Adiabatic Pumping in Interacting Systems

Details Adiabatic Pumping in Interacting Systems Adiabatic Pumping in Interacting Systems

2005-09-18

arxiv.org/abs/cond-mat/0509467v1

Phys. Rev. Lett. 96, 166802 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages and 1 figure

Scientific paper

A dc current can be pumped through an interacting system by periodically varying two independent parameters such as magnetic field and a gate potential. We present a formula for the adiabatic pumping current in general interacting systems, in terms of instantaneous properties of the system, and find the limits for its applicability. This formula generalizes the scattering approach for noninteracting pumps. We study the pumped spin in a system that exhibits the two-channel Kondo effect as an application of the adiabatic pumping formula. We find that a quantized spin of $\hbar$ is transferred between the two channels as the temperature approaches zero, and discuss the non-Fermi liquid features of this system at finite temperatures.

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