Smirnov, Sergey and Grifoni, Milena
Spin-channel Keldysh field theory for weakly interacting quantum dots.
Phys. Rev. B 85, p. 195310.
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Other URL: http://link.aps.org/doi/10.1103/PhysRevB.85.195310
We develop a low-energy nonequilibrium field theory for weakly interacting quantum dots. The theory is based on the Keldysh field integral in the spin channel of the quantum dot described by the single-impurity Anderson Hamiltonian. The effective Keldysh action is a functional of the Hubbard-Stratonovich magnetization field decoupling the quantum dot spin channel. We expand this action up to the ...
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