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

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...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2013-05, Vol.25 (20), p.202202-202202
Main Authors: Fras, F, Bernardot, F, Eble, B, Bernard, M, Siarry, B, Miard, A, Lemaître, A, Testelin, C, Chamarro, M
Format: Article
Language:English
Subjects:
Condensed Matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Indium arsenides
Joining
Magnetic fields
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Physics
Polarization
Polarized light
Quantum dots
Trions
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/25/20/202202