Self-Assembly of Concentric Quantum Double Rings

Mano, Takaaki; Kuroda, Takashi; Sanguinetti, S.; Ochiai, Tetsuyuki; Tateno, T.; Kim, Jong-Su; Noda, Takeshi; Kawabe, Mitsuo; Sakoda, Kazuaki; Kido, G.; Koguchi, Nobuyuki

doi:10.1021/nl048192+

Cited by 385 publications

(407 citation statements)

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“…7(b)] [23,52]. In between these two extremes, more complex morphologies, such as double rings and molecules, can be obtained [30,35,37,40].…”

Section: Discussionmentioning

confidence: 99%

“…The As pressure and substrate temperature during crystallization are used to control nanostructure morphology [30,35,37,40]. Three sets of samples (P , T , and V ) were grown in this study.…”

Section: Methodsmentioning

confidence: 99%

“…A III-column element molecular beam is initially supplied for the formation of droplets on the substrate surface in vacuum, and subsequently an As flux is used for the crystallization of droplets into the III-As nanostructures. With a suitable selection of growth conditions, and by carefully controlling the group-III crystallization kinetics into a III-V semiconductor, it is possible to engineer the final shape of the nanocrystals from islands [25,[27][28][29], rings [30,31], wires [32,33], and even more complex structures [34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

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Precise shape engineering of epitaxial quantum dots by growth kinetics

et al. 2015

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We show that independent size and morphology engineering of epitaxial quantum dots can be obtained using a kinetically controlled quantum dot fabrication procedure, namely droplet epitaxy. Due to the far-from-equilibrium droplet epitaxy procedure, which is based on the crystallization, under As flux, of a nanometric droplet of Ga, independent and precise tuning of quantum dot size, aspect ratio, and faceting can be achieved. The dependence of the dot morphology on the growth conditions is interpreted and described quantitatively through a model that takes into account the crystallization kinetics of the Ga stored in the droplet under As flux.

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“…7(b)] [23,52]. In between these two extremes, more complex morphologies, such as double rings and molecules, can be obtained [30,35,37,40].…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precise shape engineering of epitaxial quantum dots by growth kinetics

et al. 2015

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“…Recent progress in nanofabrication technology allows the simulation of novel atomic physical phenomena on an artificial platform, such as presence of δ-function-like density of states on quantum dots (QD) 1,2 , realization of molecularorbital state on spatially coupled QDs 3,4 , and formation of nanometer-sized quantum rings 5,6,7,8 , which are nanoscopic analogues of benzene. Among them, fabrication of semiconductor quantum rings has triggered strong interest in realization of quantum topological phenomena, which are expected in a small systems with simply-connected geometry 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Optical transitions in quantum ring complexes

et al. 2005

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Making use of a droplet-epitaxial technique, we realize nanometer-sized quantum ring complexes, consisting of a well-defined inner ring and an outer ring. Electronic structure inherent in the unique quantum system is analyzed using a micro-photoluminescence technique. One advantage of our growth method is that it presents the possibility of varying the ring geometry. Two samples are prepared and studied: a single-wall ring and a concentric double-ring. For both samples, highly efficient photoluminescence emitted from a single quantum structure is detected. The spectra show discrete resonance lines, which reflect the quantized nature of the ringtype electronic states. In the concentric double-ring, the carrier confinement in the inner ring and that in the outer ring are identified distinctly as split lines. The observed spectra are interpreted on the basis of single electron effective mass calculations.

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“…From the experimental point of view, much effort has been devoted in the past decade to the fabrication of GaAs/AlGaAs concentric double quantum rings using droplet-epitaxial techniques [15][16][17] in order to study the Aharonov-Bohm effect [18] and the influence of the Coulomb interaction on the magnetic properties [17]. More recently, accurate theoretical calculations, using local spin density functional theory [19], exact diagonalization [20] and quantum Monte Carlo [21] techniques, have shown that Wigner molecules [22] are formed at low density.…”

Section: Introductionmentioning

confidence: 99%