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One and Two Phonon Assisted Transitions between Exciton Spin States in a Quantum Dot

100%
Roszak K., Machnikowski P., Axt V., Kuhn T.
Acta Physica Polonica A
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2008
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vol. 114
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issue 5
1329-1335
EN
Exciton spin decay is studied in a self-assembled InAs/GaAs quantum dot. The spin relaxation results from an interplay of two factors: the Bir-Pikus Hamiltonian and the short-range exchange interaction, leading to one and two phonon assisted transitions. We establish a hierarchy between the resulting transition rates and show the dominating role of transverse phonons for all the transitions.
2
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Spatio-Temporal Dynamics of Carrier Capture Processes: Simulation of Optical Signals

100%
Lengers F., Rosati R., Kuhn T., Reiter D.
|
EN
We perform simulations of time-resolved optical experiments of carrier-capture processes in a quantum wire-dot system. Scattering of charge carriers with optical phonons of the quantum wire can result in transitions from the continuum states of the quantum wire to discrete states of the quantum dot. We treat the scattering of carriers with optical phonons within a Lindblad single-particle approach. By considering the coupling of carriers to a light field we are able to simulate pump-probe experiments which are shown to be capable of measuring the captured populations. We further discuss the influence of the Coulomb interaction on the obtained spectra.
3
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Carrier Trapping in a Quantum Dash: Optical Signatures

100%
Kaczmarkiewicz P., Machnikowski P., Kuhn T.
Acta Physica Polonica A
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2012
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vol. 122
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issue 6
997-1000
EN
We theoretically study the optical properties and the electronic structure of highly elongated quantum dots (quantum dashes) and show how geometrical fluctuations affect the excitonic spectrum of the system. The dependence of the absorption intensities on the geometrical properties (depth and length) of the trapping center in a quantum dash is analyzed and the dependence of the degree of the linear polarization on these geometrical parameters is studied.
4
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Phonon Effects on Population Inversion in Quantum Dots: Resonant, Detuned and Frequency-Swept Excitations

76%
Reiter D., Lüker S., Gawarecki K., Grodecka-Grad A., Machnikowski P., Axt V., Kuhn T.
Acta Physica Polonica A
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2012
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vol. 122
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issue 6
1065-1068
EN
The effect of acoustic phonons on different light-induced excitations of a semiconductor quantum dot is investigated. Resonant excitation of the quantum dot leads to the Rabi oscillations, which are damped due to the phonon interaction. When the excitation frequency is detuned, an occupation can only occur due to phonon absorption or emission processes. For frequency-swept excitations a population inversion is achieved through adiabatic rapid passage, but the inversion is also damped by phonons. For all three scenarios the influence of the phonons depends non-monotonically on the pulse area.
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