Dephasing in the adiabatic rapid passage in quantum dots: Role of phonon-assisted biexciton generation

Gawarecki, Krzysztof; Lüker, Sebastian; Reiter, Doris E.; Kuhn, Thomas; Glässl, Martin; Axt, Vollrath M.; Grodecka-Grad, Anna; Machnikowski, Paweł

doi:10.1103/physrevb.86.235301

Cited by 22 publications

(32 citation statements)

References 24 publications

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“…In this case, also for positive chirps the efficiency of exciton state preparation may be reduced due to a phonon-assisted generation of the biexciton, which becomes important for small biexciton binding energies [121]. On the other hand, this also opens up the possibility of a direct preparation of the biexciton state using ARP, a process which is very attractive because of the high potential use of biexciton states in quantum information technology [208,207,209].…”

Section: Excitation With Chirped Laser Pulsesmentioning

confidence: 99%

“…Most often, these methods fully account for the dotlight coupling but treat the exciton-phonon interaction within further approximations. Examples of such approaches are the time-convolutionless approach [116,120,121], the correlation expansion [122,123,124,125,126], different types of master equations [116,53,64,127,88,128,93] or time-dependent perturbation theory [129,125]. For the Hamiltonian dynamics within the model established by Eqs.…”

Section: Theoretical Methodsmentioning

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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Section: Excitation With Chirped Laser Pulsesmentioning

confidence: 99%

Section: Theoretical Methodsmentioning

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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“…(15) was checked for selected cases using an iterative time-ordering Chebyshev (ITOC) expansion [45,46]. This highly accurate approach adds a supplementary iterative loop to the Chebyshev expansion (15) to account for the timeordering operator [45]. As a consequence of this additional loop, the error propagated during the dynamics using the ITOC expansion can be brought to machine precision even for intense laser pulses and large time increments.…”

Section: Non-markovian Quantum Jump For An Explicitly Time-dependmentioning

confidence: 99%

“…Instead, the evolution operator is expanded in a Chebyshev series [39]: (15) where a i are the expansion coefficients and φ i are the complex Chebyshev polynomials defined by their recurrence relation [39]. A total of N C = 50 polynomials were used in the expansion, and a time increment of t = 10 fs was set to solve the dynamics.…”

Section: Non-markovian Quantum Jump For An Explicitly Time-dependmentioning

confidence: 99%

“…However, the final biexciton population obtained via this simple scheme depends strongly on the intensity and duration of the laser pulse and is therefore not robust against experimental parameters. To overcome this difficulty, it has recently been proposed to use adiabatic rapid passage (ARP) techniques [6] to obtain a robust control of the final exciton [7][8][9][10][11][12] or biexciton [13][14][15][16] population of isolated QDs at finite temperature.…”

Section: Introductionmentioning

confidence: 99%

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Cooperative biexciton generation and destructive interference in coupled quantum dots using adiabatic rapid passage

Renaud

Grozema

2014

Phys. Rev. B

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We report numerical simulations of biexciton generation in coupled quantum dots (CQDs) placed in a static electric field and excited by a chirped laser pulse. Our simulations explicitly account for exciton-phonon interactions at finite temperature using a non-Markovian quantum jump approach to solve the excitonic dynamics. In the case of noninteracting quantum dots, the biexciton generation is severely limited by the biexciton binding energy. We demonstrate that the application of an axial electric field along the CQDs can yield a favorable excitonic level alignment that compensates for the biexciton binding energy and yields an optimum biexciton generation. On the contrary, well-defined values of the electric field lead to destructive quantum interference that completely inhibits the biexciton generation. We therefore demonstrate here the potential of chirped pulse excitations of CQDs for high-efficiency biexciton generation but also for the control of unique optoelectronic properties of complex quantum systems.

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Adiabatic rapid passage in quantum dots: phonon‐assisted decoherence and biexciton generation

Gawarecki

Lüker

Reiter

et al. 2013

Phys. Status Solidi C

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We study the evolution of a quantum dot controlled by a frequency-swept (chirped), linearly polarized laser pulse in the presence of carrier-phonon coupling. The final occupation of the exciton state is limited both due to phonon-induced transitions between the adiabatic spectral branches and because of phonon-assisted transitions to the biexciton state.When the biexciton shift is large enough, the quantum dot can be modeled as a two-level system, which corresponds to excitation with circularly polarized light. For this case, we compare different methods of simulations: (i) a time convolutionless method, (ii) correlation expansion and (iii) path integrals. We show that results obtained from these methods agree perfectly at low temperatures.Copyright line will be provided by the publisher 2 Model We consider a QD modeled as a four-level system driven by a laser pulse with either circular or linear

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Dephasing in the adiabatic rapid passage in quantum dots: Role of phonon-assisted biexciton generation

Cited by 22 publications

References 24 publications

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

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

Cooperative biexciton generation and destructive interference in coupled quantum dots using adiabatic rapid passage

Adiabatic rapid passage in quantum dots: phonon‐assisted decoherence and biexciton generation

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