Self-excited Oscillations of Charge-Spin Accumulation Due to Single-electron Tunneling

Details Self-excited Oscillations of Charge-Spin Accumulation Due to Single-electron Tunneling Self-excited Oscillations of Charge-Spin Accumulation Due to Single-electron Tunneling

2010-04-05

arxiv.org/abs/1004.0651v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.82.125311

We theoretically study electronic transport through a layer of quantum dots connecting two metallic leads. By the inclusion of an inductor in series with the junction, we show that steady electronic transport in such a system may be unstable with respect to temporal oscillations caused by an interplay between the Coulomb blockade of tunneling and spin accumulation in the dots. When this instability occurs, a new stable regime is reached, where the average spin and charge in the dots oscillate periodically in time. The frequency of these oscillations is typically of the order of 1GHz for realistic values of the junction parameters.

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