科研之友
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摘要
We analyze transport properties of coherent triple-quantum-dot systems in triangular geometry, weakly coupled to external leads. The real-time diagrammatic technique up to the second order is used to determine conductance and shot noise in the sequential tunneling and cotunneling regimes. In particular, we focus on the transport regime where the triple dot is trapped in a dark state and the system is in the interchannel Coulomb blockade, which leads to negative differential conductance. We show that although sequential transport is then exponentially suppressed, the blockade can be lifted by cotunneling processes. It is also shown that the shot noise in this transport regime is generally super-Poissonian, but the corresponding Fano factor is reduced when the cotunneling processes are included.
- 出版日期2011-5-5
