点内电子-电子库仑作用会引起退相干么?

Do intradot electron-electron interactions induce dephasing?

利用一个开放的多端Aharonov-Bohm (AB)装置研究了存在点内库仑作用时, 电子通过量子点时的相干性. 作者发现点内库仑作用不会引起任何退相干效应, 即电子隧穿通过量子点是完全相干的. 另外, 作者还发现, 在两端AB装置中, 电导AB振荡的振幅非对称性来源于受限的结构和库仑作用两方面. 因此, 不能把振幅的非对称性和退相干过程联系起来.

We investigate the degree of coherence of electronic transport through a quantum dot (QD) in the presence of an intradot electron-electron interaction by using an open multi-terminal Aharonov-Bohm (AB) setup. We find that the intradot interaction does not induce any dephasing effect and the electron transport through the QD is fully coherent. We also observe that the asymmetric amplitude of the AB oscillation in the conductance through the two-terminal AB setup originates from the interplay between the confined structure and the electron-electron interaction. Thus, one can not associate a dephasing process with this asymmetric amplitude, as has been done in previous studies.