Effects of the non-parabolic kinetic energy on non-equilibrium polariton condensates

Pinsker, Florian; Ruan, Xinran; Alexander, Tristram J.

doi:10.1038/s41598-017-01113-8

Cited by 2 publications

(3 citation statements)

References 37 publications

(136 reference statements)

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“…. Finally we note that comparable linear waves have been derived in several scenarios and we refer to [5,6,51,55,60] for related results, however none include pumping dynamics.…”

Section: Impurity Wavesmentioning

confidence: 71%

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Beyond superfluidity in non-equilibrium Bose–Einstein condensates

Pinsker

2017

New J. Phys.

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The phenomenon of superfluidity in open Bose-Einstein condensates (BEC) is analysed numerically and analytically. It is found that a superfluid phase is feasible above the speed of sound, when forces due to inhomogeneous non-equilibrium processes oppose the contributions of homogeneous processes. Furthermore a regime of accelerating impurities can be observed for particular pumping/ decay strategies. All findings are derived within the complex Gross-Pitaevskii (GP) theory extended to include creation and annihilation terms. Utilising this framework the effective force acting on an impurity as it moves with velocity v through the open condensate can be calculated. The result shows that the drag force is continuously increasing with increasing velocity starting from the state of zero motion at v=0, a property that can be traced down to the additional homogeneous annihilation/ creation term in the extended GP model. For very large velocities however we observe a reversion of the drag force. Our findings stand in stark contrast to the concept of a topological phase transition to frictionless flow below a critical velocity as observed for equilibrium BEC analytically (Astrakharchik and Pitaevskii 2004 Phys. Rev. A 70 013608; Pinsker 2017 Physica B 521 36-42), numerically (Winiecki et al 1999 Phys. Rev. Lett. 82 26) and for trapped atoms experimentally (Desbuquois et al 2012 Nat. Phys. 8 645; Zwierlein et al 2006 Nature 442 54-58).

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“…. Finally we note that comparable linear waves have been derived in several scenarios and we refer to [5,6,51,55,60] for related results, however none include pumping dynamics.…”

Section: Impurity Wavesmentioning

confidence: 71%

“…) corresponding to GP theory or free particles [55]. Naturally GP theory is considered in 3d, however, reduction to lower dimensions occurs e.g.…”

Section: Condensate Wave Equationmentioning

confidence: 99%

Beyond superfluidity in non-equilibrium Bose–Einstein condensates

Pinsker

2017

New J. Phys.

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“…leads to Describe in detail. Due to a reversible spontaneous emission, the polariton spectrum splitting into an upper and lower branches, which for short are called 'upper polaritons' (UPs) and 'lower polaritons' (LPs) (Vladimirova, et al, 2010;Pinsker, et al, 2017). When the cavity-photon resonance is detuned to higher than that of the quantum well exciton (so called 'blue detuning'), LPs have a longer lifetime, and a shorter cooling time, facilitating thermalization (Deng, et al, 2010).…”

Section: Modelmentioning

confidence: 99%

Eksiton Polariton Yoğunlaşmasında Amplifikasyon Üzerinde Kontrol

Borisenok

2022

EJOSAT

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Exciton polariton condensates are the most well-studied case of Bose-Einstein condensation (BEC) of quasiparticles. Together with their prominent fundamental importance, the exciton-polariton condensates have a wide spectrum of engineering applications covering interferometry and metrology, different types of SQUIDs and accelerometers, and forming a universal gate set for quantum computing via the control with external laser pulses. The efficient experimental manipulation with the polariton BEC can be realized via the bosonic final-state stimulation, matter-wave amplification, or by lasing of polaritons, but a satisfactory theoretical model for such control has not been developed yet. Here we study the polariton matter-wave amplifier based on the stimulated scattering of massive particles. The amplification of the injected quasiparticles is achieved through an elastic scattering of so-called lower polaritons (LPs). Such an amplifier has many advantages compared with a standard lasing or using a photon amplifier: it can provide a sufficient gain coefficient. To develop an efficient control algorithm for the polariton amplifier we use here the dynamical model for the LP population proposed by Ciuti, Savona, et al. in 1998. The phenomenological model for the gain coefficient is based on the experiments with cold collisions of polaritons performed by Deng, Haug, and Yamamoto in 2010 and later. We use different feedback algorithms (speed gradient vs target attractor) to track efficiently the polariton population in the amplifier. We compare the pros and cons of our alternative approaches and discuss their possible engineering applications.

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Effects of the non-parabolic kinetic energy on non-equilibrium polariton condensates

Cited by 2 publications

References 37 publications

Beyond superfluidity in non-equilibrium Bose–Einstein condensates

Beyond superfluidity in non-equilibrium Bose–Einstein condensates

Eksiton Polariton Yoğunlaşmasında Amplifikasyon Üzerinde Kontrol

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