We consider an experimentally feasible setup to demonstrate the existence and coherent dynamics of Majorana fermion. The transport setup consists of a quantum dot and a tunnel-coupled semiconductor nanowire which is anticipated to generate Majorana excitations under some conditions. For transport under finite bias voltage, we find that a subtraction of the source and drain currents can expose the essential feature of the Majorana fermion, including the zero-energy nature by gate-voltage modulating the dot level. Moreover, coherent oscillating dynamics of the Majorana fermion between the nanowire and the quantum dot is reflected in the shot noise via a spectral dip together with a pronounced zero-frequency noise enhancement effect. Important parameters, e.g. for the Majorana's mutual interaction and its coupling to the quantum dot, can be extracted out in experiment using the derived analytic results.
@article{arxiv.1205.0322,
title = {Probing the existence and dynamics of Majorana fermion via transport through a quantum dot},
author = {Yunshan Cao and Peiyue Wang and Gang Xiong and Xin-Qi Li},
journal= {arXiv preprint arXiv:1205.0322},
year = {2013}
}