Optical spectroscopy on individual CdSe/ZnMnSe quantum dots

Bacher, G.; Schömig, H.; Welsch, M. K.; Zaı̆tsev, S. V.; Kulakovskiĭ, V. D.; Forchel, A.; Lee, S.; Dobrowolska, M.; Furdyna, J. K.; König, Barbara; Ossau, W.

doi:10.1063/1.1387256

Cited by 60 publications

(41 citation statements)

References 25 publications

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“…This is similar to the results by Titova et al [25] where pronounced PL peaks at approximately 2.1 eV were observed for samples grown by a MBE growth procedure where 0.2 to 0.5 monolayers of MnSe were deposited on ZnSe buffer layers prior to the deposition of the CdSe layer from which nominally pure CdSe QDs formed after the deposition of a ZnSe capping layer [6,7]. None of the above mentioned studies [23][24][25] confirmed their PL peak assignments with structural analyses on the same samples. Since we indeed observed (110) superlattice spots in SAED patterns of [001] plan views prepared from the samples presented in ref.…”

Section: A Ii-vi Quantum Dotssupporting

confidence: 77%

“…For the lack of contradicting structural analysis results, we speculate that our tentative assignment of the peaks at approximately 2 eV and 2.1 eV to atomically ordered agglomerates and atomically ordered QDs might also be applicable to the related peaks around 2.1 eV that Kim et al [2 3] and Bacher at al. [24] observed.…”

Section: A Ii-vi Quantum Dotsmentioning

confidence: 94%

“…Single QD studies of nominally pure CdSe QDs in Mn 0.25 Zn 0.75 Se matrix by Bacher et al showed intense PL peaks at approximately 2.09 eV, i.e. below the transition between internal Mn 2+ states at 2.15 eV [24]. This is similar to the results by Titova et al [25] where pronounced PL peaks at approximately 2.1 eV were observed for samples grown by a MBE growth procedure where 0.2 to 0.5 monolayers of MnSe were deposited on ZnSe buffer layers prior to the deposition of the CdSe layer from which nominally pure CdSe QDs formed after the deposition of a ZnSe capping layer [6,7].…”

Section: A Ii-vi Quantum Dotsmentioning

confidence: 99%

“…Atomic ordering (and possibly phase separation) in W13. 5.4 epitaxial (Cd,Mn,Zn)(S,Se) with small or zero Mn content that manifests itself by luminescence peaks between 2 and 2.1 eV [2,[23][24][25][26], may, after all, not be a rarely occurring phenomenon. Fig.…”

Section: A Ii-vi Quantum Dotsmentioning

confidence: 99%

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Atomic Ordering in Self-assembled Epitaxial II-VI and IV-VI Compound Semiconductor Quantum Dot Systems

et al. 2002

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Transmission electron microcopy (TEM) in both the parallel illumination and scanning probe mode revealed atomically ordered entities within a 5 to 250 nm range in a IV-VI and a II-VI compound semiconductor quantum dot (QD) system. While the II-VI system was a nominal [001] CdSe/(Mn 0.1 Zn 0.9 )Se multilayer structure with the QDs embedded, the IV-VI system nominally consisted of [111] PbSe islands. The comparison of photoluminescence (PL) spectra from the CdSe/(Mn 0.1 Zn 0.9 )Se structure with those of a reference structure, that was grown to the same nominal specification under otherwise identical conditions except that no Mn was incorporated into the cladding layers, revealed for the former sample two peaks at approximately 2 and 2.1 eV. We tentatively attribute these two PL peaks to two groups of atomically ordered entities.

