Spin fluctuations of nonequilibrium electrons and excitons in semiconductors

Glazov, M. M.

doi:10.1134/s1063776116030067

Cited by 28 publications

(29 citation statements)

References 61 publications

(112 reference statements)

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“…Absorption of a σ + or σ − cavity photon by the QD results in a transition from the hole | ± 3/2 spin state to the trion | ± 1/2 state, respectively, as shown by the red arrows. The generation rate is given by [37]…”

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confidence: 99%

Spin and reoccupation noise in a single quantum dot beyond the fluctuation-dissipation theorem

et al. 2018

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We report on the nonequilibrium spin noise of a single InGaAs quantum dot charged by a single hole under strong driving by a linearly polarized probe light field. The spectral dependency of the spin noise power evidences a homogeneous broadening and negligible charge fluctuations in the environment of the unbiased quantum dot. Full analysis of the spin noise spectra beyond the fluctuation-dissipation theorem yields the heavy-hole spin dynamics as well as the trion spin dynamics. Moreover, the experiment reveals an additional much weaker noise contribution in the Kerr rotation noise spectra. This additional noise contribution has a maximum at the quantum dot resonance and shows a significantly longer correlation time. Magnetic-field-dependent measurements in combination with theoretical modeling prove that this additional noise contribution unveils a charge reoccupation noise which is intrinsic in naturally charged quantum dots. arXiv:1708.01245v2 [cond-mat.mes-hall]

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confidence: 99%

Spin and reoccupation noise in a single quantum dot beyond the fluctuation-dissipation theorem

et al. 2018

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“…The positively charged QD in the presence of probe light can be described by a four-level system. 20,21 The ground states are |±3/2 with the corresponding pro- jection of the heavy-hole spin on the growth axis. Absorption of a photon by the QD leads to the formation of singlet trion states |±1/2 , which are characterized by the spin of the electron in the trion.…”

Section: Modelmentioning

confidence: 99%

Hole-capture competition between a single quantum dot and an ionized acceptor

et al. 2018

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We study the competition of hole capture between an In(Ga)As quantum dot and a directly adjacent ionized impurity in view of spin-photon interfaces. The Kerr rotation noise spectroscopy at 4.2 K shows that the hole-capture probability of the In(Ga)As quantum dot is about one order of magnitude higher compared to the hole-capture probability of the ionized impurity and suggests that a simultaneous occupation of quantum dot and impurity by a hole is efficiently suppressed due to Coulomb interaction. A theoretical model of interconnected spin and charge noise allows the quantitative specification of all relevant time scales. arXiv:1808.05574v1 [cond-mat.mes-hall]

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“…Additional informative abilities of the SNS arise under conditions of strong or resonant optical "probing", when the effects of nonlinear optics become essential, and the SNS is getting fundamentally perturbative [13]. In these cases, the SNS provides novel information about mechanisms of spin-photon interaction as well as about the nonequilibrium dynamics of charge carriers and spins [14,15].…”

Section: Introductionmentioning

confidence: 99%

Homogenization of Doppler broadening in spin-noise spectroscopy

et al. 2018

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The spin noise spectroscopy, being a nonperturbative linear optics tool, is still reputed to reveal a number of capabilities specific to nonlinear optics techniques. The new effect of the Doppler broadening homogenization discovered in this work essentially widens these unique properties of spin noise spectroscopy. We investigate spin noise of a classical system-cesium atoms vapor with admixture of buffer gas-by measuring the spininduced Faraday rotation fluctuations in the region of D2 line. The line, under our experimental conditions, is strongly inhomogeneously broadened due to the Doppler effect. Despite that, optical spectrum of the spin noise power has the shape typical for the homogeneously broadened line with a dip at the line center. This fact is in stark contrast with the results of previous studies of inhomogeneous quantum dot ensembles and Doppler broadened atomic systems. In addition, the two-color spin-noise measurements have shown, in a highly spectacular way, that fluctuations of the Faraday rotation within the line are either correlated or anticorrelated depending on whether the two wavelengths lie on the same side, or on different sides of the resonance. The experimental data are interpreted in the frame of the developed theoretical model which takes into account both kinetics and spin dynamics of Cs atoms. It is shown that the unexpected behavior of the Faraday rotation noise spectra and effective homogenization of the optical transition in the spin-noise measurements are related to smallness of the momentum relaxation time of the atoms as compared with their spin relaxation time. Our findings demonstrate novel abilities of spin noise spectroscopy for studying dynamic properties of inhomogeneously broadened ensembles of randomly moving spins.

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Spin fluctuations of nonequilibrium electrons and excitons in semiconductors

Cited by 28 publications

References 61 publications

Spin and reoccupation noise in a single quantum dot beyond the fluctuation-dissipation theorem

Spin and reoccupation noise in a single quantum dot beyond the fluctuation-dissipation theorem

Hole-capture competition between a single quantum dot and an ionized acceptor

Homogenization of Doppler broadening in spin-noise spectroscopy

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