Two-phonon process and hyperfine interaction limiting slow hole-spin relaxation time in InAs/GaAs quantum dots
| Autor: | F. Fras, Maria Chamarro, B. Eble, Audrey Miard, Frédéric Bernardot, Pascal Desfonds, Christophe Testelin, Aristide Lemaître |
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| Přispěvatelé: | Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
III-V semiconductors Condensed matter physics Spins Phonon Quantum dots Relaxation (NMR) 02 engineering and technology Spin relaxation and scattering 021001 nanoscience & nanotechnology Condensed Matter Physics Coupling (probability) Spin relaxation time 01 natural sciences Optical creation of spin polarized carriers Electronic Optical and Magnetic Materials Magnetic field hyperfine interaction [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] Quantum dot 0103 physical sciences 010306 general physics 0210 nano-technology phonon Hyperfine structure |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2012, 86, pp.45306. ⟨10.1103/PHYSREVB.86.045306⟩ Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 86, pp.45306. ⟨10.1103/PHYSREVB.86.045306⟩ |
| ISSN: | 1098-0121 1550-235X |
| DOI: | 10.1103/PHYSREVB.86.045306⟩ |
| Popis: | We study the hole-spin relaxation in p-doped InAs quantum dots. Two relaxation mechanisms are evidenced, at low magnetic field ($0\ensuremath{\le}B\ensuremath{\le}2T$) and low temperature ($2\ensuremath{\le}T\ensuremath{\le}50K$), by using a pump-probe configuration and a recent experimental technique working in the frequency domain. At $T=2K$, the coupling to nuclear spins and the hole wave-function inhomogeneity fix the hole-spin relaxation rate value, ${\ensuremath{\Gamma}}_{1}^{h}\ensuremath{\approx}1\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}{\mathrm{s}}^{\ensuremath{-}1}$. It decreases with increasing magnetic field and reaches a plateau at 0.4 $\ensuremath{\mu}{\mathrm{s}}^{\ensuremath{-}1}$. At $T\ensuremath{\ge}7K$, two-phonon spin-orbit process dominates and leads to a quadratic temperature dependence of ${\ensuremath{\Gamma}}_{1}^{h}$, in good agreement with theory. |
| Databáze: | OpenAIRE |
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