Self-assembly of vertically aligned quantum ring-dot structure by Multiple Droplet Epitaxy

Elborg, Martin; Noda, Takeshi; Mano, Takaaki; Kuroda, Takashi; Ya, Yao; Sakuma, Yoshiki; Sakoda, Kazuaki

doi:10.1016/j.jcrysgro.2017.03.023

Cited by 25 publications

(30 citation statements)

References 20 publications

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“…The semiconductor quantum dot-quantum ring (QDR) complex, in which charge carriers undergo the combined influence of -coupled- QD- and QR-type quantum confinement, has also been a subject of study 45 – 58 . Among these examples, there are several works devoted to fabricating QDR systems 46 , 47 , 50 , 54 , 56 , 58 . It is worth to highlight as well the very recent investigation by Heyn et al in which a new kind of nanostructure related with the phenomenon of field-induced quantum dot to ring transformation in GaAs cone-shell quantum structures has been put forward 58 .…”

Section: Introductionmentioning

confidence: 99%

“…The interest of the present work is directly motivated by the research on self-assembled, vertically aligned, quantum ring-dot structures performed by Elborg and collaborators 54 . there, by making use of multiple droplet epitaxy (DE) technique, the QDRs were obtained by depositing GaAs QRs in a first droplet epitaxy process.…”

Section: Introductionmentioning

confidence: 99%

“…According to the authors, the designed growth technology would allow for selectively tuning the geometry of the dot-ring complex, which makes it attractive to possible quantum information applications.

Figure 1 Schematic representation of a GaAs quantum dot-quantum ring system (blue color) embedded in a matrix of Al Ga As (gray color) and air 54 . The lateral building of the system ( a ) and a cut view of the system, after rotation of plot ( a ) around z -axis ( b ).…”

Section: Introductionmentioning

confidence: 99%

“… Schematic representation of a GaAs quantum dot-quantum ring system (blue color) embedded in a matrix of Al Ga As (gray color) and air 54 . The lateral building of the system ( a ) and a cut view of the system, after rotation of plot ( a ) around z -axis ( b ).…”

Section: Introductionmentioning

confidence: 99%

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Electronic structure of vertically coupled quantum dot-ring heterostructures under applied electromagnetic probes. A finite-element approach

Vinasco

Laroze

Radu

et al. 2021

Sci Rep

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We theoretically investigate the electron and hole states in a semiconductor quantum dot-quantum ring coupled structure, inspired by the recent experimental report by Elborg and collaborators (2017). The finite element method constitutes the numerical technique used to solve the three-dimensional effective mass equation within the parabolic band approximation, including the effects of externally applied electric and magnetic fields. Initially, the features of conduction electron states in the proposed system appear discussed in detail, under different geometrical configurations and values of the intensity of the aforementioned electromagnetic probes. In the second part, the properties of an electron-hole pair confined within the very kind of structure reported in the reference above are investigated via a model that tries to reproduce as close as possible the developed profile. In accordance, we report on the energies of confined electron and hole, affected by the influence of an external electric field, revealing the possibility of field-induced separate spatial localization, which may result in an indirect exciton configuration. In relation with this fact, we present a preliminary analysis of such phenomenon via the calculation of the Coulomb integral.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electronic structure of vertically coupled quantum dot-ring heterostructures under applied electromagnetic probes. A finite-element approach

Vinasco

Laroze

Radu

et al. 2021

Sci Rep

View full text Add to dashboard Cite

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“…Exciton–exciton interactions were analyzed in detail in quantum wells [44,45,46,47], double quantum wells [48], transition-metal dichalcogenide monolayers [49,50] and quantum wires [51]. In the domain of physics of quantum rings, the impact of Coulomb interactions on Aharonov–Bohm effect was studied for few electron configurations both theoretically [24] and experimentally [52,53]. In addition, the combined effect of electron–hole interaction and the radial confinement of particles on the exciton energy spectra was studied [54,55].…”

Section: Introductionmentioning

confidence: 99%

Exciton–Exciton Interactions in Coaxial Double Quantum Rings

et al. 2019

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We study theoretically the quantum states of two interacting excitons in coaxial double quantum rings. An interplay between exciton–exciton Coulomb interactions and specific geometry of the structure leads to the emergence of peculiar energy spectrum of two exciton system. We develop a semi-analytic approach providing highly accurate energies of system in the wide range of values of geometrical parameters relevant to experimental realizations.

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Physics of Quantum Rings

2018

NanoScience and Technology

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This chapter is devoted to optical properties of so-called Aharonov-Bohm quantum rings (quantum rings pierced by a magnetic flux resulting in Aharonov-Bohm oscillations of their electronic spectra) in external electromagnetic fields. It studies two problems. The first problem deals with a single-electron Aharonov-Bohm quantum ring pierced by a magnetic flux and subjected to an in-plane (lateral) electric field. We predict magneto-oscillations of the ring electric dipole moment. These oscillations are accompanied by periodic changes in the selection rules for inter-level optical transitions in the ring allowing control of polarization properties of the associated terahertz radiation. The second problem treats a single-mode microcavity with an embedded Aharonov-Bohm quantum ring which is pierced by a magnetic flux and subjected to a lateral electric field. We show that external electric and magnetic fields provide additional means of control of the emission spectrum of the system. In particular, when the magnetic flux through the quantum ring is equal to a half-integer number of the magnetic flux quanta, a small change in the lateral electric field allows for tuning of the energy levels of the quantum ring into resonance with the microcavity mode, thus providing an efficient way to control the quantum ring-microcavity coupling strength. Emission spectra of the system are discussed for several combinations of the applied magnetic and electric fields.

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Self-assembly of vertically aligned quantum ring-dot structure by Multiple Droplet Epitaxy

Cited by 25 publications

References 20 publications

Electronic structure of vertically coupled quantum dot-ring heterostructures under applied electromagnetic probes. A finite-element approach

Electronic structure of vertically coupled quantum dot-ring heterostructures under applied electromagnetic probes. A finite-element approach

Exciton–Exciton Interactions in Coaxial Double Quantum Rings

Physics of Quantum Rings

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