Localization of excitons in disordered quantum wires probed by single-photon correlation spectroscopy

Malko, Anton V.; Baier, M.; Pelucchi, E.; Oberli, D. Y.; Leifer, Klaus; Chek-al-kar, D.; Kapon, E.

doi:10.1063/1.1830689

Cited by 9 publications

(9 citation statements)

References 13 publications

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“…The adjacent periodic correlation peaks represent an X 0 photon emission by one laser pulse and subsequent X À photon emission by the next pulse after a 12.2-ns interval. The observed antibunching directly exhibits that the two emission lines X 0 and X À originate from the same single QD, 85,86 and that neutral and charged excitons are formed exclusively with each other in the same QD.…”

Section: Competing Transition Processes In a Single Quantum Dotmentioning

confidence: 98%

Deterministic Single-Photon and Polarization-Correlated Photon Pair Generations From a Single InAlAs Quantum Dot

Kumano¹,

Kimura²,

Endo³

et al. 2006

Journal of Nanoelectronics and Optoelectronics

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Photon emission with nonclassical photon statistics is discussed with a single InAlAs quantum dot. The deterministic single-photon generation in which the emitted photon wavelength matches well to the highly sensitive wavelength region of highly efficient, low-noise Si-single-photon detectors and also to an atmospheric transmission window is demonstrated. Competing transition processes between neutral and charged exciton species originating from an exclusive formation in the same single quantum dot are clarified. It was found that suppressing the charged exciton formation is possible by a quasi-resonant excitation for a deterministic monochromatic single-photon generation. Polarizationdependent photoluminescence spectroscopy clearly indicates the preservation of photon polarizations between photons emitted by biexciton/exciton recombinations. Furthermore, the deterministic polarization-correlated photon pair generation with biexciton-exciton cascaded transition occurring in a single quantum dot is directly confirmed by the polarized second-order photon correlation measurements. This indicates a longer polarization flip time than the exciton lifetime, which is an essential requirement for the deterministic Einstein-Podolsky-Rosen photon pair generation under the present biexciton-exciton cascaded transition scheme.

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Section: Competing Transition Processes In a Single Quantum Dotmentioning

confidence: 98%

Deterministic Single-Photon and Polarization-Correlated Photon Pair Generations From a Single InAlAs Quantum Dot

Kumano¹,

Kimura²,

Endo³

et al. 2006

Journal of Nanoelectronics and Optoelectronics

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“…7 The optical emission properties of the pyramidal QDs were investigated by a Hanbury-Brown and Twiss ͑HBT͒ setup for the photon correlation measurements combined with a microphotoluminescence ͑PL͒ setup for the PL studies as described in Ref. 8. The sample was mounted in a He-flow cryostat and kept at a temperature of 10 K. The sample was excited either by the beam of a continuous-wave laser operating at 532 nm or of a pulsed Ti:sapphire laser emitting at 740 nm; it was focused to ϳ1 m spot by a microscope objective ͑NA= 0.55͒.…”

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confidence: 99%

Single-photon emission from pyramidal quantum dots: The impact of hole thermalization on photon emission statistics

et al. 2005

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We report an experimental study of the emission statistics of excitonic complexes from a single quantum dot and their temperature dependence. The single photon emission from the exciton ground state is shown to persist up to 80 K. The deterioration of single photon statistics is attributed to new biexciton emissions, which emerge in the vicinity of the main single-exciton peak at rising temperatures. We identify these biexcitonic states as being formed by either one hole or two holes occupying excited states and analyze their specific polarization and power-dependent signature.The rapidly evolving field of quantum information technology relies on nonclassical emission sources capable of emitting single photons at predetermined times and with well-established spectral and temporal characteristics. These sources are required for the implementation of quantum computation 1,2 and quantum communication protocols. 3 An atom considered as a two-level quantum system emits spontaneously antibunched photons when it is excited because the emission of one photon resets the system in its ground state and a subsequent emission cannot occur immediately afterwards. A single semiconductor quantum dot ͑QD͒ is often described as the solid-state analog of an atom since threedimensional confinement results in a discrete energy spectrum. Unlike an atom, however, a QD is incorporated in a solid-state environment that introduces carrier-lattice interaction. Hence, the atomic-like picture of the unperturbed ground state, which can serve as a quantum emitter 4 at low enough temperature ͑around 10 K͒, partially breaks down at elevated temperatures when excited states are being occupied and when electron-phonon interaction broadens the optical transitions. The interaction with the solid-state environment is thus expected to also have an impact on the statistics of photons emitted by QD excitons, particularly at elevated temperatures. An understanding of this impact is particularly important for the realization of practical solid-state single photon emitters operating at sufficiently high ͑e.g., T Ͼ 77 K͒ temperatures.The temperature dependence of the features of single photon emission from semiconductor QDs has been left so far largely unexplored; there are only few studies of high temperature ͑Ͼ40 K͒ photon emission statistics from epitaxially grown QDs. 5 In this paper we report on an experimental study of the temperature dependence of the photon antibunching from single pyramidal InGaAs/ AlGaAs QDs. Extending our previous work, 6 we demonstrate single photon statistics of the exciton ͑X͒ emission from 10 K up to 80 K. This is the highest temperature for which photon antibunching is reported for such a material system. By using single photon correlation measurements combined with a quantitative analysis of the emission spectra, we find that emission from other transitions related to the QD ground state, such as biexciton ͑2X͒ and positively charged exciton ͑X + ͒ cannot cause a disappearance of photon antibunching. Instead, we identify th...

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“…7 Temporal single photon correlation measurements can also be used to gain knowledge about the spatial origin of the emission lines. 8 In this work, we investigate the possibility to use the polarization properties of the excitonic emission from GaN QDs in order to relate the measured emission lines to specific dots. It is found experimentally that both the exciton and the biexciton originating from the same asymmetric QD not only exhibit identical polarization directions, as expected, but also similar degrees of linear polarization.…”

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confidence: 99%

On the polarized emission from exciton complexes in GaN quantum dots

Amloy

Karlsson

Andersson

et al. 2012

Applied Physics Letters

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The optical linear polarization properties of exciton complexes in asymmetric Stranski-Krastanov grown GaN quantum dots have been investigated experimentally and theoretically. It is demonstrated that the polarization angle and the polarization degree can be conveniently employed to associate emission lines in the recorded photoluminescence spectra to a specific dot. The experimental results are in agreement with configuration interaction computations, which predict similar polarization degrees for the exciton and the biexciton (within 10%) in typical GaN quantum dots. The theory further predicts that the polarization degree can provide information about the charge state of the dot.

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Localization of excitons in disordered quantum wires probed by single-photon correlation spectroscopy

Cited by 9 publications

References 13 publications

Deterministic Single-Photon and Polarization-Correlated Photon Pair Generations From a Single InAlAs Quantum Dot

Deterministic Single-Photon and Polarization-Correlated Photon Pair Generations From a Single InAlAs Quantum Dot

Single-photon emission from pyramidal quantum dots: The impact of hole thermalization on photon emission statistics

On the polarized emission from exciton complexes in GaN quantum dots

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