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

Kumano, H.; Kimura, Shuichi; Endo, Masayuki; Sasakura, H.; Adachi, S.; Muto, Shunichi; Suemune, I.

doi:10.1166/jno.2006.003

Cited by 41 publications

(37 citation statements)

References 90 publications

(146 reference statements)

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“…Therefore the L2 peak will be of biexcitonic nature while the L1 and L3 peaks will be of excitonic one. Time-resolved measurements were also performed on the L2 and L3 (also including L4) peaks with a streak camera and the recombination lifetimes of 0.55 ns and 1.02 ns were estimated, respectively [11]. This shorter lifetime for the L2 peak is consistent with the assignment of the biexcitonic nature.…”

Section: Resultssupporting

confidence: 73%

Highly circular-polarized single photon generation from a single quantum dot at zero magnetic field

Kobayashi

Kumano

Endo

et al. 2008

Microelectronics Journal

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Section: Resultssupporting

confidence: 73%

Highly circular-polarized single photon generation from a single quantum dot at zero magnetic field

Kobayashi

Kumano

Endo

et al. 2008

Microelectronics Journal

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“…Note that the horizontal energy axis is replotted from the midpoint of the two PL peaks of a neutral exciton. From the various measurements, 8,9,[13][14][15][16][17] the assignment of the spectral peaks could be achieved as follows: from the low energy side, a neutral biexciton (XX 0 ), a neutral exciton (X 0 ), and a positive trion (X þ ). In our QD sample, X þ PL was observed even at the minimum excitation power in the case of the wetting layer excitation.…”

Section: Methodsmentioning

confidence: 99%

Nuclear spin depolarization via slow spin diffusion in single InAlAs quantum dots observed by using erase-pump-probe technique

Adachi

Kaji

Furukawa

et al. 2012

Journal of Applied Physics

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Solid effect dynamic nuclear polarization and polarization pathways JCP: BioChem. Phys. 6, 01B602 (2012) Solid effect dynamic nuclear polarization and polarization pathways J. Chem. Phys. 136, 015101 (2012) On the accuracy of the state space restriction approximation for spin dynamics simulations J. Chem. Phys. 135, 084106 (2011) High-field Overhauser dynamic nuclear polarization in silicon below the metal-insulator transition J. Chem. Phys. 134, 154511 (2011) Additional information on J. Appl. Phys. Nuclear spin diffusion in single self-assembled InAlAs quantum dots was studied by using erase-pump-probe technique. As a measure of nuclear spin polarization, transients of the Overhauser shift (OHS) of positive trion were probed in the respective pulse region. The achieved stable OHS was relaxed with a long depolarization time as long as a few tens of seconds and a diffusion constant of $5 Â 10 À15 cm 2 /s was estimated. The slow transfer of the spin energy is considered to be due to the dipole-dipole interaction of the nuclei. In addition, through the magnetic field dependence of OHS, the stability of the nuclear spin polarization was briefly discussed, and the saturated maximum values of OHS were investigated experimentally. V C 2012 American Institute of Physics. [http://dx

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“…Furthermore, the lifetime T 1 is estimated to be ϳ1 ns from the single-QD-PL measurements using the streak camera. 13 Therefore, on this timescale, the difference of the coherence times between X + ͑or XX 0 ͒ and X 0 corresponds to the electron-hole exchange effect 1 / T 2 exchange , and T 2 exchange is estimated to be ϳ65 ps. For other QDs in the same and different mesas in the same sample, almost similar results are obtained and the value of T 2 exchange is in the range of 50-100 ps.…”

mentioning

confidence: 93%

Decoherence of exciton complexes in single InAlAs quantum dots measured by Fourier spectroscopy

Adachi

Yatsu

Kaji

et al. 2007

Applied Physics Letters

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We report the single-photon Fourier spectroscopy of exciton and exciton complexes in single self-assembled InAlAs/ AlGaAs quantum dots. A Michelson interferometer was inserted in the photoluminescence path for measuring the coherence length of the time-averaged emission of neutral excitons and their complexes. The effects of exchange interactions and fluctuations in the surrounding excess charges were estimated by comparing the coherence times and the excitation energies of the excitons and their complexes. © 2007 American Institute of Physics. ͓DOI: 10.1063/1.2800373͔Single quantum dot ͑QD͒ devices attract considerable attention in the field of semiconductor nanostructures because of their remarkable potential for single-photon emission, single-electron storage, and manipulation of single qubits for quantum information processing, which rely on discrete energy level of the QD due to its three-dimensional ͑3D͒ quantum confinement.1 However, a semiconductor QD can interact with its environment through carrier-phonon, carrier-carrier, and electron-nuclei interactions. In particular, electron-hole exchange interaction and electron-nuclei interactions are supposed to be enhanced due to the nanoscale 3D confinement. The suppression or positive utilization of the above interactions to realize an ideal isolated artificial atom is still a major challenge in the field of the semiconductor nanotechnology. The coherence time which is deduced from the coherence length or linewidth is an important parameter for the characterization of the single-photon wavepacket and emission and, therefore, to provide single-photon sources for quantum information processing. Currently, single-photon sources are an active research area, and the production of single photons on demand has been demonstrated using a variety of QDs with and without cavities in the visible to telecommunications wavelength range.2-8 Apart from such applications, the measurement of the coherence time provides fundamental physical information on excitons and exciton complexes with regard to the abovementioned interactions in QDs. In this paper, we report the effects of exchange interactions and fluctuation in the surrounding excess charges by comparing with the coherence times of exciton complexes in single self-assembled InAlAs QDs measured by the single-photon Fourier spectroscopy. The measurements of the coherence times of the positive trion and exciton complexes with an excited hole in a single QD have not been reported so far, and the presented data indicate clearly the effects of the exchange interactions on their coherence times.The samples contain layers of In 0.75 Al 0.25 As QDs embedded in an Al 0.3 Ga 0.7 As barrier layer grown on a ͑100͒ GaAs substrate by molecular beam epitaxy. The QDs are formed in the Stranski-Krastanow growth mode. For single-QD spectroscopy, small mesa structures with a typical top lateral size of ϳ150 nm are fabricated. A cw-Ti:sapphire laser beam traveling along the QD growth direction is focused on the sample surface by a microsco...

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

Cited by 41 publications

References 90 publications

Highly circular-polarized single photon generation from a single quantum dot at zero magnetic field

Highly circular-polarized single photon generation from a single quantum dot at zero magnetic field

Nuclear spin depolarization via slow spin diffusion in single InAlAs quantum dots observed by using erase-pump-probe technique

Decoherence of exciton complexes in single InAlAs quantum dots measured by Fourier spectroscopy

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