Amplitude-Mode Dynamics of Polariton Condensates

Brierley, Richard; Littlewood, P. B.; Eastham, P. R.

doi:10.1103/physrevlett.107.040401

Cited by 13 publications

(13 citation statements)

References 38 publications

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“…All-transb-carotene as an ideal molecule plays an important role in investigating the p-electron conjugated properties of the shortchain polymer molecule. Numerous studies have been carried out to characterize the physical properties of polyenes through several models, such as the coherent weakly damped electron-lattice vibration model [8], effective conjugation length model [9,10], effective conjugation coordinate model [11], and amplitude model [12,13]. In many studies, the resonance Raman scattering spectroscopy is often applied to investigate the structural characteristics of the molecule, which is one of the most useful methods to identify the phonon modes coupled to an electronic system [14].…”

Section: Introductionmentioning

confidence: 99%

The electron–phonon coupling of fundamental, overtone, and combination modes and its effects on the resonance Raman spectra

Wang

et al. 2015

Materials Research Bulletin

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Section: Introductionmentioning

confidence: 99%

The electron–phonon coupling of fundamental, overtone, and combination modes and its effects on the resonance Raman spectra

Wang

et al. 2015

Materials Research Bulletin

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“…Theoretically, a lot of progress has been made for BEC of magnons and exciton-polaritons [13][14][15][16][17][18][19]. Although the observation of Bose-Einstein condensation of photons is more recent, it has also motivated theoretical studies: Klaers et al predicted a regime of large fluctuations of the condensate number [20].…”

Section: Introductionmentioning

confidence: 99%

Schwinger-Keldysh theory for Bose-Einstein condensation of photons in a dye-filled optical microcavity

2013

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We consider Bose-Einstein condensation of photons in an optical cavity filled with dye molecules that are excited by laser light. By using the Schwinger-Keldysh formalism we derive a Langevin field equation that describes the dynamics of the photon gas and, in particular, its equilibrium properties and relaxation towards equilibrium. Furthermore we show that the finite lifetime effects of the photons are captured in a single dimensionless damping parameter that depends on the power of the external laser pumping the dye. Finally, as applications of our theory we determine spectral functions and collective modes of the photon gas in both the normal and the Bose-Einstein condensed phases.

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“…Most recent research [27][28][29][30] fueled by experimental breakthroughs [25,31,32] investigates nonadiabatic dynamics of s-wave BCS superconductors in response to fast electromagnetic perturbations. Closely related subjects developing in parallel are exciton dynamics [33], collective neutrino oscillations [34,35], quenched p-wave superfluids [36,37], etc.…”

Section: Introductionmentioning

confidence: 99%

Quantum quench phase diagrams of ans-wave BCS-BEC condensate

et al. 2015

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We study the dynamic response of an s-wave BCS-BEC (atomic-molecular) condensate to detuning quenches within the two-channel model beyond the weak-coupling BCS limit. At long times after the quench, the condensate ends up in one of three main asymptotic states (nonequilibrium phases), which are qualitatively similar to those in other fermionic condensates defined by a global complex order parameter. In phase I the amplitude of the order parameter vanishes as a power law, in phase II it goes to a nonzero constant, and in phase III it oscillates persistently. We construct exact quench phase diagrams that predict the asymptotic state (including the many-body wave function) depending on the initial and final detunings and on the Feshbach resonance width. Outside of the weak-coupling regime, both the mechanism and the time dependence of the relaxation of the amplitude of the order parameter in phases I and II are modified. Also, quenches from arbitrarily weak initial to sufficiently strong final coupling do not produce persistent oscillations in contrast to the behavior in the BCS regime. The most remarkable feature of coherent condensate dynamics in various fermion superfluids is an effective reduction in the number of dynamic degrees of freedom as the evolution time goes to infinity. As a result, the long-time dynamics can be fully described in terms of just a few new collective dynamical variables governed by the same Hamiltonian only with "renormalized" parameters. Combining this feature with the integrability of the underlying (e.g., the two-channel) model, we develop and consistently present a general method that explicitly obtains the exact asymptotic state of the system.

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Amplitude-Mode Dynamics of Polariton Condensates

Cited by 13 publications

References 38 publications

The electron–phonon coupling of fundamental, overtone, and combination modes and its effects on the resonance Raman spectra

The electron–phonon coupling of fundamental, overtone, and combination modes and its effects on the resonance Raman spectra

Schwinger-Keldysh theory for Bose-Einstein condensation of photons in a dye-filled optical microcavity

Quantum quench phase diagrams of ans-wave BCS-BEC condensate

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