Lens-shaped all-epitaxial quantum dot microcavity

We present a novel semiconductor structure in which 0D polaritons coexist with 2D microcavity polaritons. Spatial trapping of the 2D microcavity polaritons results from the confinement of their photonic part in a potential well, consisting of an adjustable thickness variation of the spacer layer. This original technique allows to create polaritonic boxes of any size and shape. Strong coupling regime is evidenced by the typical energy level anticrossing, in real space and in momentum space, and supported by a theoretical model.Semiconductor heterostructures allow the analysis of light-matter interaction in nanoscopic or mesoscopic systems, in which properties of both uncoupled light and matter oscillators can be strongly engineered. Beyond the motivation of the realization of optoelectronic devices, monitoring of light by matter and vice versa has already led to a wide range of new fascinating physics. Of particular interest is the strong coupling regime, where the dressed states basis becomes the relevant one to describe and understand the coupled system. Historic experiments of quantum electrodynamics have been realized using a few atoms in the strong coupling regime with a few cavity photons [1,2]. In strong analogy, three groups have recently reported the successful achievement of strong coupling regime for one single Quantum Dot (QD) with a high-quality factor (Q) cavity mode [3][4][5]. In these systems the small number of electronic excitations opens the way to the realization of solid state devices for quantum information operation.Research on solid state systems has also been motivated, during the last 50 years, by the possibility to achieve Bose-Einstein condensation (BEC) at high temperature. This effect involves a huge number of particles, that massively accumulate into a single quantum state below a critical temperature, thus displaying macroscopical quantum properties. To reach this goal, the most promising candidates are microcavity polaritons, eigenstates of semiconductor microcavities in strong coupling regime [6]. These quasiparticles have the great advantage over excitons to exhibit a very light effective mass. Their bosonic behavior at low density has been demonstrated already by final state stimulation in parametric scattering process [7], and by direct evidence of quantum degeneracy [8]. Rather high temperatures have been reached for such effects [9]. However, polariton BEC has not been demonstrated yet. A more favorable situation for BEC should be obtained by confining the polaritons within a small volume, as suggested by

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“…[17], although the growth induced asymmetry seems to be much more pronounced, probably due to different growth conditions.…”

Section: Originalmentioning

confidence: 99%

Zero dimensional exciton‐polaritons

Baas¹,

Daïf

Richard

et al. 2006

Physica Status Solidi (b)

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“…Of course, this same Hamiltonian can be used to describe a variety of other configurations, e.g. solid-state planar microcavities with a suitable lateral patterning [29,30], or even hybrid setups with a spherical fiber-tip mirror facing a planar DBR mirror [31].…”

Section: Model Systemmentioning

confidence: 99%

Many-body braiding phases in a rotating strongly correlated photon gas

Umucalılar¹,

Carusotto²

2013

Physics Letters A

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We present a theoretical study of fractional quantum Hall physics in a rotating gas of strongly interacting photons in a single cavity with a large optical nonlinearity. Photons are injected into the cavity by a Laguerre-Gauss laser beam with a non-zero orbital angular momentum. The Laughlin-like few-photon eigenstates appear as sharp resonances in the transmission spectra. Using additional localized repulsive potentials, quasi-holes can be created in the photon gas and then braided around in space: an unambiguous signature of the many-body Berry phase under exchange of two quasi-holes is observed as a spectral shift of the corresponding transmission resonance.

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“…-Zero-dimensional polariton dots [19][20][21] are characterized by a strong spatial confinement of the polariton wavefunction in all three dimensions, which gives rise to a series of discrete polariton states. In typical experimental set-ups, the in-plane confinement of polaritons is obtained by suitably designing a photonic structure whose discrete photonic eigenmodes have a small transverse mode profile.…”

mentioning

confidence: 99%

Feshbach blockade: Single-photon nonlinear optics using resonantly enhanced cavity polariton scattering from biexciton states

Carusotto

Volz

İmamoğlu

2010

EPL

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Abstract. -We theoretically demonstrate how the resonant coupling between a pair of cavitypolaritons and a biexciton state can lead to a large single-photon Kerr nonlinearity in a semiconductor solid-state system. A fully analytical model of the scattering process between a pair of cavity-polaritons is developed, which explicitly includes the biexcitonic intermediate state. A dramatic enhancement of the polariton-polariton interactions is predicted in the vicinity of the biexciton Feshbach resonance. Application to the generation of non-classical light from polariton dots is discussed.A number of quantum optical applications crucially rely on having a strong value of the effective photon-photon interaction mediated by the optical nonlinearity of the atomic or solid-state medium. The most interesting quantum physics appears in fact when the presence of a single photon is sufficient to significantly modulate the response of a device. As a simplest example, a stream of strongly antibunched photons is emitted by a cavity as soon as the nonlinear shift of the resonance by a single photon is larger than the cavity linewidth [1,3]. This physics is even more intriguing when more complex devices are considered: photons have been predicted to fermionize into Tonks-Girardeau gases as soon as the impenetrability condition is satisfied in a one-dimensional geometry. To this end, both strongly nonlinear optical fibers [4] and arrays of many coupled nonlinear cavities [5] have been considered. Quantum phase transitions between a coherent phase of "superfluid" photons to a Mott insulator one have also attracted a significant interest [6]. So far, the main obstacle against an experimental realization of all these phenomena has been the lack of scalable optical devices with sufficiently large nonlinearities and weak enough losses.A great deal of the recent advances in the field of strongly correlated atomic gases have been made possible by the discovery of the so-called Feshbach resonance effect in atomatom collisions [7]: the scattering cross section is dramatically enhanced when the energy of the pair of colliding atoms is resonant with a long-lived quasi-bound molecular state. In typical experiments, an external magnetic field is used to tune the energy of the quasi-bound (a)

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Lens-shaped all-epitaxial quantum dot microcavity

Cited by 15 publications

References 13 publications

Zero dimensional exciton‐polaritons

Zero dimensional exciton‐polaritons

Many-body braiding phases in a rotating strongly correlated photon gas

Feshbach blockade: Single-photon nonlinear optics using resonantly enhanced cavity polariton scattering from biexciton states

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