Interferometric correlation spectroscopy in single quantum dots

Kammerer, C.; Cassabois, Guillaume; Voisin, Christophe; Perrin, Mickael L.; Delalande, Claude; Roussignol, Philippe; Gerard, Jean‐Michel

doi:10.1063/1.1510158

Cited by 85 publications

(85 citation statements)

References 16 publications

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“…The emission line is centered at 1.375 eV at 10K, and its profile remains Lorentzian in the investigated range of incident power and temperature, as can be seen in Fig. 1(a) from the exponential decay of the interferogram contrasts C(τ ) recorded by Fourier-transform spectroscopy [18]. This behavior contrasts with the one reported in Ref.…”

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Temperature dependence of the zero-phonon linewidth in quantum dots: An effect of the fluctuating environment

et al. 2007

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“…The excitation beam is provided by a He:Ne laser and we perform PL measurements under nonresonant excitation at 1.96 eV. Both shape and width of the emission line of single QDs are analyzed by highresolution Fourier-transform spectroscopy [18].…”

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Temperature dependence of the zero-phonon linewidth in quantum dots: An effect of the fluctuating environment

et al. 2007

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“…The relaxation times to the QD ground states are thus often only attributed to the capture time. Nevertheless, intra-dot relaxation processes, although secondary in the population relaxation, play a very important role in the coherence relaxation [12,13].…”

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Photoneutralization and slow capture of carriers in quantum dots probed by resonant excitation spectroscopy

et al. 2013

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We investigate experimentally and theoretically the resonant emission of single InAs/GaAs quantum dots in a planar microcavity. Due to the presence of at least one residual charge in the quantum dots, the resonant excitation of the neutral exciton is blocked. The influence of the residual doping on the initial quantum dots charge state is analyzed, and the resonant emission quenching is interpreted as a Coulomb blockade effect. The use of an additional non-resonant laser in a specific low power regime leads to the carrier draining in quantum dots and allows an efficient optical gating of the exciton resonant emission. A detailed population evolution model, developed to describe the carrier draining and the optical gate effect, perfectly fits the experimental results in the steady state and dynamical regimes of the optical gate with a single set of parameters. We deduce that ultra-slow Auger-and phonon-assisted capture processes govern the carrier draining in quantum dots with relaxation times in the 1 -100 µs range. We conclude that the optical gate acts as a very sensitive probe of the quantum dots population relaxation in an unprecedented slow-capture regime.

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“…[11]. In order to accurately characterize the quantum dot emission spectrum, the photoluminescence signal arising from a single quantum dot is analyzed by high-resolution Fourier-transform spectroscopy [11].…”

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Unconventional motional narrowing in the optical spectrum of a semiconductor quantum dot

et al. 2006

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Motional narrowing refers to the striking phenomenon where the resonance line of a system coupled to a reservoir becomes narrower when increasing the reservoir fluctuation. A textbook example is found in nuclear magnetic resonance, where the fluctuating local magnetic fields created by randomly oriented nuclear spins are averaged when the motion of the nuclei is thermally activated. The existence of a motional narrowing effect in the optical response of semiconductor quantum dots remains so far unexplored. This effect may be important in this instance since the decoherence dynamics is a central issue for the implementation of quantum information processing based on quantum dots. Here we report on the experimental evidence of motional narrowing in the optical spectrum of a semiconductor quantum dot broadened by the spectral diffusion phenomenon. Surprisingly, motional narrowing is achieved when decreasing incident power or temperature, in contrast with the standard phenomenology observed for nuclear magnetic resonance.PACS numbers: 78.67. Hc, 78.55.Cr, In the seminal work on motional narrowing by Bloembergen et al., relaxation effects in nuclear magnetic resonance were beautifully explained by taking into account the influence of the thermal motion of the magnetic nuclei upon the spin-spin interaction [1]. The general treatment of relaxation processes for a system interacting with a reservoir was later formulated by Kubo in a stochastic theory that assumes random perturbations of the system by a fluctuating environment [2]. Depending on the relative magnitude of the spectral modulation amplitude and the inverse of the modulation correlation time, the relaxation dynamics is either in the slow modulation limit, where the optical line-shape reflects directly the statistical distribution of the different system energies, or in the fast modulation limit where the fluctuation is smoothed out and the line-shape is motionally narrowed into a Lorentzian profile. The relevance of motional narrowing for the description of relaxation phenomena has spread throughout many different fields, such as spin relaxation in semiconductors [3], vibrational dephasing in molecular physics [4], or phase noise in optical pumping [5].The optical spectrum of a material system with localized, zero-dimensional electronic states provides a generic example of the influence of a fluctuating environment on the coherence relaxation dynamics. In that case, the perturbing interactions induce a stochastic shift over time of the optical spectrum, resulting in the so-called spectral diffusion effect, which was observed for rare-earth ions [6], molecules [7], or semiconductor quantum dots [8,9]. In this latter system, impurities, defects or localized charges in the vicinity of a quantum dot induce micro-electric fields that shift the quantum dot emission line through the quantum confined Stark effect. The fluctuation of the quantum dot environment thus randomize the emission energy over a spectral range Σ on a characteristic time scale τ c . Spectral dif...

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Interferometric correlation spectroscopy in single quantum dots

Cited by 85 publications

References 16 publications

Temperature dependence of the zero-phonon linewidth in quantum dots: An effect of the fluctuating environment

Temperature dependence of the zero-phonon linewidth in quantum dots: An effect of the fluctuating environment

Photoneutralization and slow capture of carriers in quantum dots probed by resonant excitation spectroscopy

Unconventional motional narrowing in the optical spectrum of a semiconductor quantum dot

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