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Taking account of the electron--electron (hole) and
electron--hole interactions, the tunneling processes of the main
quantum dot (QD) Coulomb-coupled with a second quantum dot embedded
in n--n junction have been investigated. The eighteen resonance
mechanisms involved in the tunneling processes of the system have
been identified. It is found that the tunneling current depends
sensitively on the electron occupation number in the second quantum
dot. When the electron occupation number in the second dot is tiny,
both the tunneling current peaks and the occupation number plateaus
in the main QD are determined by the intra-resonance mechanism. The
increase of the electron occupation number in the second dot makes
the inter-resonance mechanism participate in the transport processes.
The competition between the inter and intra resonance mechanisms
persists until the electron occupation number in the second dot
reaches around unity, leading to the consequence that the
inter-resonance mechanisms completely dominate the tunneling
processes. 相似文献
2.
Coherent Dynamics of Direct-Current-Driven Quantum-Dot-Array with Two Time-Dependent Embedded Impurities 下载免费PDF全文
The coherent dynamics of dc-driven quantum-dot array with two embedded time-dependent impurities is investigated, the exact crossings and avoided crossings in the quasienergies are associated with the evolution dynamics of the electron by the introduction of the envelope lines of the site's maximum returning probability. Through a perturbative scheme, the time-dependent Hamiltonian is replaced by an equivalent static one, whose structure reveals the new quantum tunnelling mechanism in the time-periodic driving system and sheds light on the alternative interpretation of dynamic localization and delocalization. 相似文献
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