Dephasing effects on coherent exciton-polaritons and the breakdown of the strong coupling regime

Takemura, Naotomo; Anderson, Mitchell D.; Trebaol, Stéphane; Biswas, S.; Oberli, D. Y.; Portella‐Oberli, M. T.; Deveaud, B.

doi:10.1103/physrevb.92.235305

Cited by 12 publications

(20 citation statements)

References 44 publications

(74 reference statements)

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“…For this purpose, we propose polaritonic Bloch equations (PBEs), which is the polaritonic basis version of the EBEs presented in Refs. [9,10].…”

Section: Methodsmentioning

confidence: 99%

“…The exciton interaction constants are the same as in Ref. [9]: g pae = 0.3g 0 . The pure dephasing and EID strength for the upper polariton are γ * UU = 0.1 meV and g UU = 0.8g 0 .…”

Section: Theorymentioning

confidence: 99%

“…2(b) and 3(b), respectively. For these simulations, x and γ c are set to be 0.01 meV and 0.1 meV, respectively [9]. Since we introduce dephasing only for the upper polariton, we set γ * x = 0 and g = 0.…”

Section: Theorymentioning

confidence: 99%

“…While many of these phenomena can be captured by the Gross-Pitaevskii equations, which are equations of motion of the coherent polariton wave function, it is well known that incoherent excitons also play a crucial role in the modification of the temporal dynamics of polaritons. We have previously shown that when polariton branches at k ∼ 0 are coherently excited by a spectrally broad laser pulse, the coherent exciton polarization converts into incoherent exciton population due to both pure and excitation induced dephasing (EID) [9]; this process is best described using excitonic Bloch equations (EBEs) [10]. However, since the excitonic Bloch equations are written in the exciton-photon basis and not the natural basis of the system (i.e., polariton basis), they cannot fully capture some of the complex dynamics arising from the distinct polariton branches.…”

Section: Introductionmentioning

confidence: 99%

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Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities

et al. 2016

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The interaction between coherent polaritons and incoherent excitons plays an important role in polariton physics. Using resonant pump-probe spectroscopy with selective excitation of single polariton branches, we investigate the different dephasing mechanisms responsible for generating a long-lived exciton reservoir. As expected, pumping the upper polariton results in a strong dephasing process that leads to the generation of a long lived reservoir. Unexpectedly, we observe an efficient reservoir creation while exciting only the lower polariton branch when the detuning is increased towards positive detuning. We propose a simple theoretical model, the polaritonic Bloch equations, to describe the dynamics of the system.

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“…For this purpose, we propose polaritonic Bloch equations (PBEs), which is the polaritonic basis version of the EBEs presented in Refs. [9,10].…”

Section: Methodsmentioning

confidence: 99%

“…The exciton interaction constants are the same as in Ref. [9]: g pae = 0.3g 0 . The pure dephasing and EID strength for the upper polariton are γ * UU = 0.1 meV and g UU = 0.8g 0 .…”

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities

et al. 2016

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“…The appearance of the middle polariton line should in no case be considered as an indication of the transition to the weak coupling regime [16] and the saturation of the exciton transition. This is confirmed by the following: a) all three lines coexist at a given time and THz intensity; b) simultaneous energy shift of LP, UP and MP with increasing THz intensity (the energy of cavity photon is independent on the THz intensity); c) the MP energy depends on the THz power ( Fig.…”

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confidence: 99%

Doubly Dressed Bosons: Exciton Polaritons in a Strong Terahertz Field

Piętka¹,

Bobrovska²,

Stephan³

et al. 2017

Phys. Rev. Lett.

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We demonstrate the existence of a novel quasiparticle: an exciton in a semiconductor doubly dressed with two photons of different wavelengths: near infrared cavity photon and terahertz (THz) photon, with the THz coupling strength approaching the ultra-strong coupling regime. This quasiparticle is composed of three different bosons, being a mixture of a matter-light quasiparticle. Our observations are confirmed by a detailed theoretical analysis, treating quantum mechanically all three bosonic fields. The doubly dressed quasiparticles retain the bosonic nature of their constituents, but their internal quantum structure strongly depends on the intensity of the applied terahertz field.The research on light -matter interaction in the strong coupling regime, when quantum light emitter and photons can coherently exchange energy, before the coherence is lost, is one of the fundamental problems in cavity quantum electrodynamics (QED). This problem was widely adopted in an atom -cavity system, described within renowned Jaynes-Cummings model and even beyond this limit, in the ultra-strong coupling regime. The system based on exciton-polaritons, quasiparticles composed from excitons in a semiconductor strongly coupled to the vacuum light field in the cavity, has many advantages. These quantum light emitters do not show fermion-like statistics, but are truly designed bosons that can exhibit non-equilibrium Bose-Einstein phase transition [1]. In the present manuscript, we study the phenomenon of double dressing: an exciton coupled to two photonic fields from distinct energy ranges: near-infrared (NIR) and terahertz (THz), which bares no direct analogy in atomic physics.Excitons, or bound electron-hole pairs, can be created by the absorption of a near infrared (NIR) photon in a semiconductor. The strong coupling [2-4] of excitons and photons in a high-quality microcavity structure results in the formation of exciton-polaritons, due to vacuum field Rabi coupling, evidenced by the appearance of lower polariton (LP) and upper polariton (UP) resonances [5]. The strong coupling regime can be achieved when the coupling strength is larger than the decoherence and the correct description of the system is in terms of new quantum eigenstates, or dressed quasiparticles. In a quantum well (QW), which confines the exciton into a plane, the internal structure of the exciton resembles that of a two-dimensional hydrogen atom. The transitions between the internal states lie in the THz range of the electromagnetic spectrum. The possibility to induce such transitions with THz photons was shown in Refs. 6-8. Upon intense THz illumination, close to the 1s-2p excitonic transition, Autler-Townes splitting of excitonic states has been observed [1, 9].In this letter we demonstrate the simultaneous dressing of excitons with NIR and THz photons. We observe the appearance of a third dressed polariton mode, the middle polariton (MP), which is accompanied by an energy shift of the upper and lower polariton states. We describe our observations with a quant...

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Polariton interactions in semiconductor microcavities

Deveaud

2016

Comptes Rendus. Physique

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In this review, we will try to summarize the results that we have obtained on the measurement of polariton interactions. We will describe here the samples, the experimental systems and some of the important results. We will also give a few highlights on the theoretical description of these results. One of the main topics of this review will be the observation of the Feshbach resonance for polaritons, and its interpretation through the coupling of two lower polaritons into a biexciton.

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Dephasing effects on coherent exciton-polaritons and the breakdown of the strong coupling regime

Cited by 12 publications

References 44 publications

Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities

Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities

Doubly Dressed Bosons: Exciton Polaritons in a Strong Terahertz Field

Polariton interactions in semiconductor microcavities

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