Abstract
Abstract We investigate the quantum transport through a quantum dot coupled with a superconducting&#xD;(SC) nanowire. By elaborating the differential conductance and current noise spectrum, we focus on the distinct characteristics&#xD;of the topological Majorana bound states (MBSs) and &#xD; trivial Andereev bound states (ABSs) hosted in SC wire.&#xD;For MBSs with a topological quality factor $q=1$,&#xD;we observe the degenerate features&#xD;manifested as the zero-bias peak (ZBP) &#xD;in differential conductance and the Rabi dips degeneracy (RDD) in noise spectrum.&#xD;In contrast, for ABSs with $q<1$,&#xD;the splitting of these degenerate features &#xD;depends on the linewidth, arising from realistic measurement conditions.&#xD; Furthermore, we identify the critical quality factors &#xD;$q_{\rm c}$ and $q_{\s}$ associated with the emergences of ZBP and&#xD; RDD, respectively.&#xD;The value of $q_{\rm c}$ is temperature-dependent, and we &#xD;establish a suitable temperature window to ensure the visibility of single ZBP in the experiments. &#xD;Whereas, $q_{\rm c}$ depends on the coupling strength rather temperature.&#xD;Typical values for these quality factors are&#xD;approximately $q_{\rm c}\approx 0.93$ and $q_{\s}\approx 0.99$.&#xD;Our results suggest that &#xD;the degenerate Rabi spectrum signal &#xD; could serve as a hallmark for the presence of MBSs, &#xD; which goes beyond the scope of differential&#xD;conductance.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have