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Section: A Ii-vi Quantum Dotssupporting

confidence: 77%

Section: A Ii-vi Quantum Dotsmentioning

confidence: 94%

Section: A Ii-vi Quantum Dotsmentioning

confidence: 99%

Section: A Ii-vi Quantum Dotsmentioning

confidence: 99%

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Atomic Ordering in Self-assembled Epitaxial II-VI and IV-VI Compound Semiconductor Quantum Dot Systems

et al. 2002

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“…In order to achieve a good control of the magnetic properties, it is of great importance to control the number and position of magnetic ions inside of the dots. There were several papers reporting properties of QDs with large number of Mn ions, typically of the order of 100, confined in the QDs [2][3][4], and more recently with only one single Mn ion [1]. In this paper we present a method to introduce only a small number of Mn ions, in the order of 10, directly into the QDs and we believe to place most of them in the centre of our QDs.…”

Section: Introductionmentioning

confidence: 93%

Determination of the number of Mn ions inside CdMnTe self assembled quantum dots

Wojnar¹,

Suffczyński

Kowalik

et al. 2006

Phys. Status Solidi (c)

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We have grown self assembled CdMnTe/CdZnTe quantum dots with small amount of Mn ions by molecular beam epitaxy. Using atomic layer epitaxy growth mode for the deposition of the QDs layer, we were able to add the manganese ions only into the two central monolayers of six monolayers-thick CdTe layers, thus, achieving great dilution of Mn ions. Micro-photoluminescence measurements performed in an external magnetic field confirmed that the Mn ions are successfully incorporated in the CdTe QDs, which manifests itself by the strong circular polarization and the giant Zeeman splitting of PL-lines coming from individual QDs. Studying the magnetic field dependencies of several QDs from our ensemble, we found that the energy shifts acquire, approximately, only few nearly discrete values. We attribute this effect to small number of Mn ions inside our QDs that contribute to the splitting of excitons and we use the saturation values of the shift it to determine this number precisely.

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Optical Spectroscopy on Non-Magnetic and Semimagnetic Single Quantum Dots in External Fields

Bacher

Schömig

Seufert

et al. 2002

phys. stat. sol. (b)

Self Cite

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We demonstrate the ability to control the eigenstates in single quantum dots by applying welldefined external fields. Electric fields oriented in-plane as well as perpendicular to the disc-shaped dots allow a modification of the spatial part of the excitonic wavefunction, giving access to the charge distribution in the dot. In contrast, magnetic fields modify the spin part of the wavefunction, resulting in a Zeeman splitting and a diamagnetic shift of the photoluminescence emission. We used the unique property of semimagnetic quantum dots to tailor the effective g-factor, i.e. the sensitivity of the eigenstates to external magnetic fields, by about two orders of magnitude simply by varying the Mn concentration in the dots.Introduction Semiconductor single quantum dots (SQDs) are often designated as 'artificial atoms', because their discrete energy level structure very much resembles that of 'real' atoms. In contrast to atoms, however, the eigenstates in SQDs can be modified by varying the extension or the composition of the quantum dots. For that reason, semiconductor SQDs represent a new class of materials with size dependent electronic, optical or even magnetic properties. This has caused a huge interest in such systems both from a basic physics point of view as well as due to fascinating device concepts like single electron devices, single photon sources or quantum computing. In this context, two topics are of strong interest: (i) the ability to control the occupation of SQDs with a discrete number of electrons and/or holes and (ii) the feasibility to manipulate the SQD eigenstates in a well-defined manner by using external electric or magnetic fields.The most convenient technique to vary the SQD occupation with electron-hole pairs is optical excitation. Simply by changing the excitation power, SQDs can be occupied by either one, two or even more electron-hole pairs and indeed, lots of recent publications have been devoted to optical studies on single excitons, biexcitons or multiexcitons in both, III-V [1-5] and II-VI [6-11] SQDs. In order to achieve a SQD occupation with an unequal number of electrons and holes, one may use above-barrier optical

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Optical spectroscopy on individual CdSe/ZnMnSe quantum dots

Cited by 60 publications

References 25 publications

Atomic Ordering in Self-assembled Epitaxial II-VI and IV-VI Compound Semiconductor Quantum Dot Systems

Atomic Ordering in Self-assembled Epitaxial II-VI and IV-VI Compound Semiconductor Quantum Dot Systems

Determination of the number of Mn ions inside CdMnTe self assembled quantum dots

Optical Spectroscopy on Non-Magnetic and Semimagnetic Single Quantum Dots in External Fields

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