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The role of heavy-light-hole mixing on the optical initialization of hole spin in InAs quantum dots

Identifieur interne : 000338 ( Main/Repository ); précédent : 000337; suivant : 000339

The role of heavy-light-hole mixing on the optical initialization of hole spin in InAs quantum dots

Auteurs : RBID : Pascal:13-0208731

Descripteurs français

Pascal (Inist)
- Polarisation circulaire, Transition optique, Etat excité, Trion, Interaction hyperfine, Polarisation spin, Effet champ magnétique, Spectrométrie pompe sonde, Arséniure d'indium, Point quantique, Arséniure de gallium, Semiconducteur III-V, InAs.

English descriptors

KwdEn :
- Circular polarization, Excited states, Gallium arsenides, Hyperfine interactions, III-V semiconductors, Indium arsenides, Magnetic field effects, Optical transition, Pump probe spectrometry, Quantum dots, Spin polarization, Trion.

Abstract

The initialization of a resident hole spin by the absorption of a circularly polarized light at resonance involves the formation of an excited state called a trion state. For a pure heavy hole, this optical initialization is mediated by the hyperfine electron-nuclear coupling in the trion state. We show here that for a mixed-hole spin an additional mechanism for the optical initialization appears, associated to 'crossed transitions'; it becomes dominant and keeps a high level of hole spin polarization when the magnetic field screens the electron-nuclear interaction. Finally, using a simple model, we obtain a good theoretical agreement with pulsed pump-probe experiments.

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Pascal:13-0208731

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<term>Indium arsenides</term>
<term>Magnetic field effects</term>
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<front><div type="abstract" xml:lang="en">The initialization of a resident hole spin by the absorption of a circularly polarized light at resonance involves the formation of an excited state called a trion state. For a pure heavy hole, this optical initialization is mediated by the hyperfine electron-nuclear coupling in the trion state. We show here that for a mixed-hole spin an additional mechanism for the optical initialization appears, associated to 'crossed transitions'; it becomes dominant and keeps a high level of hole spin polarization when the magnetic field screens the electron-nuclear interaction. Finally, using a simple model, we obtain a good theoretical agreement with pulsed pump-probe experiments.</div>
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The role of heavy-light-hole mixing on the optical initialization of hole spin in InAs quantum dots

The role of heavy-light-hole mixing on the optical initialization of hole spin in InAs quantum dots

Descripteurs français

English descriptors

Abstract

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Links to Exploration step

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