Impact of dark superpositions on the relaxation dynamics of an optically driven phonon-coupled exciton-biexciton quantum-dot system

Glässl, Martin; Croitoru, M. D.; Vagov, Alexei; Axt, Vollrath M.; Kuhn, Tilmann

doi:10.1103/physrevb.85.195306

Cited by 12 publications

(20 citation statements)

References 30 publications

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“…Other many-particle techniques that have been applied to the dynamics and relaxation of QDs coupled to phonons cover Green-functions [140][141][142][143], multi-configuration time-dependent Hartree methods [142], time-dependent density functional theory [90,144] as well as path-integrals (PI) [97,145,146]. In particular, real-time PI methods have been widely used [21,[147][148][149][150][151][152][153][154][155][156][157]. With these methods it is possible to evaluate the reduced electronic density matrix for QD-phonon systems without approximation to the model.…”

Section: Theoretical Approachesmentioning

confidence: 99%

Distinctive characteristics of carrier-phonon interactions in optically driven semiconductor quantum dots

Reiter

Kuhn

Axt

2019

Advances in Physics: X

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We review distinct features arising from the unique nature of the carrier-phonon coupling in self-assembled semiconductor quantum dots. Because of the discrete electronic energy structure, the pure dephasing coupling usually dominates the phonon effects, of which two properties are of key importance: The resonant nature of the dot-phonon coupling, i.e. its nonmonotonic behavior as a function of energy, and the fact that it is of super-Ohmic type. Phonons do not only act destructively in quantum dots by introducing dephasing, they also offer new opportunities, e.g. in state preparation protocols. Apart from being an interesting model systems for studying fundamental physical aspects, quantum dot and quantum dot-microcavity systems are a hotspot for many innovative applications. We discuss recent developments related to the decisive impact of phonons on key figures of merit of photonic devices like single or entangled photon sources under aspects like indistinguishability, purity and brightness. All in all it follows that understanding and controlling the carrier-phonon interaction in semiconductor quantum dots is vital for their usage in quantum information technology.

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Section: Theoretical Approachesmentioning

confidence: 99%

Distinctive characteristics of carrier-phonon interactions in optically driven semiconductor quantum dots

Reiter

Kuhn

Axt

2019

Advances in Physics: X

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“…23 Therefore, only a three-level model is needed. 24 The idea of the adiabatic passage 25 is to drive the system state adiabatically along one of the spectral branches corresponding to the instantaneous eigenstates of the Hamiltonian H 0 = H X + H las .…”

Section: Modelmentioning

confidence: 99%

Dephasing in the adiabatic rapid passage in quantum dots: Role of phonon-assisted biexciton generation

et al. 2012

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We study the evolution of an exciton confined in a quantum dot adiabatically controlled by a frequency-swept (chirped) laser pulse in the presence of carrier-phonon coupling. We focus on the dynamics induced by a linearly polarized beam and analyze the decoherence due to phonon-assisted biexciton generation. We show that if the biexciton state is shifted down by a few meV, as is typically the case, then the resulting decoherence is strong even at low temperatures. As a result, efficient state preparation is restricted to a small parameter area corresponding to low temperatures, positive chirps, and moderate pulse areas.

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“…Already for laser-driven QDs without a cavity the phonon coupling leads to various remarkable dynamical features such as a nonmonotonic temperature dependence of the initial decay, 12 an undamping of ROs at high pulse areas, 13,14 and a crossover between two qualitatively different relaxation scenarios in an exciton-biexciton system. 15 Recent studies concerning the impact of acoustic phonons on QD cavity dynamics have revealed a surprisingly strong QD cavity coupling when the cavity is detuned from the QD resonance 16,17 and a pronounced spectral broadening of the Mollow sidebands through off-resonant cavity emission. 18,19 Furthermore, it has been predicted that the coupling of longitudinal optical phonons to a QD cavity system may induce a change from classical to nonclassical photon statistics.…”

Section: Introductionmentioning

confidence: 99%

Interaction of a quantum-dot cavity system with acoustic phonons: Stronger light-matter coupling can reduce the visibility of strong coupling effects

et al. 2012

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International audienceWe present a numerically complete study of the combined dynamics of a quantum dot exciton coupled to a single quantized cavity mode and a continuum of acoustic phonons. We demonstrate that acoustic phonons have a pronounced impact on effects characteristic of the strong light-matter coupling regime, such as vacuum Rabi oscillations and collapse and revival scenarios. This impact is considerable already at zero temperature, where initially no phonons are present. Counterintuitively it is found that an increase of the light-matter coupling does not necessarily enhance the visibility of strong-coupling effects. In fact, for typical experimental situations, a stronger light-matter coupling will considerably reduce the visibility

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Impact of dark superpositions on the relaxation dynamics of an optically driven phonon-coupled exciton-biexciton quantum-dot system

Cited by 12 publications

References 30 publications

Distinctive characteristics of carrier-phonon interactions in optically driven semiconductor quantum dots

Distinctive characteristics of carrier-phonon interactions in optically driven semiconductor quantum dots

Dephasing in the adiabatic rapid passage in quantum dots: Role of phonon-assisted biexciton generation

Interaction of a quantum-dot cavity system with acoustic phonons: Stronger light-matter coupling can reduce the visibility of strong coupling effects

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