Decay and persistence of spatial coherence during phonon-assisted relaxation in double quantum dots

Karwat, Paweł; Machnikowski, Paweł

doi:10.1103/physrevb.91.125428

Cited by 8 publications

(6 citation statements)

References 27 publications

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“…A further challenge is the coupling of the QD to phonons, in particular since phonon influences on the QD dynamics are typically not well described by Born-Markov rate equations [26]. Thus, more sophisticated approaches are required, like the correlation expansion [27][28][29] or polaron master equations [14,22,[30][31][32].…”

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confidence: 99%

Nonlinear cavity feeding and unconventional photon statistics in solid-state cavity QED revealed by many-level real-time path-integral calculations

et al. 2017

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The generation of photons in a microcavity coupled to a laser-driven quantum dot interacting with longitudinal acoustic (LA) phonons is studied in the regime of simultaneously strong driving and strong dot-cavity coupling. The stationary cavity photon number is found to depend in a nontrivial way on the detuning between the laser and the exciton transition in the dot. In particular, the maximal efficiency of the cavity feeding is obtained for detunings corresponding to transition energies between cavity-dressed states with excitation numbers larger than one. Phonons significantly enhance the cavity feeding at large detunings. In the strong-driving, strong-coupling limit, the photon statistics is highly non-Poissonian. While without phonons a double-peaked structure in the photon distribution is predicted, phonons make the photon statistics thermal-like with very high effective temperatures ∼ 10 5 K, even for low phonon temperatures ∼ 4 K. These results were obtained by numerical calculations where the driving, the dot-cavity coupling and the dot-phonon interactions are taken into account without approximations. This is achieved by a reformulation of an exact iterative path-integral scheme which is applicable for a large class of quantum-dissipative systems and which in our case reduces the numerical demands by 15 orders of magnitude.

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confidence: 99%

Nonlinear cavity feeding and unconventional photon statistics in solid-state cavity QED revealed by many-level real-time path-integral calculations

et al. 2017

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“…The master equation approach is a standard workhorse for treating quantum dissipative systems [121,122]. Master equations have been derived for the systems considered in this review on different levels of complexity [20,[123][124][125][126][127][128][129]. One approach, which lately has attracted much attention, is the polaron master equation (PME) [130][131][132].…”

Section: Theoretical Approachesmentioning

confidence: 99%

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

Reiter

Kuhn

Axt

2019

Advances in Physics: X

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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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“…Although many studies have been made on the spatial coherence of the electron wave function in quantumimpurity systems, the temporal coherence of the same remains to be studied due to the difficulties involved in dealing with the time phase coherence and time memory effect of the electrons 12,13 . There have been many studies on the transport properties of quantum-impurity systems.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Transport Characteristics of Side-Coupled Double Quantum-Impurity Systems

Wang,

Wei

2021

Preprint

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A systematic study is made on the time-dependent dynamic transport characteristics of the sidecoupled double quantum-impurity system based on the hierarchical equations of motion. It is found that the transport current behaves like a single quantum dot when the coupling strength is low during tunneling or coulomb coupling. The dynamic current oscillates due to the temporal coherence of the electron tunneling device only when the tunneling transition is coupled. The oscillation frequency of the transport current is related to the step voltage applied by the lead, while the T , e-e interaction U and the bandwidth W have little influence. The amplitude of the current oscillation exists in positive correlation with W and negative correlation with U . With the increase in coupling t12 between impurities, the ground state of the system changes from a Kondo singlet of one impurity to a spin-singlet of two impurities. Moreover, lowering the temperature could promote the Kondo effect to intensify the oscillation of the dynamic current. When only the coulomb transition is coupled, it is found that the two split-off Hubbard peaks move upward and have different interference effects on the Kondo peak at the Fermi surface with the increase in U12, from the dynamics point of view.

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Decay and persistence of spatial coherence during phonon-assisted relaxation in double quantum dots

Cited by 8 publications

References 27 publications

Nonlinear cavity feeding and unconventional photon statistics in solid-state cavity QED revealed by many-level real-time path-integral calculations

Nonlinear cavity feeding and unconventional photon statistics in solid-state cavity QED revealed by many-level real-time path-integral calculations

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

Dynamic Transport Characteristics of Side-Coupled Double Quantum-Impurity Systems

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