Interplay between the Coulomb blockade and resonant tunneling studied by the Keldysh Green’s-function method

Abstract

A theory of tunneling through a quantum dot is presented which enables us to study combined effects of Coulomb blockade and discrete energy spectrum of the dot. The expression of tunneling current is derived from the Keldysh Green's function method, and is shown to automatically satisfy the conservation at DC current of both junctions.

Transport properties in spherical quantum dots: Orbital-blockade and spin-blockade effects

“…Several approaches, such as charging model, 1 correlated electron model, 2 Green's function, 3 and numerical methods ͑as Lanczos algorithm͒, 4 have been used in order to obtain the many-particle eigenstates and to study the transport properties in these novel systems. When the electronic density is small, a noncorrelated electron approach, such as the charging model, becomes a gross approximation and a microscopic treatment of the electronelectron interaction is required in order to reach a better understanding of the main processes taking place inside the system.…”