Non-equilibrium transport through a vertical quantum dot in the absence of spin-flip energy relaxation

Details Non-equilibrium transport through a vertical quantum dot in the absence of spin-flip energy relaxation Non-equilibrium transport through a vertical quantum dot in the absence of spin-flip energy relaxation

2002-04-15

arxiv.org/abs/cond-mat/0204314v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

accepted for publication in Phys. Rev.Lett

Scientific paper

10.1103/PhysRevLett.88.236802

We investigate non-equilibrium transport in the absence of spin-flip energy relaxation in a few-electron quantum dot artificial atom. Novel non-equilibrium tunneling processes involving high-spin states which cannot be excited from the ground state because of spin-blockade, and other processes involving more than two charge states are observed. These processes cannot be explained by orthodox Coulomb blockade theory. The absence of effective spin relaxation induces considerable fluctuation of the spin, charge, and total energy of the quantum dot. Although these features are revealed clearly by pulse excitation measurements, they are also observed in conventional dc current characteristics of quantum dots.

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