Single-exciton energy shell structure in InAs/GaAs quantum dots

Awirothananon, S.; Raymond, S.; Studenikin, Sergei; Vachon, Martin; Render, W.; Sachrajda, A. S.; Wu, Xiaozhi; Babiński, A.; Potemski, M.; Fafard, S.; Cheng, Shun‐Jen; Korkusiński, Marek; Hawrylak, Paweł

doi:10.1103/physrevb.78.235313

Cited by 11 publications

(5 citation statements)

References 40 publications

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“…The photoluminescence excitation (PLE) spectrum of excitons in InAs/GaAs QDs was also investigated in high magnetic fields [21]. Application of magnetic field perpendicular to the plane of the QDs allowed to reveal the angular-momentum structure of the energy shells.…”

Section: Single Excitons In High Magnetic Fieldsmentioning

confidence: 99%

Optical spectroscopy on semiconductor quantum dots in high magnetic fields

Babiński

Potemski

Christianen

2013

Comptes Rendus. Physique

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We review the recent literature on the use of optical spectroscopy of semiconductor quantum dots in high magnetic fields. We address both self-assembled epitaxial dots and colloidal nanocrystal quantum dots, each of which has its own characteristic optical response. Combining simple theoretical models for quantum confinement with the effect of high magnetic fields we describe the basic optically allowed transitions expected for epitaxial and colloidal quantum dots. Within these models we discuss the effects of quantum confinement and orbital and spin Zeeman effects on the optical spectra, illustrated by experimental examples. Finally, effects of electron-electron and exchange interactions are addressed.

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Section: Single Excitons In High Magnetic Fieldsmentioning

confidence: 99%

Optical spectroscopy on semiconductor quantum dots in high magnetic fields

Babiński

Potemski

Christianen

2013

Comptes Rendus. Physique

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“…Changes in ASEE-spectra of the nt-C/KCl layer under laser pumping qualitatively reproduced the form of low spatial resolution InGaAs QD's exciton spectrum due to shells filling obtained in [11,12]. Such mode of registration is inherent in the study.…”

Section: Asee Spectra Dependence Upon Excitationmentioning

confidence: 63%

“…Sufficient progress was achieved in growth of such nano systems and their investigations by means of optics and magnetooptics of excitons under resonance laser excitation [8,10]. A shell structure, filling of s,p,d,f-excitonic levels, an ultra narrow width and high oscillator strength of the exciton line transition, a fine structure due to exchange interactions of electrons and holes and long times of spin relaxation were discovered for single and self-organized InGaAs QDs [11][12][13][14][15][16]. Advances in optics and magnetooptics of excitons have been achieved in InGaAs QRs as well [8,17].…”

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confidence: 98%

Exciton emission in tetrahedral carbon self‐organized and ring‐shaped quantum dots

Mashchenko

Puzikov

Семенов

et al. 2010

Phys. Status Solidi (c)

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AFM topography, TEM data, spectra of radiative annihilation of excitons in tetrahedral nano carbon quantum dots (QDs) and quantum rings (QRs) were studied in detail. Anti‐Stokes exciton emission (ASEE) spectra in 6.3–4.7 eV energy interval at 4.2–200 K were induced via cascade Urbach tail states transitions under femtosecond laser radiation (λ=266 nm) pumping. Near diamond in composition nano carbon layers (nt‐C) on cleaved KCl and polished Si substrates with high density of self‐organized surface QDs, isolated, aggregated QRs and fractal bulk networks were grown using carbon ion beam of low energy and fluence. Regular networks of QDs 3–20 nm in diameter less than 1 nm in height and up to 3×1011 cm‐2density were obtained. In ASEE spectra fine–structured via 5–6 meV narrow and week 6.0596 eV, 6.0557 eV and 6.0032 eV lines have been resolved at low level of excitation. The strong, fine‐structured via 3.0–4.5 meV lines and bands above and below the energy of indirect exciton transition in diamond have been found in two types of nt‐C layers as well. The parameter dependences of lines and bands upon the level of laser pumping were studied. We suppose that above mentioned components of ASEE spectra are originated from radiative annihilation of excitons in surface and bulk QDs and ring‐like quantum networks. At strong excitation level fine‐structured with 3.5–4.0 meV energy period new 4.8394 eV and 4.7925 eV exciton lines were induced and dominated in emission spectra. These lines are result of exciton annihilation in bulk quantum confined fractal features. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…The model considered carrier redistribution among six QD states, though the EC signal was calculated for the first two (three) states for the low-(high-) excitation fluence. The level degeneracies 30 were taken as g i = 2i, with i = 1,2,3, . .…”

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confidence: 99%

Pauli blocking dynamics in optically excited quantum dots: A picosecond excitation-correlation spectroscopic study

et al. 2013

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State-filling dynamics in self-assembled InAs/GaAs quantum dots (QDs) is studied through their steady-state photoluminescence (PL) using a variant of picosecond excitation-correlation (EC) spectroscopy. Steady-state PL showed an interesting transition from bimolecular recombination at low-excitation fluence to excitonic recombination at higher fluence. As for the EC signal, while the ground-state response is always snubbed when the two excitation pulses are temporally nearly coincident, the excited-state response can either be enhanced or reduced, depending on the excitation fluence. The time evolution of this response is studied for the first three levels in a QD ensemble. A minimal theoretical model, which combines carrier loss kinetics with the principle of detailed balance and the Pauli exclusion principle, quantitatively reproduces the observations.

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Single-exciton energy shell structure in InAs/GaAs quantum dots

Cited by 11 publications

References 40 publications

Optical spectroscopy on semiconductor quantum dots in high magnetic fields

Optical spectroscopy on semiconductor quantum dots in high magnetic fields

Exciton emission in tetrahedral carbon self‐organized and ring‐shaped quantum dots

Pauli blocking dynamics in optically excited quantum dots: A picosecond excitation-correlation spectroscopic study

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