Manipulation of Electron Orbitals in Hard-Wall InAs/InP Nanowire Quantum Dots

Roddaro, Stefano; Pescaglini, Andrea; Ercolani, Daniele; Sorba, L.; Beltram, Fabio

doi:10.1021/nl200209m

Cited by 48 publications

(71 citation statements)

References 29 publications

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“…The name was coined by Kastner et al [20] after the discovery of quantized electronic levels inside the QDs. The amount of experiments performed in QDs and the variety of phenomena with a straight correlation to those found in atoms increased enormously over the years [21][22][23][24][25][26][27][28][29] and was mainly motivated by the vast range of technological applications of QDs as 07002-p.4…”

Section: Icec In Quantum Dotsmentioning

confidence: 99%

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Bande

Pont

Gokhberg

et al. 2015

EPJ Web of Conferences

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Abstract. The interatomic Coulombic electron capture (ICEC) process has recently been predicted theoretically for clusters of atoms and molecules. For an atom A capturing an electron e( ) it competes with the well known photorecombination, because in an environment of neutral or anionic neighboring atoms B, A can transfer its excess energy in the ultrafast ICEC process to B which is then ionized. The cross section for e( ) + A + B → A − + B + + e( ) has been obtained in an asymptotic approximation based on scattering theory for several clusters [1,2]. It was found that ICEC starts dominating the PR for distances among participating species of nanometers and lower. Therefore, we believe that the ICEC process might be of importance in the atmosphere, in biological systems, plasmas, or in nanostructured materials. As an example for the latter, ICEC has been investigated by means of electron dynamics in a model potential for semiconductor double quantum dots (QDs) [3]. In the simplest case one QD captures an electron while the outgoing electron is emitted from the other. The reaction probability for this process was found to be relatively large.

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Section: Icec In Quantum Dotsmentioning

confidence: 99%

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Bande

Pont

Gokhberg

et al. 2015

EPJ Web of Conferences

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“…In these structures some typical features of SC bulk material are prevailed [2][3][4][5] and married to typical atomic properties [6][7][8][9][10] emerging from the energy level quantization 11 in the QDs, motivating their name: artificial atoms.…”

Section: Introductionmentioning

confidence: 99%

Electron-correlation driven capture and release in double quantum dots

Pont

Bande

Cederbaum³

2016

J. Phys.: Condens. Matter

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We recently predicted that the interatomic Coulombic electron capture (ICEC) process, a longrange electron correlation driven capture process, is achievable in gated double quantum dots (DQDs). In ICEC an incoming electron is captured by one QD and the excess energy is used to remove an electron from the neighboring QD. In this work we present systematic full threedimensional electron dynamics calculations in quasi-one dimensional model potentials that allow for a detailed understanding of the connection between the DQD geometry and the reaction probability for the ICEC process. We derive an effective one-dimensional approach and show that its results compare very well with those obtained using the full three-dimensional calculations. This approach substantially reduces the computation times. The investigation of the electronic structure for various DQD geometries for which the ICEC process can take place clarify the origin of its remarkably high probability in the presence of two-electron resonances.

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“…We argue that the process could be exploited in practice. [2,[4][5][6][7] together with new phenomena handed down from the semiconductor nature of QDs [8-11] many of which endowed new technological applications to be cast into reality. In this work we concentrate on energy transfer between two QDs driven by long-range electron correlation and mediated by the capture of an electron.…”

mentioning

confidence: 99%

“…The initial notion for the name came from the quantized levels and transitions of carriers inside nanosized semiconductor structures [3] that resemble those found in atoms. A wealth of other phenomena also present in atoms have found their counterpart in QDs [2,[4][5][6][7] together with new phenomena handed down from the semiconductor nature of QDs [8][9][10][11] many of which endowed new technological applications to be cast into reality. In this work we concentrate on energy transfer between two QDs driven by long-range electron correlation and mediated by the capture of an electron.…”

mentioning

confidence: 99%

Controlled energy-selected electron capture and release in double quantum dots

Pont¹,

Bande²,

Cederbaum³

2013

Phys. Rev. B

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Highly accurate quantum electron dynamics calculations demonstrate that energy can be efficiently transferred between quantum dots. Specifically, in a double quantum dot an incoming electron is captured by one dot and the excess energy is transferred to the neighboring dot and used to remove an electron from this dot. This process is due to long-range electron correlation and shown to be operative at rather large distances between the dots. The efficiency of the process is greatly enhanced by preparing the double quantum dot such that the incoming electron is initially captured by a two-electron resonance state of the system. In contrast to atoms and molecules in nature, double quantum dots can be manipulated to achieve this enhancement. This mechanism leads to a surprisingly narrow distribution of the energy of the electron removed in the process which is explained by resonance theory. We argue that the process could be exploited in practice. [2,[4][5][6][7] together with new phenomena handed down from the semiconductor nature of QDs [8-11] many of which endowed new technological applications to be cast into reality. In this work we concentrate on energy transfer between two QDs driven by long-range electron correlation and mediated by the capture of an electron.Electron capture in single QDs is an extensively studied topic [12][13][14] due to its relevance in the development of technological applications. The capture efficiency and its time scale depend substantially on temperature, carrier density, material and geometry of the QDs [13][14][15]. The capture and the later relaxation dynamics occur through diverse physical processes such as electronphonon interactions [13,14,16,17], multiple exciton generation [12] and Auger relaxation [15], all of which can be assessed using pump-probe schemes [10,[12][13][14]17]. Capture by optical phonon emission has been investigated in single [16,18,19] as well as in double QDs [18]. So far, electronically-induced inter-dot capture processes have not been considered at all. In the present work we use numerically exact quantum dynamics to show that electron capture by one QD in a DQD becomes possible by energy transfer to the neighboring QD due to long-range electron correlation. Originally, such processes were predicted to operate between atoms [20,21] where electron capture by one atom occurs while another electron is emitted from an atom in its environment and called interatomic electronic Coulombic capture (ICEC), a name which we would like to adopt also for QDs. For completeness we mention that energy transfer between quantum wells has been studied in a different context, see, e.g., [22,23].For explicit demonstration we study a system comprised of two different QDs which we call the left and right QDs and which are described by the model potentials discussed below. Let the left potential well support a one-electron level L 0 and the right one, R 0 . Although included in the calculation, the tunneling between L 0 and R 0 is vanishingly small due to the long inter-dot di...

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Manipulation of Electron Orbitals in Hard-Wall InAs/InP Nanowire Quantum Dots

Cited by 48 publications

References 29 publications

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Electron-correlation driven capture and release in double quantum dots

Controlled energy-selected electron capture and release in double quantum dots

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