Fano antiresonance realized by Majorana bound states coupled to one quantum-dot system

Highlights: • We evaluate quantum transport through one mesoscopic circuit with its quantum dot coupled to MBSs. • The results show that when two MBSs co-couple to the dot, antiresonance effect takes place. • The antiresonance point is related to the inter-MBS coupling. • Once the dot-MBS coupling strengths are equal, the Fano effect can be observed. • These provide new information for understanding the MBS-contributed quantum transport. We evaluate the quantum transport through one mesoscopic circuit with its embedded quantum dot coupled to the Majorana bound states (MBSs) at the ends of one topological-superconductor nanowire. The calculation results show that when the MBSs co-couple to the dot, antiresonance effect has an opportunity to take place, and the antiresonance point is related to the inter-MBS coupling. Moreover, once the dot-MBS coupling strengths are equal to each other, the Fano effect takes place, manifested as the Fano lineshape in the transmission-function spectrum. The results in this work can provide new information for the understanding of the MBS-contributed quantum transport through quantum-dot systems.