Phonon impact on optical control schemes of quantum dots: Role of quantum dot geometry and symmetry

Lüker, Sebastian; Kuhn, Thomas; Reiter, Doris E.

doi:10.1103/physrevb.96.245306

Cited by 34 publications

(50 citation statements)

References 52 publications

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“…2(a) and the simulations in 2(b). Note, that the dimensions of the exciton a e and a h are a spherical representations of the exciton, which leads to the same physical results as a lens-shaped model [49]. Therefore, these sizes must not be seen as the real size of the exciton wave function.…”

Section: Resultsmentioning

confidence: 98%

Rabi oscillations of a quantum dot exciton coupled to acoustic phonons: coherence and population readout

Wigger¹,

Schneider²,

Gerhardt³

et al. 2018

Optica

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While the advanced coherent control of qubits is now routinely carried out in low frequency (GHz) systems like single spins, it is far more challenging to achieve for two-level systems in the optical domain. This is because the latter evolve typically in the THz range, calling for tools of ultrafast, coherent, nonlinear optics. Using four-wave mixing micro-spectroscopy, we here measure the optically driven dynamics of a single exciton quantum state confined in a semiconductor quantum dot. In a combined experimental and theoretical approach, we reveal the intrinsic Rabi oscillation dynamics by monitoring both central exciton quantities, i.e., its occupation and the microscopic coherence, as resolved by the four-wave mixing technique. In the frequency domain this oscillation generates the Autler-Townes splitting of the light-exciton dressed states, directly seen in the four-wave mixing spectra. We further demonstrate that the coupling to acoustic phonons strongly influences the FWM dynamics on the picosecond timescale, because it leads to transitions between the dressed states.

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Section: Resultsmentioning

confidence: 98%

Rabi oscillations of a quantum dot exciton coupled to acoustic phonons: coherence and population readout

Wigger¹,

Schneider²,

Gerhardt³

et al. 2018

Optica

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show abstract

“…The cluster-expansion techniques allows to investigate the impact of different geometries of the QD in state-preparation protocols. For example the electron-phonon coupling of a spherical QD and a more realistic lens-shaped QD can explicitly be compared [96]. Interestingly, the numerical analysis shows that the QD (electronic) dynamics is hardly influenced on the actual nanostructure geometry, cf.…”

Section: Phonon-assisted Damping Of Rabi Oscillations and State Prmentioning

confidence: 99%

Non-Markovian features in semiconductor quantum optics: quantifying the role of phonons in experiment and theory

Carmele

Reitzenstein

2019

Nanophotonics

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We discuss phonon-induced non-Markovian and Markovian features in QD-based optics. We cover lineshapes in linear absorption experiments, phonon-induced incoherence in the Heitler regime, and memory correlations in two-photon coherences. To quantitatively and qualitatively understand the underlying physics, we present several theoretical models which model the non-Markovian properties of the electron-phonon interaction accurately in different regimes. Examples are the Heisenberg equation of motion approach, the polaron master equation, and Liouville-propagator techniques in the independent boson limit and beyond via the path-integral method. Phenomenological modeling overestimates typically the dephasing due to the finite memory kernel of phonons and we give instructive examples of phonon-mediated coherence such as phonon-dressed anticrossings in Mollow physics, robust quantum state preparation, cavity-feeding and the stabilization of the collapse and revival phenomenon in the strong coupling limit. * alex@itp.tu-berlin.de arXiv:1904.10905v1 [quant-ph] 24 Apr 2019 of exciting phenomena in these systems due to the ubiquitous non-Markovian electron-phonon and electron-electron dynamics. To name a few, quantum wires show phonon-enabled thermal conductivity [63] based on a universal quantum of thermal conductance [64]. Pronounced non-Markovian decoherence is demonstrated in localized nanotube excitons [32] and also phonon-assisted Anderson localization phenomena have been investigated [65]. In quantum wells, coherent acoustic oscillations are studied [66], and non-equilibrium cooling effects bottlenecked by non-Markovian phonon dynamics have been discussed [67]. Four-wave mixing techniques allow to study and characterize giant excitonic resonances [68,69], and via two-dimensional coherent spectroscopy techniques incoherent exciton-phonon Green's function can be probed and extracted in disordered quantum wells [70,71].Moreover, optical and electronic two-dimensional spectroscopy has drawn a lot interest recently, as non-Markovian, anomalous lineshapes and relaxation/scattering processes can be characterized and studied in depth. For example, the study of signatures of spatially correlated noise and non-secular effects [72] has been performed, the read-out of Rabi oscillations in QDs [73], exciton coherence at room temperature [74] investigated, systematic study of dephasing processes including quadratic electron-phonon coupling for elevated temperatures [75,76] and phonon sidebands in transition metal dichalcogenides have been demonstrated [77]. Despite the exciting results in higher-dimensional nanostructures and two-dimensional coherent spectroscopy, we focus in the following on a single material platform, semiconductor QDs. This allows us to discuss in detail instructive experimental examples in which the phonon interaction is the dominant source of decoherence and theoretical models which are capable to capture their specific details and can partially be treated even analytically. These models are, however, not li...

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“…The explicit form of the coupling matrix elements for different mechanisms can be found, e.g. in Refs [14,24,76,93].…”

Section: Carrier-phonon Interactionmentioning

confidence: 99%

“…The phonon spectral density for the flat QD has a larger ω-extension than found for the spherical QD in Figure 1 because its smallest spatial confinement corresponding to its height is smaller than the QD radius in the spherical case and thus phonons with higher energies are coupled. It should be noted, however, that since JðωÞ is a single function of a single real parameter, for any given JðωÞ (no matter whether it has been calculated for a spherical or a non-spherical QD) it is always possible to find a spherical QD model that yields the same phonon spectral density [93]. This is an important observation since from the formal representation of the dynamics within the path-integral formalism [97] it is readily seen that all phonon influences on the dynamics of the reduced electronic density matrix for a strongly confined system are mediated by JðωÞ.…”

Section: Carrier-phonon Interactionmentioning

confidence: 99%

Distinctive characteristics of carrier-phonon interactions in optically driven semiconductor quantum dots

Reiter

Kuhn

Axt

2019

Advances in Physics: X

Self Cite

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We review distinct features arising from the unique nature of the carrier-phonon coupling in self-assembled semiconductor quantum dots. Because of the discrete electronic energy structure, the pure dephasing coupling usually dominates the phonon effects, of which two properties are of key importance: The resonant nature of the dot-phonon coupling, i.e. its nonmonotonic behavior as a function of energy, and the fact that it is of super-Ohmic type. Phonons do not only act destructively in quantum dots by introducing dephasing, they also offer new opportunities, e.g. in state preparation protocols. Apart from being an interesting model systems for studying fundamental physical aspects, quantum dot and quantum dot-microcavity systems are a hotspot for many innovative applications. We discuss recent developments related to the decisive impact of phonons on key figures of merit of photonic devices like single or entangled photon sources under aspects like indistinguishability, purity and brightness. All in all it follows that understanding and controlling the carrier-phonon interaction in semiconductor quantum dots is vital for their usage in quantum information technology.

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Phonon impact on optical control schemes of quantum dots: Role of quantum dot geometry and symmetry

Cited by 34 publications

References 52 publications

Rabi oscillations of a quantum dot exciton coupled to acoustic phonons: coherence and population readout

Rabi oscillations of a quantum dot exciton coupled to acoustic phonons: coherence and population readout

Non-Markovian features in semiconductor quantum optics: quantifying the role of phonons in experiment and theory

Distinctive characteristics of carrier-phonon interactions in optically driven semiconductor quantum dots

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