arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0909.3161cond-mat.mes-hall
收藏

双量子点Aharonov-Bohm环中库仑修正的Fano干涉

Coulomb-modified Fano interference in a double quantum dot Aharonov-Bohm ring

Weijiang Gong, Xuefeng Xie, Guozhu Wei

摘要:

本文讨论了库仑作用下双量子点Aharonov-Bohm环中电子输运中Fano干涉的变化。研究发现,参考通道中量子点中的库仑相互作用可以显著地改变Fano干涉,包括Fano线型对称性的增加或减少,以及Fano线型的反转,这取决于适当的库仑相互作用强度.但非零库仑作用只导致两群Fano线型的出现。当两个量子点能级都可调时,库仑诱导的非共振沟道分裂导致Fano干涉的破坏;而当考虑共振沟道点内的多体效应时,电导谱可能出现两条模糊的Fano线型.有趣的是,在没有磁场的情况下,当不同电子相互作用强度使不同通道中的量子点的一对能级相同时,尽管量子点能级发生了调整,但相应的共振态仍保持真空状态。

英文摘要:

In this paper, the Coulomb-induced changes of Fano interference in electronic transport through a double quantum dot Aharonov-Bohm ring are discussed. It is found that the Coulomb interaction in the quantum dot in the reference channel can remarkably modify the Fano interference, including the increase or decrease of the symmetry of the Fano lineshape, as well as the inversion of the Fano lineshape, which is dependent on the appropriate strength of the Coulomb interaction. %But the nonzero Coulomb interaction %only leads to the emergence of two-group Fano lineshapes. When both the quantum dot levels are adjustable, the Coulomb-induced splitting of the nonresonant channel leads to the destruction of the Fano interference; whereas two blurry Fano lineshapes may appear in the conductance spectra when the many-body effect in the dot of the resonant channel is also considered. Interestingly, in the absence of magnetic field, when the different-strength electron interactions make one pair of levels of the dots in different channels the same, the corresponding resonant state keeps vacuum despite the adjustment of quantum dot levels.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