Two-loop approximation in the Coulomb blockade problem
نویسندگان
چکیده
We study Coulomb blockade ~CB! oscillations in the thermodynamics of a metallic grain connected to a lead by a tunneling contact with a large conductance g0 in a wide temperature range, ECg0 e0,T,EC , where EC is the charging energy. Using the instanton analysis and the renormalization-group approach we obtain our main result, the temperature dependence of the amplitude of CB oscillations, which differs from the previously obtained results. Assuming that at T,ECg0 e2g0/2 the oscillation amplitude weakly depends on temperature we estimate the magnitude of CB oscillations in the ground-state energy as }ECg0 e2g0/2.
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