The Nuclear Spin Nanomagnet

Details The Nuclear Spin Nanomagnet The Nuclear Spin Nanomagnet

2007-05-15

arxiv.org/abs/0705.2167v2

Physical Review Letters 99 256405 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, including 3 figures. Short version has been accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.99.256405

Linearly polarized light tuned slightly below the optical transition of the negatively charged exciton (trion) in a single quantum dot causes the spontaneous nuclear spin polarization (self-polarization) at a level close to 100%. The effective magnetic field of spin-polarized nuclei brings the optical transition energy into resonance with photon energy. The resonantly enhanced Overhauser effect sustains the stability of the nuclear self-polarization even in the absence of spin polarization of the quantum dot electron. As a result the optically selected single quantum dot represents a tiny magnet with the ferromagnetic ordering of nuclear spins - the nuclear spin nanomagnet.

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