Physics

Single-Spin Memory

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Science  08 Sep 2000:
Vol. 289, Issue 5485, pp. 1653-1655
DOI: 10.1126/science.289.5485.1653e

The ultimate limit for controlling electronic logic would be to use the spin state of a single electron. Recher et al. address the problem of controlling the spin dynamics in nanostructures by proposing a quantum dot as the basic building block for single-electron controlled-spin systems. In the presence of a magnetic field and in the Coulomb-blockade regime, the highest, singly occupied energy level of the dot is spin polarized, so that only electrons with opposite spin to that of the dot can pass through it, thus creating an efficient single-spin filter. The dot can function as a single-spin memory when its electrical contacts are also spin-polarized—the electron occupancy being detected with electron spin resonance techniques. — ISO

Phys. Rev. Lett. 85, 1962 (2000).

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