Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots

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dc.creatorLai, C. W.
dc.creatorMaletinsky, P.
dc.creatorBadolato, A.
dc.creatorImamoglu, A.
dc.date2005-12-13
dc.date.accessioned2026-07-07T06:53:19Z
dc.date.available2026-07-07T06:53:19Z
dc.descriptionWe demonstrate dynamical nuclear spin polarization in the absence of an external magnetic field, by resonant circularly polarized optical excitation of a single electron or hole charged quantum dot. Optical pumping of the electron spin induces an effective inhomogeneous magnetic (Knight) field that determines the direction along which nuclear spins could polarize and enables nuclear-spin cooling by suppressing depolarization induced by nuclear dipole-dipole interactions. Our observations suggest a new mechanism for spin-polarization where spin exchange with an electron reservoir plays a crucial role. These experiments constitute a first step towards quantum measurement of the Overhauser field.
dc.description5 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0512269
dc.identifierhttp://arxiv.org/abs/cond-mat/0512269
dc.identifierPhys. Rev. Lett. 96, 167403 (2006)
dc.identifierdoi:10.1103/PhysRevLett.96.167403
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/105543
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleKnight Field Enabled Nuclear Spin Polarization in Single Quantum Dots
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