan

Türeci

2017

New J. Phys.

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“…and a † ba † a ≈ a † b a † a (this assumes that the states remain coherent states), the two observables are ruled by the following equations of motion [39,46]:…”

Section: Theorymentioning

confidence: 99%

“…The polariton implementation of Josephson effects is increasingly investigated [30][31][32][33][34][35][36][37][38]. Recently, it was observed that polaritons are predisposed for Josephson physics from the very nature of their light-matter composition [39], exhibiting the internal type of such Josephson dynamics where the exchange is not between two spatially separated condensates but between the two internal degrees of freedom that make up the polariton, namely, its exciton and photon components. This is an adequate picture, since condensates of polaritons are also condensates of photons and excitons [40], with their Rabi coupling acting as the tunneling.…”

Section: Introductionmentioning

confidence: 99%

Polaritonic Rabi and Josephson Oscillations

Rahmani

Laussy

2016

Sci Rep

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The dynamics of coupled condensates is a wide-encompassing problem with relevance to superconductors, BECs in traps, superfluids, etc. Here, we provide a unified picture of this fundamental problem that includes i) detuning of the free energies, ii) different self-interaction strengths and iii) finite lifetime of the modes. At such, this is particularly relevant for the dynamics of polaritons, both for their internal dynamics between their light and matter constituents, as well as for the more conventional dynamics of two spatially separated condensates. Polaritons are short-lived, interact only through their material fraction and are easily detuned. At such, they bring several variations to their atomic counterpart. We show that the combination of these parameters results in important twists to the phenomenology of the Josephson effect, such as the behaviour of the relative phase (running or oscillating) or the occurence of self-trapping. We undertake a comprehensive stability analysis of the fixed points on a normalized Bloch sphere, that allows us to provide a generalized criterion to identify the Rabi and Josephson regimes in presence of detuning and decay.

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“…[19][20][21][22]. Recently, however, also the non-interacting regime has proved to be topical, with reports of skyrmions analogues [23], band structure engineering [24] focusing and conical polariton diffraction [25], internal Bosonic Josephson junctions [26], emulates of oblique dark and half solitons [27], Z topological insulator [28] or the implementation of Hebbian learning in neural networks [29] to name a few but illustrative examples. In most of these cases, interactions bring the physics to even farther extents rather than spoiling the underlying linear effect, that remains nevertheless the one capturing the phenomenon.…”

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confidence: 99%

Self-Interfering Wave Packets

Colas

Laussy

2016

Phys. Rev. Lett.

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We study the propagation of non-interacting polariton wavepackets. We show how two qualitatively different concepts of mass that arise from the peculiar polariton dispersion lead to a new type of particle-like object from non-interacting fields-much like self-accelerating beams-shaped by the Rabi coupling out of Gaussian initial states. A divergence and change of sign of the diffusive mass results in a "mass wall" on which polariton wavepackets bounce back. Together with the Rabi dynamics, this yield propagation of ultrafast subpackets and ordering of a spacetime crystal.Field theory unifies the concepts of waves and particles [1]. In quantum physics, this brought at rest the dispute of the pre-second-quantization era, on the nature of the wavefunction. As one highlight of this conundrum, the coherent state emerged as an attempt by Schrödinger to prove Heisenberg that his equation is suitable to describe particles since some solutions exist that remain localized [2]. However, the reliance on an external potential and the lack of other particle properties-like resilience to collisions-makes this qualification a moot point and quantum particles are now understood as excitations of the field. The deep connection between fields and particles is not exclusively quantum and classical fields also provide a robust notion of particles, most famously with solitons [3]. The particle cohesion is here assured selfconsistently by the interactions, allowing free propagation and surviving collisions with other solitons (possibly with a phase shift). For a long time, this has been the major example of how to define a particle out of a classical field, until Berry and Balazs discovered the first case of a similar behaviour in a non-interacting context: the Airy beams [4]. These solutions to Schrödinger equation (or equivalently through the Eikonal approximation, to Maxwell equations) retain their shape as they propagate as a train of peaks (or sub-packets) and also exhibit self-healing after passing through an obstacle [5]. The ingredient powering these particle behaviours is phaseshaping, assuring the cohesion by the acceleration of the sub-packets inside the mother packet. The solution was first regarded as a mathematical curiosity as it is not normalizable, till a truncated version was experimentally realized and shown to exhibit this dramatic phenomenology but for a finite time [6]. The Airy beam is now a recognized particle-like object, in some cases emerging from fields that quantize elementary particles [7], thus behaving like a meta-particle. It is in fact but one example of a full family of so-called "accelerating beams" [8], that all similarly endow linear fields with particle properties: shape-preservation and resilience to collisions.In this Letter, we add another member to the family of mechanisms that provide non-interacting fields with particle properties. Namely, we show that two coupled fields of different masses can support self-interfering wavepack- Effective masses for the LPB as a function of momentum: in pur...

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Detuning-Controlled Internal Oscillations in an Exciton-Polariton Condensate

Cited by 27 publications

References 51 publications

Competing role of interactions in synchronisation of exciton–polariton condensates

Competing role of interactions in synchronisation of exciton–polariton condensates

Polaritonic Rabi and Josephson Oscillations

Self-Interfering Wave Packets

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