Detection of Single Spin Decoherence in a Quantum Dot via Charge Currents

Details Detection of Single Spin Decoherence in a Quantum Dot via Charge Currents Detection of Single Spin Decoherence in a Quantum Dot via Charge Currents

2000-11-10

arxiv.org/abs/cond-mat/0011193v1

Phys. Rev. Lett. 86, 4648 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.86.4648

We consider a quantum dot attached to leads in the Coulomb blockade regime which has a spin 1/2 ground state. We show that by applying an ESR field to the dot-spin the stationary current in the sequential tunneling regime exhibits a resonance whose line width is determined by the single-spin decoherence time T_2. The Rabi oscillations of the dot-spin are shown to induce coherent current oscillations from which T_2 can be deduced in the time domain. We describe a spin-inverter which can be used to pump current through a double-dot via spin flips generated by ESR.

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