Details

Autor(en) / Beteiligte

• Fras, F.
• Eble, B.
• Desfonds, P.
• Bernardot, F.
• Testelin, C.
• Chamarro, M.
• Miard, A.
• Lemaître, A.

Titel

Two-phonon process and hyperfine interaction limiting slow hole-spin relaxation time in InAs/GaAs quantum dots

Ist Teil von

• Physical review. B, Condensed matter and materials physics, 2012-07, Vol.86 (4), Article 045306

Ort / Verlag

American Physical Society

Erscheinungsjahr

2012

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• We study the hole-spin relaxation in p-doped InAs quantum dots. Two relaxation mechanisms are evidenced, at low magnetic field (0 < or = B < or = 2T) and low temperature (2 < or = T < or = 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, (ProQuest: Formulae and/or non-USASCII text omitted) [approximate] 1 mu s super(-1). It decreases with increasing magnetic field and reaches a plateau at 0.4 mu s super(-1). At T >or = 7K, two-phonon spin-orbit process dominates and leads to a quadratic temperature dependence of (ProQuest: Formulae and/or non-USASCII text omitted) in good agreement with theory.