Exciton-Photon Strong-Coupling Regime for a Single Quantum Dot Embedded in a Microcavity

Peter, Emmanuelle; Senellart, P.; Martrou, D.; Lemaı̂tre, A.; Hours, J.; Gérard, J. M.; Bloch, J.

doi:10.1103/physrevlett.95.067401

Cited by 755 publications

(578 citation statements)

References 33 publications

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“…A FDTD simulation of this mode predicts Q=81,000. Such a high Q-value would push a coupled dot-cavity system into the strong coupling regime [22,[93][94][95], where spontaneous emission is a reversible process such that the emitted photon could be reabsorbed by the dot before escaping the cavity. The system thus undergoes Rabi oscillations, allowing for the coherent transfer of quantum information between the photon and quantum dot.…”

Section: Microcavitiesmentioning

confidence: 99%

Directed self‐assembly of single quantum dots for telecommunication wavelength optical devices

Dalacu¹,

Reimer

Frédérick

et al. 2010

Laser & Photonics Reviews

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Strong confinement of charges in few electron systems such as in atoms, molecules and quantum dots leads to a spectrum of discrete energy levels that are often shared by several degenerate quantum states. Since the electronic structure is key to understanding their chemical properties, methods that probe these energy levels in situ are important. We show how electrostatic force detection using atomic force microscopy reveals the electronic structure of individual and coupled self-assembled quantum dots. An electron addition spectrum in the Coulomb blockade regime, resulting from a change in cantilever resonance frequency and dissipation during tunneling events, shows one by one electron charging of a dot. The spectra show clear level degeneracies in isolated quantum dots, supported by the first observation of predicted temperature-dependent shifts of Coulomb blockade peaks. Further, by scanning the surface we observe that several quantum dots may reside on what topologically appears to be just one. These images of grouped weakly and strongly coupled dots allow us to estimate their relative coupling strengths.

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Section: Microcavitiesmentioning

confidence: 99%

Directed self‐assembly of single quantum dots for telecommunication wavelength optical devices

Dalacu¹,

Reimer

Frédérick

et al. 2010

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…In the case of emission lines, this effect has already been investigated experimentally in symmetric QDs, where by analyzing the exciton line shape at different temperatures a strong deviation from the expected Lorentzian profile has been observed expressed in the appearance of low-energy acoustic-phonon sidebands [31][32][33][34]. In general, it is expected that an exciton confined in a larger quantum object should exhibit a weaker interaction with phonons [31,32,34,35]. This is due to the wave vector cutoff, approximately at the inverse of the structure size.…”

Section: Introductionmentioning

confidence: 99%

Phonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructures

et al. 2014

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The influence of acoustic phonons on the emission spectra of quantum dashes (QDashes), that are quasi-zerodimensional epitaxial nanostructures with significant shape anisotropy, is investigated both experimentally and theoretically. Photoluminescence (PL) spectra of single InAs/InGaAlAs/InP (001) QDashes exhibit sidebands of the main emission peak, clearly indicating the contribution of phonon-assisted emission to the exciton luminescence, which dominates the PL line shape at higher temperatures (between 50 and 100 K, usually). By utilizing the independent boson model we perform systematic and comprehensive studies of the influence of the overall geometry of quantum confinement on this spectral feature in an uncommon quantum system. A comparison of the experimental data and the results of modeling have confirmed the existence of two types of states differing in the spatial confinement and symmetry within one sample, i.e., typical for large elongated objects or characteristic for smaller and more symmetric structures. The latter are supposed to correspond to local widenings or zigzag bends present in some of the dashes and acting as additional localization centers, which confine excitons in a much smaller volume and decrease effectively the resulting in-plane anisotropy. Those observations evidence a nontrivial spatial character of the quantum confinement in these structures. They are consistent with our previous polarization-resolved study on the QDash ensemble and correlate well with the exciton decay times, and the spectral-diffusion-dominated line broadenings at low temperatures reflecting the effect of electric field fluctuations on the excitons of a different spatial extension. Finally, we demonstrate a pronounced suppression of phonon-induced decoherence for such strongly elongated nanostructures.

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“…In systems with integrated quantum emitters, predominantly the parameters of the cavity determine the interaction regime: In the weak light-matter coupling regime, the radiative lifetime of the emitter is altered by the presence of the cavity via Fermi's golden rule [6]. In contrast, if the light-matter interaction strength exceeds the cavity loss channels, the coherent regime of strong coupling is reached [7][8][9]. Both regimes have fundamental importance in the design of semiconductor devices with integrated quantum emitters (quantum dots) of the 'next generation' of photonic devices, such as efficient sources of single photons on demand [10][11][12], sources of entangled photon pairs [13], and sources of coherently generated and emitted single photons as demonstrated for atoms in optical cavities [14] .…”

Section: Introductionmentioning

confidence: 99%

Quantum dot micropillar cavities with quality factors exceeding 250,000

et al. 2016

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Abstract:We report on the spectroscopic investigation of quantum dot -micropillar cavities with unprecedented quality factors. We observe a pronounced dependency of the quality factor on the measurement scheme, and find that significantly larger quality factors can be extracted in photoreflectance compared to photoluminescence measurements. While the photoluminescence spectra of the microcavity resonances feature a Lorentzian lineshape and Q-factors up to 184,000 (±10,000), the reflectance spectra have a Fano-shaped asymmetry and feature significantly higher Q-factors in excess of 250,000 resulting from a full saturation of the embedded emitters. The very high quality factors in our cavities promote strong light-matter coupling with visibilities exceeding 0.5 for a single QD coupled to the cavity mode.

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Exciton-Photon Strong-Coupling Regime for a Single Quantum Dot Embedded in a Microcavity

Cited by 755 publications

References 33 publications

Directed self‐assembly of single quantum dots for telecommunication wavelength optical devices

Directed self‐assembly of single quantum dots for telecommunication wavelength optical devices

Phonon-assisted radiative recombination of excitons confined in strongly anisotropic nanostructures

Quantum dot micropillar cavities with quality factors exceeding 250,000

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