Non-adiabatic pumping through interacting quantum dots

Details Non-adiabatic pumping through interacting quantum dots Non-adiabatic pumping through interacting quantum dots

2009-04-10

arxiv.org/abs/0904.1687v2

Phys. Rev. Lett. 103, 136801 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.103.136801

We study non-adiabatic two-parameter charge and spin pumping through a single-level quantum dot with Coulomb interaction. For the limit of weak tunnel coupling and in the regime of pumping frequencies up to the tunneling rates, $\Omega \lesssim \Gamma/\hbar$, we perform an exact resummation of contributions of all orders in the pumping frequency. As striking non-adiabatic signatures, we find frequency-dependent phase shifts in the charge and spin currents, which allow for an effective single-parameter pumping as well as pure spin without charge currents.

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