Proposed Robust and High-Fidelity Preparation of Excitons and Biexcitons in Semiconductor Quantum Dots Making Active Use of Phonons

Glässl, Martin; Barth, Andreas M.; Axt, Vollrath M.

doi:10.1103/physrevlett.110.147401

Cited by 91 publications

(125 citation statements)

References 34 publications

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“…While electron-phonon interactions usually lead to performance degradation of devices, they may also open up possibilities to tune device characteristics by virtue of material and geometry design and appropriate control of ambient properties as well as external parameters. Recent examples of phonon tuning applications include the realization of population inversion in InGaAs quantum dot systems [1][2][3] and phonon-assisted gain in semiconductor quantum dot masers [4][5][6]. It was demonstrated in Refs.…”

Section: Introductionmentioning

confidence: 99%

Unified treatment of coupled optical and acoustic phonons in piezoelectric cubic materials

Willatzen

Wang

2015

Phys. Rev. B

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A unified treatment of coupled optical and acoustic phonons in piezoelectric cubic materials is presented whereby the lattice displacement vector and the internal ionic displacement vector are found simultaneously. It is shown that phonon couplings exist in pairs only; either between the electric potential and the lattice displacement coordinate perpendicular to the phonon wave vector or between the two other lattice displacement components. The former leads to coupled acousto-optical phonons by virtue of the piezoelectric effect. We then establish three new conjectures that entirely stem from piezoelectricity in a cubic structured material slab. First, it is shown that isolated optical phonon modes generally cannot exist in piezoelectric cubic slabs. Second, we prove that confined acousto-optical phonon modes only exist for a discrete set of in-plane wave numbers in piezoelectric cubic slabs. Third, it is shown that coupled acousto-optical phonons do not exist at the longitudinal-optical (LO) phonon frequency where the dielectric constant vanishes.

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Section: Introductionmentioning

confidence: 99%

Unified treatment of coupled optical and acoustic phonons in piezoelectric cubic materials

Willatzen

Wang

2015

Phys. Rev. B

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“…The phonon-coupling between the dressed states turns out to be sufficiently strong, such that the final values plotted in Fig. 15, which document a preparation of an almost pure biexciton state, are reached on a time scale of ∼ 10 ps [211]. In order to realize such short preparation times, one exploits the fact that the phonon-induced relaxation strongly depends on the system parameters such as the QD size and the electron-phonon coupling strength as well as on the driving parameters such as the pulse area and the pulse length.…”

Section: Phonon Assisted Exciton and Biexciton Preparationmentioning

confidence: 98%

“…Similar to the biexciton state preparation also the single exciton state can be efficiently populated by a phonon-assisted process [211]. This is achieved by a circularly polarized excitation -in order to suppress the coupling to the biexciton -by a laser pulse which is positively detuned with respect to the ground state-toexciton transition.…”

Section: Phonon Assisted Exciton and Biexciton Preparationmentioning

confidence: 99%

“…Recent calculations have shown that under realistic excitation conditions a highfidelity and robust phonon-assisted preparation targeted at either the exciton or the biexciton is indeed possible on a picosecond time scale [211]. As an example, Fig.…”

Section: Phonon Assisted Exciton and Biexciton Preparationmentioning

confidence: 99%

“…Since for increasing positive detuning the lower dressed state becomes more and more exciton-like, there should be no [211].…”

Section: Phonon Assisted Exciton and Biexciton Preparationmentioning

confidence: 99%

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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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Optical Signals to Monitor the Dynamics of Phonon‐Modified Rabi Oscillations in a Quantum Dot

Klaßen

Reiter

2021

Annalen der Physik

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Semiconductor quantum dots are solid state few‐level systems which can interact strongly with light. As such, they can be used as a single photon source or to perform solid‐state quantum‐optics experiments. A major difference to atoms is the interaction with the lattice vibrations, that is, the phonons, which strongly affect the optical signals from a quantum dot. In this paper, we calculate the time‐resolved pump‐probe signals from a continuously driven quantum dot accounting for detuned excitation and electron–phonon interaction. We provide analytical equations giving insight into the different phenomena observed in the spectra like an oscillation between absorptive and dispersive line shapes. For detuned excitation, the electron–phonon interaction can lead to phonon‐assisted occupation of the exciton, giving rise to a strong asymmetry in the dynamical behavior depending on the sign of the detuning. The time‐resolved spectra monitor this relaxation path, which helps understanding the effect of electron–phonon interaction in quantum dots.

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Proposed Robust and High-Fidelity Preparation of Excitons and Biexcitons in Semiconductor Quantum Dots Making Active Use of Phonons

Cited by 91 publications

References 34 publications

Unified treatment of coupled optical and acoustic phonons in piezoelectric cubic materials

Unified treatment of coupled optical and acoustic phonons in piezoelectric cubic materials

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

Optical Signals to Monitor the Dynamics of Phonon‐Modified Rabi Oscillations in a Quantum Dot

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