
TL;DR
This paper demonstrates that optical pumping of a single quantum dot can induce near-complete nuclear spin polarization, creating a stable, tiny magnetic nanomagnet through the Overhauser effect.
Contribution
It reveals a novel method to achieve and sustain nuclear spin self-polarization in quantum dots, effectively turning them into nanomagnets.
Findings
Nuclear spin polarization reaches nearly 100%.
The nuclear polarization creates a stable effective magnetic field.
Quantum dots act as tiny ferromagnetic nanomagnets.
Abstract
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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