耦合双原子分子晶体管中的可调谐Fano共振
Tunable Fano resonance in a parallelly coupled diatomic molecular transistor
摘要：
我们研究电子输运通过一个双原子分子耦合到无限的源极和漏极接触。我们利用一个模型哈密顿涉及哈伯德长期使用最近开发的复杂的源和汇潜力的接触建模。当Hubbard相互作用开启时，对称耦合系统的零偏透射谱随Fermi能量的变化呈现Fano线形，当$U$较大时，Fano线形变宽并向更高能量移动，最终消失.同时，位于非相互作用极限的键共振处的Breit-Wigner共振仍然存在，但在无限$U$极限时，其位置移动了分子中原子间耦合的两倍，线宽减小了一半.我们把这种现象归因于其中一个传输通道由于库仑阻塞而不可用。
英文摘要：
We investigate electron transport through a diatomic molecule parallelly coupled to infinite source and drain contacts. We utilize a model Hamiltonian involving a Hubbard term in which the contacts are modeled using recently developed complex source and sink potentials. The zero bias transmission spectrum for a symmetrically coupled system as a function of the Fermi energy acquires a Fano lineshape as the Hubbard interaction is turned on. For large values of $U$, the Fano lineshape broadens and shifts to higher energy values disappearing eventually. Meanwhile, the Breit-Wigner resonance located at the bonding resonance in the noninteracting limit survives but its position is shifted twice the coupling between the atoms in the molecule in the infinite $U$ limit and its linewidth is reduced to half. We attribute this behaviour to the unavailability of one of the transmission channels due to Coulomb blockade.
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