Auger Recombination in Self-Assembled Quantum Dots: Quenching and Broadening of the Charged Exciton Transition

Kurzmann, Annika; Ludwig, Arne; Wieck, A. D.; Lorke, Axel; Geller, M.

doi:10.1021/acs.nanolett.6b01082

Cited by 72 publications

(64 citation statements)

References 39 publications

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“…1d for a schematic representation). This has been explained previously in Kurzmann et al 26 with the important conclusion that the intensity ratio between trion/exciton intensity in equilibrium measurements is given by the ratio between Auger/tunneling rate γ a /γ In . As the tunneling rate γ In in the sample used here is in the range of ms −1 , the Auger rate γ a exceeds the tunneling rate by more than two orders of magnitude (see below).…”

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confidence: 59%

Real-Time Detection of Single Auger Recombination Events in a Self-Assembled Quantum Dot

et al. 2020

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Auger recombination is a non-radiative process, where the recombination energy of an electron-hole pair is transferred to a third charge carrier. It is a common effect in colloidal quantum dots that quenches the radiative emission with an Auger recombination time below nanoseconds. In self-assembled QDs, the Auger recombination has been observed with a much longer recombination time in the order of microseconds.Here, we use two-color laser excitation on the exciton and trion transition in resonance fluorescence on a single self-assembled quantum dot to monitor in real-time every quantum event of the Auger process. Full counting statistics on the random telegraph signal give access to the cumulants and demonstrate the tunability of the Fano factor from a 1 arXiv:1911.04789v2 [cond-mat.mes-hall] 13 Nov 2019Poissonian to a sub-Poissonian distribution by Auger-mediated electron emission from the dot. Therefore, the Auger process can be used to tune optically the charge carrier occupation of the dot by the incident laser intensity; independently from the electron tunneling from the reservoir by the gate voltage. Our findings are not only highly relevant for the understanding of the Auger process, it also demonstrates the perspective of the Auger effect for controlling precisely the charge state in a quantum system by optical means.The excitonic transitions in self-assembled quantum dots (QDs) 1,2 realize perfectly a twolevel system in a solid-state environment. These transitions can be used to generate single photon sources 3,4 with high photon indistinguishability, 5,6 an important prerequisite to use quantum dots as building blocks in (optical) quantum information and communication technologies. 7,8 Moreover, self-assembled QDs are still one of the best model systems to study in an artificial atom the carrier dynamics, 9,10 the spin-and angular-momentum properties 11,12 and charge carrier interactions. 13 One important effect of carrier interactions is the Auger process: An electron-hole pair recombines and instead of emitting a photon, the recombination energy is transferred to a third charge carrier, which is then energetically ejected from the QD. 14-17 This is a common effect, mostly studied in colloidal QDs, where it quenches the radiative emission with recombination times in the order of picoseconds to nanoseconds. [18][19][20] This limits the efficiency of optical devices containing QDs like LEDs 21,22 or single photon sources. [23][24][25] In self-assembled QDs, Auger recombination was speculated to be absent, and only recently, it was directly observed in optical measurements on a single self-assembled QD coupled to a charge reservoir with recombination times in the order of microseconds. 26As a single Auger process is a quantum event, it is unpredictable and only the statistical evaluation of many processes gives access to the physical information of the recombination

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confidence: 59%

Real-Time Detection of Single Auger Recombination Events in a Self-Assembled Quantum Dot

et al. 2020

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“…We note that the tunneling rate is large enough that no quenching of the resonance fluorescence of X 1− due to an Auger process (by which an electron-hole pair in the X 1-decays by ejecting the second electron out of the quantum dot) is expected. The Auger process was demonstrated for thicker tunnel barriers [31].…”

Section: Plotted Inmentioning

confidence: 99%

Narrow optical linewidths and spin pumping on charge-tunable close-to-surface self-assembled quantum dots in an ultrathin diode

et al. 2017

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We demonstrate full charge control, narrow optical linewidths, and optical spin pumping on single selfassembled InGaAs quantum dots embedded in a 162.5-nm-thin diode structure. The quantum dots are just 88 nm from the top GaAs surface. We design and realize a p-i-n-i-n diode that allows single-electron charging of the quantum dots at close-to-zero applied bias. In operation, the current flow through the device is extremely small resulting in low noise. In resonance fluorescence, we measure optical linewidths below 2 μeV, just a factor of 2 above the transform limit. Clear optical spin pumping is observed in a magnetic field of 0.5 T in the Faraday geometry. We present this design as ideal for securing the advantages of self-assembled quantum dots-highly coherent single-photon generation, ultrafast optical spin manipulation-in the thin diodes required in quantum nanophotonics and nanophononics applications.

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“…Auger recombination of charge‐carriers is a many‐body nonradiative process comprises a recombination of an electron with a hole, accompanied by recombination energy and momentum is transferred to an additional carrier either electron or hole, recognized as Auger electron or hole and is most significant at high carrier concentrations. In many colloidal QDs, the Auger recombination time takes place in the picosecond range and efficiently quenches the light emission …”

Section: Nanoparticles For Photovoltaics: Beyond the Shockley–queissementioning

confidence: 91%

“…In many colloidal QDs, the Auger recombination time takes place in the picosecond range and efficiently quenches the light emission. [124] Usually, PLQY is controlled by k 1 and charge carrier density (n) at the typical working conditions of the PeLED. It is limited at low charge carrier density because of the charge trapping at defects sites, while at high carrier density, the traps states are mostly filled and recombination of the photogenerated species is dominated by radiative processes.…”

Section: Nanoparticles For Photovoltaics: Beyond the Shockley-queissementioning

confidence: 99%

Perovskite Nanoparticles: Synthesis, Properties, and Novel Applications in Photovoltaics and LEDs

et al. 2018

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Solar cells and light‐emitting diodes (LEDs) based on metal‐halide perovskites are transitioning from promising performers to direct competitors to well‐established technologies, with cost‐effectiveness as a strong advantage. Nanostructured perovskites have yielded record LEDs due to their higher versatility in the local management of charge carriers, which has enabled photoluminescence quantum yields (PLQYs) close to 100%. However, these perovskite nanostructures are yet to be fully exploited in other applications such as photovoltaics, where they can also present competitive advantages as they enable feasible routes to surpass the Shockley–Queisser limit by means of multiexciton generation or hot‐carrier extraction. Besides conventional applications, the extraordinary properties of these materials have the potential to unlock novel areas of research. Herein, the potential of perovskite nanostructures—with the focus on the widely developed nanoparticles—beyond classical thin‐film optoelectronics is analyzed, their limits of application are discussed, and their real possibilities are pondered.

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Auger Recombination in Self-Assembled Quantum Dots: Quenching and Broadening of the Charged Exciton Transition

Cited by 72 publications

References 39 publications

Real-Time Detection of Single Auger Recombination Events in a Self-Assembled Quantum Dot

Real-Time Detection of Single Auger Recombination Events in a Self-Assembled Quantum Dot

Narrow optical linewidths and spin pumping on charge-tunable close-to-surface self-assembled quantum dots in an ultrathin diode

Perovskite Nanoparticles: Synthesis, Properties, and Novel Applications in Photovoltaics and LEDs

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