Superradiance of quantum dots

Scheibner, Michael; Schmidt, Thomas; Worschech, L.; Forchel, A.; Bacher, G.; Passow, T.; Hommel, D.

doi:10.1038/nphys494

Cited by 470 publications

(407 citation statements)

References 27 publications

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“…Correlations of the intensity can be used to quantitatively study these fluctutations and these are the subject of this paper. Some aspects of the noise properties of continuously pumped, collectively emitting systems have also been discussed recently in the context of collectively radiating low dimensional solid state systems [10,11]. For instance Temnov and Woggon studied the photon statistics deep in the subradiant regime in [12].…”

Section: Introductionmentioning

confidence: 99%

Intensity fluctuations in steady-state superradiance

2010

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Alkaline-earth like atoms with ultra-narrow optical transitions enable superradiance in steady state. The emitted light promises to have an unprecedented stability with a linewidth as narrow as a few millihertz. In order to evaluate the potential usefulness of this light source as an ultrastable oscillator in clock and precision metrology applications it is crucial to understand the noise properties of this device. In this paper we present a detailed analysis of the intensity fluctuations by means of Monte-Carlo simulations and semi-classical approximations. We find that the light exhibits bunching below threshold, is to a good approximation coherent in the superradiant regime, and is chaotic above the second threshold.

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Section: Introductionmentioning

confidence: 99%

Intensity fluctuations in steady-state superradiance

2010

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“…For this phenomenon he coined the term superradiance and showed that the atom ensemble can behave as a large collective pseudospin. Superradiant emission has been observed in numerous physical systems [2][3][4][5][6][7][8][9][10]. These collective effects are particularly prominent when the coupling between the spin ensemble and the radiation field (g ffiffiffiffi N p for N spins individually coupled with strength g) is larger than any of the losses in the system (κ þ γ, where κ is the radiative loss rate and γ is the spin dephasing rate).…”

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confidence: 99%

Coherent Rabi Dynamics of a Superradiant Spin Ensemble in a Microwave Cavity

et al. 2017

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We achieve the strong-coupling regime between an ensemble of phosphorus donor spins in a highly enriched 28 Si crystal and a 3D dielectric resonator. Spins are polarized beyond Boltzmann equilibrium using spin-selective optical excitation of the no-phonon bound exciton transition resulting in N ¼ 3.6 × 10 13 unpaired spins in the ensemble. We observe a normal mode splitting of the spin-ensemble-cavity polariton resonances of 2g ffiffiffiffi N p ¼ 580 kHz (where each spin is coupled with strength g) in a cavity with a quality factor of 75 000 ( γ ≪ κ ≈ 60 kHz, where γ and κ are the spin dephasing and cavity loss rates, respectively). The spin ensemble has a long dephasing time (T Ã 2 ¼ 9 μs) providing a wide window for viewing the dynamics of the coupled spin-ensemble-cavity system. The free-induction decay shows up to a dozen collapses and revivals revealing a coherent exchange of excitations between the superradiant state of the spin ensemble and the cavity at the rate g ffiffiffiffi N p. The ensemble is found to evolve as a single large pseudospin according to the Tavis-Cummings model due to minimal inhomogeneous broadening and uniform spin-cavity coupling. We demonstrate independent control of the total spin and the initial Z projection of the psuedospin using optical excitation and microwave manipulation, respectively. We vary the microwave excitation power to rotate the pseudospin on the Bloch sphere and observe a long delay in the onset of the superradiant emission as the pseudospin approaches full inversion. This delay is accompanied by an abrupt π-phase shift in the peusdospin microwave emission. The scaling of this delay with the initial angle and the sudden phase shift are explained by the Tavis-Cummings model.

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“…Shorter radiative lifetime directly leads to more intense emission during the transient process of the decay of the excited state. The superradiance has been an active field in atomic physics for decades [25][26][27]. Recently, it has also been studied in classical optics in the context of electromagnetically induced transparency [28,29], Fano interference [30][31][32] and in complex radiation environments [33][34][35][36].…”

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confidence: 99%