Strong electron tunneling through mesoscopic metallic grains

Article

关键词: PHASE-TRANSITIONS;    COULOMB-BLOCKADE;    QUANTUM DYNAMICS;    JUNCTIONS;    CHARGE;    FLUCTUATIONS;    OSCILLATIONS;    BOX;   

DOI  :  10.1103/PhysRevB.56.15782

来源: SCIE

【 摘 要 】

We describe electron transport through small metallic grains with Coulomb blockade effects beyond the perturbative regime. For this purpose we study the real-time evolution of the reduced density matrix of the system. In the first part of the paper we present a diagrammatic expansion for not too high junction conductance, h/4 pi(2)e(2)R(t) less than or similar to 1, in a basis of charge states. Quantum fluctuations renormalize system parameters and lead to finite lifetime broadening in the gate-voltage-dependent differential conductance. We derive analytic results for the spectral density and the conductance in the limit where only two charge states play a role. In the second part of the paper we consider junctions with large conductance, h/4e(2)R(t) greater than or similar to 1. In this case contributions from all charge states, which broaden and overlap, become important. We analyze the problem in a quasiclassical approximation. The two complementary approaches cover the essential features of electron tunneling for all parameters. [S0163-1829(97)01948-6].

【 授权许可】

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