Optical orientation of donor-bound excitons in nanosized InP/InGaP islands

Dzhioev, R. I.; Zakharchenya, B. P.; Korenev, V. L.; Pak, P. E.; Vinokurov, D. A.; Kovalenkov, O. V.; Tarasov, I. S.

doi:10.1134/1.1130606

Cited by 38 publications

(50 citation statements)

References 10 publications

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“…27 Although the Hanle measurement is static, it has high sensitivity in measuring the spin-dephasing time of carriers in QDs. 23,24,28 We succeeded in measuring the Hanle effect of charge-tunable InP QDs with high sensitivity and accuracy of the circular polarization ͑0.1%͒. We observed optical orientation of the spin of the doped electrons under quasiresonant excitation and measured a spin-dephasing time T 2 * of 1.7 ns at 5 K, exceeding the recombination lifetime of 250 ps.…”

Section: Introductionmentioning

confidence: 99%

“…A long spin-dephasing time T 2 * , which is the lifetime of coherent superposition of spin-up and spin-down states, is absolutely imperative for the implementation of spin-based quantum computing and storage. Although a few studies have been made on spin-dephasing relaxation in charged QDs, [23][24][25][26] studies about the mechanisms of spin dephasing are still at the elementary stage.…”

Section: Introductionmentioning

confidence: 99%

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Spin dephasing of doped electrons in charge-tunable InP quantum dots: Hanle-effect measurements

et al. 2006

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The spin dephasing relaxation in single-electron-doped InP quantum dots was studied by means of Hanle measurements. When an InP quantum dot is doped with one electron on average, a narrow Lorentzian dip with half-width of 4.6 mT appeared and was superposed on two Lorentzians with half-widths of 1.54 and 128 mT in the Hanle curve. The half-widths 1.54 T, 128 mT, and 4.6 mT are ascribed to spin-dephasing relaxation of holes, electron-hole pairs, and doped electrons consistuting negative trions, respectively. The corresponding spin coherence time of the doped electrons at 5 K is 1.7 ns, which is determined by the frozen fluctuation of nuclear spins in the quantum dots. With increase of temperature, the spin-dephasing rate of the doped electrons increases.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spin dephasing of doped electrons in charge-tunable InP quantum dots: Hanle-effect measurements

et al. 2006

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“…Excitation of QD nanostructures by circularly polarized light provides the optical pumping of resident QD electrons [10,11,12]. A plausible scenario is the capture of single carriers into the dots.…”

Section: Measurement Techniquementioning

confidence: 99%

Stabilization of the Electron-Nuclear Spin Orientation in Quantum Dots by the Nuclear Quadrupole Interaction

Dzhioev

Korenev

2007

Phys. Rev. Lett.

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“…Recently, negative PL polarization of the trion with nonresonant circularly polarized excitation was explained with two alternative models [12,29,30]. The first [29,30] is based on the creation and accumulation of dark excitons due to single spin flips of delocalized holes.…”

Section: Prl 95 177403 (2005) P H Y S I C a L R E V I E W L E T T E mentioning

confidence: 99%

“…The first [29,30] is based on the creation and accumulation of dark excitons due to single spin flips of delocalized holes. Subsequent capture by a negatively charged QD and recombination leads to negative polarization.…”

Section: Prl 95 177403 (2005) P H Y S I C a L R E V I E W L E T T E mentioning

confidence: 99%

Polarized Fine Structure in the Photoluminescence Excitation Spectrum of a Negatively Charged Quantum Dot

et al. 2005

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We report polarized photoluminescence excitation spectroscopy of the negative trion in single charge tunable InAs/GaAs quantum dots. The spectrum exhibits a p-shell resonance with polarized fine structure arising from the direct excitation of the electron spin triplet states. The energy splitting arises from the axially symmetric electron-hole exchange interaction. The magnitude and sign of the polarization are understood from the spin character of the triplet states and a small amount of quantum dot asymmetry, which mixes the wavefunctions through asymmetric e-e and e-h exchange interactions.

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Optical orientation of donor-bound excitons in nanosized InP/InGaP islands

Cited by 38 publications

References 10 publications

Spin dephasing of doped electrons in charge-tunable InP quantum dots: Hanle-effect measurements

Spin dephasing of doped electrons in charge-tunable InP quantum dots: Hanle-effect measurements

Stabilization of the Electron-Nuclear Spin Orientation in Quantum Dots by the Nuclear Quadrupole Interaction

Polarized Fine Structure in the Photoluminescence Excitation Spectrum of a Negatively Charged Quantum Dot

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