From the Zero--bias Anomaly to the Coulomb Blockade: an Exactly Solvable Model.
Alex Kamenev, Yuval Gefen
Abstract
A microscopic theory of zero wavelength (q=0) interaction in finite--size systems is proposed. Its exact solution interpolates between the Coulomb blockade and the perturbative Altshuler--Aronov theory, in the strong and weak interaction limits respectively. The tunneling density of states and the quasiparticle life--time are calculated. The physical nature of the q=0 component of the interaction is discussed.
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