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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

2008

vol. 114

issue 5

1329-1335

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.

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

2012

vol. 122

issue 6

1065-1068

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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2 Acta Physica Polonica A

1 2012

1 2008

2 Axt V.

2 Kuhn T.

2 Machnikowski P.

1 Gawarecki K.

1 Grodecka-Grad A.

1 Lüker S.

1 Reiter D.

1 Roszak K.

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

Phonon Effects on Population Inversion in Quantum Dots: Resonant, Detuned and Frequency-Swept Excitations