Electrical Control of Interdot Electron Tunneling in a Double InGaAs Quantum-Dot Nanostructure

Müller, Kai; Bechtold, A.; Ruppert, Claudia; Zecherle, M.; Reithmaier, G.; Bichler, Max; Krenner, Hubert J.; Abstreiter, G.; Holleitner, Alexander W.; Villas‐Bôas, J. M.; Betz, M.; Finley, Jonathan J.

doi:10.1103/physrevlett.108.197402

Cited by 89 publications

(96 citation statements)

References 15 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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show abstract

“…This coupling, which can be controlled to a large degree by an external electric field, has been the subject of a large amount of work over the past years investigating both excitonic [103,104,105] and biexcitonic transitions [106,107]. In particular close to a resonance between spatially direct and indirect exciton states phonon-induced transitions can be strongly enhanced [108,73,109,110], which can also be interpreted as phonon-assisted tunneling [111,112]. The formation of a molecular polaron can give rise to a phonon-induced optical transparency [113].…”

Section: Quantum Dot Modelmentioning

confidence: 99%

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Reiter

Kuhn

Glässl

et al. 2014

J. Phys.: Condens. Matter

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Abstract. For many applications of semiconductor quantum dots in quantum technology a well controlled state preparation of the quantum dot states is mandatory. Since quantum dots are embedded in the semiconductor matrix, the interaction with phonons plays often a major role in the preparation process. In this review, we discuss the influence of phonons on three basically different optical excitation schemes which can be used for the preparation of exciton, biexciton, and superposition states: a resonant excitation leading to Rabi rotations in the excitonic system, an excitation with chirped pulses exploiting the effect of adiabatic rapid passage, and an off-resonant excitation giving rise to a phononassisted state preparation. We give an overview over experimental and theoretical results showing the role of the phonons and compare the performance of the schemes for state preparation.

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“…This well-known spectrum of excitons in an electric field 13,14 is composed of spatially direct and indirect exciton states, clearly distinguishable by the small and large slope of the field dependence of their energies, respectively. If two such states are tuned into the resonance (and if the symmetry of the states is such that selection rules are met) avoided crossing appears in the energy spectrum [13][14][15][16][17] . In Fig.…”

Section: A Carrier System and Its Modelmentioning

confidence: 99%

“…In particular, a double quantum dot (DQD) structure supports spatially direct and indirect states with different dipole moments, the energy of which can be tuned in a broad range by applying an axial electric field [13][14][15][16][17] . Recently, the spectrum of such a system was mapped out by combined spectroscopy techniques and successfully modeled using an 8-band k·p theory in the envelope-function approximation 18 .…”

Section: Introductionmentioning

confidence: 99%

Polaron resonances in two vertically stacked quantum dots

Karwat¹,

Gawarecki²,

Machnikowski³

2017

Phys. Rev. B

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In this work, we present a theoretical study of polaron states in a double quantum dot system. We present realistic calculations which combine 8 band k·p model, configuration interaction approach and collective modes method. We investigate the dependence of polaron energy branches on axial electric field. We show that coupling between carriers and longitudinal optical phonons via Fröhlich interaction leads to qualitative and quantitative reconstruction of the optical spectra. In particular, we study the structure of resonances between the states localized in different dots. We show that p-shell states are strongly coupled to the phonon replicas of s-shell states, in contrast to the weak direct s-p coupling. We discuss also the dependence of the phonon-assisted tunnel coupling strength on the separation between the dots.

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Electrical Control of Interdot Electron Tunneling in a Double InGaAs Quantum-Dot Nanostructure

Cited by 89 publications

References 15 publications

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

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

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Polaron resonances in two vertically stacked quantum dots

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